US Pat. No. 9,405,073

FIBER ASSEMBLY FOR FACET OPTICAL COUPLING

Acacia Communications, In...

1. An apparatus, comprising:
a photonic chip including a planar surface and a pillar on the planar surface;
a fiber v-groove block having a first v-groove, wherein the first v-groove is aligned with the pillar such that the pillar
is at least partially within the first v-groove; and

a rod disposed within the first v-groove between the pillar and the fiber v-groove block,
wherein the fiber v-groove block further comprises a second v-groove, and wherein the apparatus further comprises an optical
fiber disposed at least partially within the second v-groove.

US Pat. No. 10,042,128

SPACE SAVING OPTICAL FIBER CONNECTOR

Acacia Communications, In...

1. A compact optical fiber connector, comprising:a connector body comprising a first end configured to couple with a first optical fiber; and
a faceplate configured to be coupled to a second end of the connector body opposite the first end, wherein the faceplate defines an opening for a second optical fiber to pass through the faceplate;
wherein the second end of the connector body defines an interior volume configured to receive a flange that extends radially outward from a longitudinal axis of the second optical fiber when the faceplate is at least partially detached from the second end of the connector body to receive the flange, the flange comprising one or more spring tabs configured to push against an interior surface of the faceplate when the faceplate is re-attached to the second end of the connector body, thereby biasing the flange against an interior surface of the second end of the connector body.

US Pat. No. 9,557,478

ELECTRONIC AND OPTICAL CO-PACKAGING OF COHERENT TRANSCEIVER

Acacia Communications, In...

1. A co-packaged electronic and optical apparatus comprising:
a package substrate body;
a chip comprising a driver and/or transimpedance amplifier (TIA), the chip being attached to the package substrate body;
an application specific integrated circuit (ASIC) attached to and in electrical communication with the chip;
a photonic integrated circuit (PIC) adjacent to and in electrical communication with the chip, the PIC having a surface;
a single-piece mast positioned adjacent to the PIC; and
an optical fiber coiled around the single-piece mast and having an end terminating substantially perpendicularly on the surface
of the PIC.

US Pat. No. 9,372,381

ROBUST MODULATOR CIRCUITS USING LATERAL DOPING JUNCTIONS

Acacia Communications, In...

1. A Mach-Zehnder optical modulator comprising:
an input optical waveguide;
an output optical waveguide;
a first optical waveguide arm and a second optical waveguide arm each optically connecting the input optical waveguide to
the output optical waveguide; a plurality of pn junctions arranged in the first optical waveguide arm and the second optical
waveguide arm;

wherein the first optical waveguide arm includes a first portion of the plurality of pn junctions oriented in a first direction
and a second portion of the plurality of pn junctions oriented in a second direction that is different from the first direction,
and

wherein the second optical waveguide arm includes a third portion of the plurality of pn junctions oriented in the first direction
and a fourth portion of the plurality of pn junctions oriented in the second direction.

US Pat. No. 10,088,733

SEGMENTED TRAVELING WAVE OPTICAL MODULATORS AND RELATED METHODS

Acacia Communications, In...

1. A traveling wave optical modulator comprising:tandem optical and radio frequency (RF) paths, the optical path having a first length and a second length and being configured to support an optical signal and the RF path being a segmented RF path configured to support an RF signal and having a first RF segment substantially following a shape of the first length of the optical path and a second RF segment substantially following a shape of the second length of the optical path, wherein the first RF segment is configured to provide the RF signal to the second RF segment; and
an RF amplifier coupled to an input of the second RF segment.

US Pat. No. 9,154,253

OPTICAL COMPENSATION USING A SPACE DIVISION MULTIPLEXING ELECTRO-OPTIC RECEIVER

Acacia Communications, In...

1. A method of compensating an optical signal that has been transmitted through a turbulent medium comprising the steps of:
receiving through the effect of receiver optics, the optical signal that has been transmitted through the turbulent medium;
compensating for the turbulence by spatial-division-multiplexing the received optical signal using a photonic integrated circuit;
processing the spatial-division-multiplexed signal such that an effects of the turbulence is mitigated; and
recovering any data conveyed by the optical signal;
wherein said spatial division multiplexing is performed by the photonic integrated circuit through the effect of a circular
grating coupler;

wherein said circular grating coupler includes a plurality of concentric grooves and a plurality of radially oriented waveguides
disposed around the perimeter of the concentric grooves;

wherein each one of said radially oriented waveguides are positioned in a respective optical path including one or more phase
shifters for azimuthal control.

US Pat. No. 9,606,377

INTEGRATED BROADBAND OPTICAL ISOLATOR

Acacia Communications, In...

1. An apparatus comprising:
an optical isolator comprising:
a 1×N input optical coupler;
a N×1 output optical coupler; and
N optical waveguides optically connecting the 1×N input optical coupler to the N×1 output optical coupler, N being greater
than two,

wherein each of at least three of the N optical waveguides includes at least two phase modulators.

US Pat. No. 9,853,737

BIAS CONTROL OF NESTED MACH-ZEHNDER MODULATORS FOR THE GENERATION OF OPTICAL QAM SIGNALS

Acacia Communications, In...

1. A method for bias control of a nested Mach Zehnder optical modulator, the method comprising:
converging a control loop for biasing an I modulator of the nested Mach Zehnder optical modulator by applying a first value
of a first bias voltage to the I modulator such that an output of the nested Mach Zehnder optical modulator is at transmission
null;

converging a control loop for biasing a Q modulator of the nested Mach Zehnder optical modulator by applying a first value
of a second bias voltage to the Q modulator such that an output of the nested Mach Zehnder optical modulator is at transmission
null; and

converging a control loop for I-Q phase delay of the nested Mach Zehnder optical modulator by applying a phase delay bias
voltage such that an output of the nested Mach Zehnder optical modulator is at transmission null;

subsequent to converging the control loops for biasing the I and Q modulators and I-Q phase delay, offsetting the first bias
voltage from the first value of the first bias voltage and the second bias voltage from the first value of the second bias
voltage; and

dithering the phase delay bias voltage while measuring variation in a characteristic of the output of the nested Mach Zehnder
optical modulator.

US Pat. No. 9,529,156

CLADDING DEFINED TRANSMISSION GRATING

Acacia Communications, In...

1. A photonic structure, comprising:
a core region; and
a first optical grating adjacent to the core region, the first optical grating defined by a plurality of disconnected pillars
of a first cladding material separated by at least one second material; and

a second optical grating formed in a second cladding material, the first and second optical gratings being disposed on a common
side of the core region such that the first optical grating is disposed between the second optical grating and the core region,
wherein the first and second cladding materials have an effective refractive index lower than an effective refractive index
of at least one layer in the core region.

US Pat. No. 10,133,142

SILICON MODULATORS AND RELATED APPARATUS AND METHODS

Acacia Communications, In...

1. A Mach Zehnder modulator comprising:a first waveguide arm having a first pn-junction formed therein;
a second waveguide arm having a second pn-junction formed therein;
a third waveguide arm having a third pn-junction formed therein, the third waveguide arm being coupled to the first waveguide arm via a first curved waveguide;
a fourth waveguide arm having a fourth pn-junction formed therein, the fourth waveguide arm being coupled to the second waveguide arm via a second curved waveguide;
an input waveguide coupled to both the first waveguide arm and second waveguide arm;
an output waveguide coupled to both the third waveguide arm and fourth waveguide arm;
driver circuitry configured to drive the first and the second pn-junctions with a first RF signal and the third and fourth pn-junctions with a second RF signal; and
a delay unit configured to delay the second RF signal with respect to the first RF signal.

US Pat. No. 9,671,628

SILICON ELECTRO-OPTICAL MODULATOR

Acacia Communications, In...

1. A silicon electro-optical modulator structure comprising:
a waveguide central core region including a depletion region;
adjacent to one side of the central core region is formed:
a P+ region formed adjacent to the depletion region;
a P? region formed adjacent to the P+ region;
a P++ region formed adjacent to the P? region; and
a P+++ region formed adjacent to the P++ region,
adjacent to the other side of the central core region is formed:
a N+ region formed adjacent to the depletion region;
a N? region formed adjacent to the N+ region;
a N++ region formed adjacent to the N? region; and
a N+++ region formed adjacent to the N++ region.

US Pat. No. 10,031,292

HORIZONTAL COUPLING TO SILICON WAVEGUIDES

Acacia Communications, In...

1. A method of forming a facet optical coupler comprising:forming a trench in a silicon substrate;
forming a first waveguide on an oxide layer overlying the silicon substrate in a region separate from the trench, wherein the first waveguide and the trench are non-overlapping;
filling the trench with a dielectric material; and
patterning a second waveguide on the dielectric material overlying at least part of the trench and at least part of the first waveguide.

US Pat. No. 9,523,820

ADIABATIC POLARIZATION ROTATION AND SPLITTING

Acacia Communications, In...

1. A photonic device comprising:
a first waveguide core having a length along which light propagation is supported, the first waveguide core being asymmetric
relative to a first imaginary plane that bisects a height of the first waveguide core and is parallel to a bottom surface
of the first waveguide core throughout a first region of the photonic device, wherein the first waveguide core is also asymmetric
relative to a second imaginary plane that is perpendicular to the first imaginary plane and bisects a width of the first waveguide
core; and

a second waveguide core, wherein a side surface of the second waveguide core is parallel to the first waveguide core throughout
the first region of the photonic device.

US Pat. No. 9,477,039

SLAB-MODE AND POLARIZATION CLEAN-UP IN SILICON PHOTONICS

Acacia Communications, In...

1. A rib waveguide structure comprising:
a slab waveguide; and
a rib formed upon a top surface of the slab waveguide, wherein the rib is configured to support a TE0 mode of light,
wherein the slab waveguide includes a first doped region and a second doped region not contacting the rib,
wherein the first doped region and the second doped region are spaced from the rib such that the rib waveguide structure is
fully transparent to the TE0 mode of light, and
wherein the first doped region and the second doped region are spaced from the rib such that the rib waveguide structure is
absorptive of a TM0 mode of light.

US Pat. No. 10,201,026

FORWARD ERROR CORRECTION SYSTEMS AND METHODS

Acacia Communications, In...

9. A method for performing forward error correction of data to be transmitted over an optical communications channel, the method comprising:receiving data bits;
organizing the data bits into an arrangement having a plurality of blocks organized into rows and columns, the plurality of blocks further organized into a plurality of strands of blocks including a first strand of blocks, the first strand of blocks comprising:
a back portion comprising a first row of the plurality of blocks, and
a front portion comprising blocks from at least two different columns in at least two different rows other than the first row of blocks; and
encoding at least some of the data bits in the arrangement using a first error correcting code at least in part by:
accessing first data bits in the front portion of the first strand of blocks;
accessing second data bits in the back portion of the first strand of blocks; and
generating first parity bits by applying the first error correcting code to the first data bits and the second data bits.

US Pat. No. 9,559,487

INTEGRATED HIGH-POWER TUNABLE LASER WITH ADJUSTABLE OUTPUTS

Acacia Communications, In...

1. A laser having a laser cavity comprising:
a first reflector at a first end of the laser cavity;
an intracavity N×M coupler arranged to receive light from the first reflector at a first port and distribute the light to
N output ports, where N and M are both greater than 1;

Q optical amplifiers arranged to amplify light from at least some of the N output ports to produce amplified light, where
Q?2; and

at least one second reflector arranged to reflect the amplified light back to the N×M coupler, wherein the first reflector
is located on a first photonic integrated circuit chip that includes a coherent optical receiver and an optical modulator
arranged to receive power from the laser and the at least one second reflector is located on a second chip.

US Pat. No. 9,195,079

THREE PORT TRANSCEIVER

Acacia Communications, In...

1. An optical coherent transceiver comprising a monolithically integrated electrical and optical circuit having a substrate
with a planar surface onto which is formed a polarization and phase-diversity coherent receiver and a polarization and phase-diversity
modulator, and said optical coherent transceiver including only three optical Input/Output ports employing only three grating
couplers, the first grating coupler optically connected to the polarization-diversity receiver, the second grating coupler
optically connected to the receiver and the input of the polarization-diversity modulator, and the third grating coupler optically
connected to the output of said modulator;
wherein one of the grating couplers couples in to the transceiver a modulated signal, a second one of the grating couplers
couples in to the transceiver a continuous-wave signal, and a third one of the grating couplers couples out a modulated signal.

US Pat. No. 9,922,887

WAFER-SCALE TESTING OF PHOTONIC INTEGRATED CIRCUITS USING HORIZONTAL SPOT-SIZE CONVERTERS

Acacia Communications, In...

1. A method, comprising:
obtaining a wafer comprising a plurality of photonic integrated circuits wherein a first photonic integrated circuit of the
plurality of photonic integrated circuits comprises a test circuit and a second photonic integrated circuit of the plurality
of photonic integrated circuits comprises a horizontal spot-size converter;

coupling light to the test circuit using a grating coupler disposed on a surface of the first photonic integrated circuit,
wherein the light is out-of-plane with respect to the surface; and

operating the test circuit to test the second photonic integrated circuit via the horizontal spot-size converter.

US Pat. No. 9,847,833

OPTICAL SIGNAL-TO-NOISE RATIO (OSNR) MONITORING AND MEASUREMENT IN OPTICAL COMMUNICATIONS SYTEMS

Acacia Communications, In...

1. A method, performed by an optical receiver coupled to an optical link, for measuring an optical signal-to-noise ratio (OSNR)
of the optical link, the method comprising:
receiving, during a first contiguous period of time, an information-carrying signal comprising a modulated signal generated
by an optical transmitter coupled to the optical link;

after receiving the information-carrying signal during the first period of time, receiving a noise signal during a second
contiguous period of time that does not overlap with the first contiguous period of time, wherein instantaneous signal power
of the optical transmitter is zero during the second contiguous period of time and wherein the second contiguous period of
time is shorter than a nanosecond;

determining, from the information-carrying signal obtained during the first contiguous period of time, a measure of power
of the information-carrying signal;

determining, from the noise signal obtained during the second contiguous period of time and without using the information-carrying
signal obtained during the first contiguous period of time, a measure of power of the noise signal; and

determining the OSNR of the optical link using the measure of power of the information-carrying signal and the measure of
power of the noise signal.

US Pat. No. 9,768,884

MULTI-RANGE FREQUENCY-DOMAIN COMPENSATION OF CHROMATIC DISPERSION

Acacia Communications, In...

1. A method of operating circuitry for compensation of chromatic dispersion, comprising:
receiving an optical signal through an optical fiber;
obtaining, from the optical signal, a first time-domain block, the first time-domain block having a first duration;
obtaining, from the optical signal, a second time-domain block, the second time-domain block having a second duration, wherein
the second time-domain block overlaps the first time-domain block in a time domain by a third duration that is less than the
first duration and the second duration;

dynamically adjusting an overlap duration of time-domain blocks obtained from the optical signal subsequent to the first and
second time-domain blocks based on a value indicative of a chromatic dispersion of the optical fiber, and then obtaining a
third time-domain block and a fourth time-domain block having a fourth duration of overlap different than the third duration,
the third and fourth time-domain blocks representing data obtained from the optical signal after the first and second time-domain
blocks;

obtaining a first frequency-domain block from the first time domain-block and a second frequency-domain block from the second
time-domain block;

multiplying the first frequency-domain block by a first frequency-domain filter coefficient to generate a first multiplication
result and multiplying the second frequency-domain block by a second frequency-domain filter coefficient to generate a second
multiplication result;

inverse Fourier-transforming the first multiplication result and the second multiplication result; and
setting the circuitry to a power-saving state during the third duration.

US Pat. No. 9,664,853

LOW-LOSS WAVEGUIDE TRANSITION

Acacia Communications, In...

1. A waveguide device comprising:
a first waveguide with a first height;
a second waveguide with a second height different from the first height; and
a transition region between the first waveguide and the second waveguide, the transition region comprising a first asymmetrical
taper of the first waveguide, the first asymmetrical taper being formed from a single edge extending between opposed first
and second sides of the first waveguide;

wherein the second waveguide has a second asymmetrical taper, the second asymmetrical taper having an edge that is co-linear
with and parallel to the first side of the first waveguide.

US Pat. No. 9,625,746

SILICON DEPLETION MODULATORS WITH ENHANCED SLAB DOPING

Acacia Communications, In...

1. A silicon carrier-depletion modulator, comprising:
a waveguide comprising a slab and a core, the core having a first height and including a first core region doped a first conductivity
type and a second core region doped a second conductivity type, the first conductivity type being opposite the second conductivity
type,

wherein the slab has a second height, different from the first height, and comprises a first slab region doped the first conductivity
type, a second slab region doped the first conductivity type, and a third slab region, and

wherein the second and third slab regions are between the first slab region and the first core region, the third slab region
is between the second slab region and the first core region, and wherein a first doping level of the first slab region is
greater than a second doping level of the second slab region, and the second doping level of the second slab region is greater
than a third doping level of the third slab region and a core doping level of the first core region.

US Pat. No. 10,009,106

SILICON PHOTONICS MULTICARRIER OPTICAL TRANSCEIVER

Acacia Communications, In...

1. A multicarrier coherent optical transceiver comprising:a silicon substrate;
an optical transmitter integrated on the silicon substrate and comprising a plurality of transmitter modulators;
an optical receiver integrated on the silicon substrate and comprising a plurality of photodetectors; and
a carrier generator comprising a signal modulator integrated on the silicon substrate and optically coupled to the optical transmitter and the optical receiver, the signal modulator being configured to receive as input an optical signal having an input carrier from an optical signal source and to generate, from the input carrier, a plurality of output carriers including a first output carrier and a second output carrier; and
a wavelength demultiplexer integrated on the silicon substrate, coupled to the carrier generator, and configured to spatially separate the plurality of output carriers;
wherein the plurality of transmitter modulators of the optical transmitter integrated on the silicon substrate includes a first transmitter modulator configured to receive the first output carrier and a second transmitter modulator configured to receive the second output carrier from the wavelength demultiplexer, and the plurality of photodetectors of the optical receiver includes a first photodetector configured to receive the first output carrier and a second photodetector configured to receive the second output carrier from the wavelength demultiplexer.

US Pat. No. 9,806,839

OPTICAL COMPENSATION USING A SPACE DIVISION MULTIPLEXING ELECTRO-OPTIC RECEIVER

Acacia Communications, In...

1. An optical communication system, comprising:
a photonic integrated circuit comprising:
an optical momentum separator comprising a grating coupler having a plurality of rings; and
an array of optical waveguides coupled to an outermost ring of the plurality of rings of the optical momentum separator's
grating coupler;

a digital circuit comprising a plurality of analog-to-digital converters, wherein at least two of the analog-to-digital converters
are coupled to respective waveguides of the array of waveguides; and

a compensation circuit comprising a plurality of signal equalizers comprising phase adjusters, wherein at least two of the
signal equalizers are coupled to outputs of respective analog-to-digital converters of the plurality of analog-to-digital
converters.

US Pat. No. 9,766,410

WAFER-LEVEL TESTING OF PHOTONIC INTEGRATED CIRCUITS WITH OPTICAL IOS

Acacia Communications, In...

1. An integrated device comprising:
a photonic integrated circuit including a M×N coupler within a plane of the integrated device;
at least one facet coupler positioned on an edge of the integrated device and configured to couple light between the photonic
integrated circuit and a first external optical component positioned proximate to the edge within the plane; and

at least one surface coupler positioned on a surface of the integrated device and configured to couple light between the photonic
integrated circuit and a second external optical component positioned proximate to the surface in a direction substantially
perpendicular to the plane, wherein the at least one surface coupler includes a first surface coupler coupled to an input
or an output of the M×N coupler.

US Pat. No. 9,435,959

COUPLING OF FIBER OPTICS TO PLANAR GRATING COUPLERS

Acacia Communications, In...

1. An apparatus comprising:
a groove assembly having a first surface having first and second grooves formed therein and a second surface substantially
opposite the first surface;

a first optical fiber disposed within the first groove of the groove assembly and a second optical fiber disposed within the
second groove of the groove assembly, the first optical fiber having a length defining an axis of propagation of light therein;
and

an optical integrated circuit having a first surface on which is disposed an optical grating coupler, the first surface of
the optical integrated circuit being proximate the second surface of the groove assembly and distal the first surface of the
groove assembly;

a section of coreless fiber mechanically connected to an end of the first optical fiber and disposed within the first groove;
a lens mechanically connected to the section of coreless fiber such that the section of coreless fiber is disposed between
the first optical fiber and the lens, and

an optical element mechanically connected to the lens and disposed such that the lens is between the first optical fiber and
the optical element the optical element being configured such that light traveling along the axis of propagation within the
first optical fiber is deviated toward the optical grating coupler, the optical element having an exit surface disposed between
the first surface of the optical integrated circuit and a bottom surface of the first groove of the groove assembly;

wherein the optical element is shared by the first optical fiber and the second optical fiber.

US Pat. No. 9,829,659

THROUGH TRANSMISSION PATH ON PHOTONIC CIRCUITS FOR OPTICAL ALIGNMENT

Acacia Communications, In...

1. A photonic integrated circuit comprising:
first, second, and third optical waveguides, the first and third optical waveguides having ends terminating proximate a common
edge of a substrate of the photonic integrated circuit, and the second optical waveguide comprising an optical impedance element;

a first tap coupler coupling the first optical waveguide to the second optical waveguide; and
a second tap coupler coupling the second optical waveguide to the third optical waveguide.

US Pat. No. 10,440,759

FORWARD ERROR CORRECTION SYSTEMS AND METHODS

Acacia Communications, In...

1. An apparatus for performing forward error correction of data to be transmitted over an optical communications channel, the apparatus comprising:an input interface;
a memory configured to store an arrangement;
a preprocessor comprising circuitry coupled to the input interface and configured to:
organize data bits received from the input interface into the arrangement, the arrangement having a plurality of blocks organized into rows and columns, the plurality of blocks further organized into a plurality of strands of blocks including a first strand of blocks, the first strand of blocks comprising:
a back portion comprising a first row of the plurality of blocks, and
a front portion comprising blocks from at least two different columns in at least two different rows other than the first row of blocks; and
an encoder comprising circuitry configured to encode at least some of the data bits in the arrangement using a first error correcting code at least in part by:
accessing first data bits in the front portion of the first strand of blocks;
accessing second data bits in the back portion of the first strand of blocks; and
generating first parity bits by applying the first error correcting code to the first data bits and the second data bits.

US Pat. No. 10,345,525

CANTILEVERS WITH ONE- OR TWO-DIMENSIONAL ACTUATION FOR ON-CHIP ACTIVE WAVEGUIDE COUPLING ALIGNMENT

Acacia Communications, In...

1. A photonic integrated circuit comprising:a substrate;
a cantilever having a proximal end connected to the substrate and a free end separated from the substrate by a recess; and
a first optical waveguide disposed, at least partially, within the cantilever;
wherein the cantilever comprises a cantilever biasing element configured to spatially bias the free end of the cantilever, wherein the free end of the cantilever is secured to an optical device with a material distinct from the cantilever and disposed between the first optical waveguide and a second optical waveguide of the optical device.

US Pat. No. 9,989,787

SILICON DEPLETION MODULATORS WITH ENHANCED SLAB DOPING

Acacia Communications, In...

1. A silicon carrier-depletion modulator, comprising:a waveguide comprising a core of a first height and a slab of a second height less than the first height, the core including a first core region doped to a core doping level of a first conductivity type and a second core region doped a second conductivity type opposite the first conductivity type,
wherein the slab includes a first slab region doped the first conductivity type, a second slab region doped the first conductivity type, and a third slab region, and
wherein the second and third slab regions are between the first slab region and the first core region, the third slab region is between the second slab region and the first core region, and wherein a first doping level of the first slab region is greater than a second doping level of the second slab region, and the second doping level of the second slab region is greater than a third doping level of the third slab region and the core doping level.

US Pat. No. 9,874,688

CO-PACKAGING PHOTONIC INTEGRATED CIRCUITS AND APPLICATION SPECIFIC INTEGRATED CIRCUITS

Acacia Communications, In...

1. A co-packaging arrangement comprising:
a photonic integrated circuit (PIC) and an application specific integrated circuit (ASIC) positioned beside the PIC, wherein
the PIC and the ASIC are disposed on a substrate within a housing;

wherein the PIC is edge-coupled to an optical fiber, and wherein the PIC comprises one or more optical modulators and one
or more optical detectors;

wherein the substrate comprises electrical interconnects configured to electrically connect the PIC to the ASIC; and
wherein the one or more optical modulators are driven directly from a digital-to-analog converter (DAC) that is located on
the ASIC.

US Pat. No. 9,823,496

MODULATION-BASED INTEGRATED BROADBAND OPTICAL ISOLATOR WITH IMPROVED ISOLATION

Acacia Communications, In...

1. An optical isolator comprising:
an input port coupled to a splitter;
an output port coupled to a combiner;
N optical paths connecting the splitter and the combiner and each including two radio-frequency (RF) phase modulators, where
N?2 and the N optical paths contain no optical couplers; and

a bypass optical path connecting the splitter and the combiner and lacking two active RF phase modulators.

US Pat. No. 9,494,748

THROUGH TRANSMISSION PATH ON PHOTONIC CIRCUITS FOR OPTICAL ALIGNMENT

Acacia Communications, In...

1. A photonic integrated circuit comprising:
a first optical waveguide and a second optical waveguide, the first optical waveguide having a first end adjacent a side of
the photonic integrated circuit and the second optical waveguide having a second end adjacent the side of the photonic integrated
circuit;

a first tap coupler coupled to the first waveguide;
a second tap coupler coupled to the second waveguide;
wherein the first tap coupler is coupled to the second tap coupler by a waveguide having an optical impedance element.

US Pat. No. 9,716,552

OTDM COHERENT TRANSCEIVER

Acacia Communications, In...

1. An optical time-division multiplexed (OTDM) coherent transceiver comprising:
an input waveguide;
an optical transmitter;
an optical receiver; and
a first optical splitter connected to the input waveguide and configured to divide a signal from the input waveguide to N
differential delay waveguides that are connected between the first optical splitter and N second optical splitters, wherein
the N differential delay waveguides provide differential delays corresponding to integer multiples of a symbol period of the
signal divided by N, and wherein the N second optical splitters are coupled to inputs of both the optical transmitter and
the optical receiver, a first N outputs from the N second optical splitters being optically connected to the optical receiver
and a second N outputs from the N second optical splitters being optically connected to the optical transmitter, the N second
optical splitters being between the first optical splitter and the optical transmitter, wherein the differential delays for
the first N outputs optically connected to the optical receiver and the differential delays for the second N outputs optically
connected to the optical transmitter are the same.

US Pat. No. 9,671,559

INTEGRATED POLARIZATION FILTER AND TAP COUPLER

Acacia Communications, In...

1. An optical apparatus comprising:
a first directional coupler having a first waveguide and a second waveguide;
a second directional coupler having a third waveguide and a fourth waveguide such that the third waveguide is optically connected
with the second waveguide of the first directional coupler;

a photodiode optically connected with an end of the third waveguide of the second directional coupler;
wherein the first directional coupler is configured to, in response to receiving an input signal having a first polarization
and a second polarization, output onto the second waveguide a first optical mode having the first polarization and the second
polarization;

wherein the second directional coupler is configured to output a second optical mode having a majority of the first polarization
onto the third waveguide; and

wherein the third waveguide and the fourth waveguide are not optically coupled to the first waveguide.

US Pat. No. 9,939,666

SILICON ELECTRO-OPTICAL MODULATOR

Acacia Communications, In...

1. A silicon electro-optical modulator structure comprising:a waveguide central core region including a depletion region;
adjacent to one side of the central core region is formed:
a P+ region formed adjacent to the depletion region;
a P? region formed adjacent to the P+ region;
a P++ region formed adjacent to the P? region; and
a P+++ region formed adjacent to the P++ region,
adjacent to the other side of the central core region is formed:
a N+ region formed adjacent to the depletion region;
a N? region formed adjacent to the N+ region;
a N++ region formed adjacent to the N? region; and
a N+++ region formed adjacent to the N++ region.

US Pat. No. 9,817,249

ALTERNATING TRAVELING-WAVE MACH-ZEHNDER MODULATOR

Acacia Communications, In...

1. A method of driving a Mach-Zehnder modulator comprising:
driving a first pn-junction of a first pair of pn-junctions and a first pn-junction of a second pair of pn-junctions with
a first alternating current (AC) signal; and

driving a second pn-junction of the first pair of pn-junctions and a second pn-junction of the second pair of pn-junctions
with a second alternating current (AC) signal;

wherein the first pn-junction of the first pair of pn-junctions and the first pn-junction of the second pair of pn-junctions
are disposed in a first waveguide arm of the Mach-Zehnder modulator, and the second pn-junction of the first pair of pn-junctions
and the second pn-junction of the second pair of pn-junctions are disposed in a second waveguide arm of the Mach-Zehnder modulator;
and

wherein the first pn-junction of the first pair of pn-junctions and the second pn-junction of the first pair of pn-junctions
are offset with respect to each other along a direction from an input to an output of the Mach-Zehnder modulator, and wherein
the first and second pn-junctions of the first pair of pn-junctions share an equal order of appearance of pn-junctions in
the first waveguide arm and the second waveguide arm, respectively, along the direction from the input to the output.

US Pat. No. 9,726,840

INTEGRATION OF ELECTRONIC CHIPS ONTO A PHOTONIC CHIP

Acacia Communications, In...

1. A method of integrating an electronic chip onto a photonic chip comprising:
recessing a window into a surface of the photonic chip, said window exhibiting a size and a thickness matching the electronic
chip;

positioning the electronic chip into the window such that a top surface of the electronic chip is substantially coplanar with
a top surface of the photonic chip; and

electrically connecting and mechanically securing the electronic chip to the photonic chip.

US Pat. No. 10,203,453

FACET OPTICAL COUPLER

Acacia Communications, In...

1. A facet optical coupler comprising:a substrate having opposing first and second two-dimensional edges;
an undercut region in the substrate, the undercut region being proximate to and offset from the first two-dimensional edge of the substrate and being distal from the second two-dimensional edge of the substrate;
a waveguide having an end over the undercut region; and
a substantially solid layer of second material configured to optically couple an edge of the substantially solid layer of second material with the waveguide, wherein the edge of the substantially solid layer of second material is aligned with the first two-dimensional edge, the substantially solid layer of second material extending continuously over the undercut region between the end of the waveguide and the first two-dimensional edge,
wherein the undercut region is closer to the first two-dimensional edge than is the end of the waveguide.

US Pat. No. 10,097,271

MULTICHANNEL COHERENT TRANSCEIVER AND RELATED APPARATUS AND METHODS

Acacia Communications, In...

1. A multi-channel coherent transceiver, comprising:a first package;
a multi-core application specific integrated circuit (ASIC) disposed within the first package;
a multi-channel transmitter or receiver photonic integrated circuit (PIC) disposed within the first package and coupled to the multi-core ASIC;
a second package comprising a tunable laser array; and
an optical fiber array comprising multiple optical fibers coupling the first package with the second package.

US Pat. No. 9,977,269

SILICON ELECTRO-OPTICAL MODULATOR

Acacia Communications, In...

1. An electro-optical modulator, comprising:a semiconductor material waveguide having four doped regions of a same dopant type but different doping concentrations, wherein
the four doped regions include first, second, third, and fourth doped regions, wherein the first doped region is closest to a center of the semiconductor material waveguide compared to the second and third doped regions, the second doped region is laterally between the first and third doped regions, and the fourth doped region is laterally adjacent to the third doped region such that the third doped region is between the second and fourth doped regions, wherein the third doped region has a greater doping concentration than the first doped region and the first doped region has a greater doping concentration than the second doped region, and wherein the fourth doped region has a greater doping concentration than the third doped region.

US Pat. No. 10,284,300

MONOLITHIC SILICON COHERENT TRANSCEIVER WITH INTEGRATED LASER AND GAIN ELEMENTS

Acacia Communications, In...

1. An apparatus, comprising:a substrate having a first waveguide, at least one photodetector, at least one modulator and a recess formed in the substrate, wherein the first waveguide is optically coupled to the at least one photodetector and to the at least one modulator;
a chip having a second waveguide, a spot size converter, a first facet and a second facet;
wherein a portion of the first facet of the chip aligned with an end of the second waveguide is covered with a reflective coating;
wherein the chip is positioned in the recess such that the first waveguide is optically coupled to the second waveguide by the spot size converter and through the second facet of the chip.

US Pat. No. 10,209,539

SUBSTRATE CAVITY

Acacia Communications, In...

1. A method comprising:creating a set of cavities in a substrate; wherein the substrate has a set of conductive elements arranged to electrically couple with a set of conductive elements of a photonic integrated circuit (PIC); wherein upon electrically coupling the PIC above the substrate each of the set of cavities are located proximately below each of a set of one or more TOPS in the photonic integrated circuit (PIC); wherein when exposed to an underfill, the ratio of a distance between the PIC and a depth of each cavity of the set of cavities in the substrate results in a surface tension in the underfill causing the underfill to flow around each cavity of the set of cavities in the substrate avoiding each TOPS of one or more TOPS in the PIC resulting in a cavity without underfill below each TOPS of the set of TOPS of the PIC.

US Pat. No. 9,628,186

ADVANCED OPTICAL MODULATION GENERATION BY COMBINING ORTHOGONAL POLARIZED OPTICAL SIGNALS

Acacia Communications, In...

1. An optical modulator comprising:
a Mach-Zehnder interferometer (MZI) structure including a tunable splitter arranged to split input light into two modulator
arms of the MZI;

a polarization combiner arranged to combine light from the two modulator arms into an output signal, wherein the two modulator
arms connect the tunable splitter to the polarization combiner;

an on-off keying (OOK) modulator positioned in a first arm of the two modulator arms; and
a single-polarization, four-level, pulse-amplitude (PAM-4) modulator and a polarization rotator positioned in a second arm
of the two modulator arms, wherein the tunable splitter is configured such that 4/7 of the input light is directed into the first arm and 3/7 of the input light is directed into the second arm for modulating the input light according to eight-level pulse-amplitude
modulation (PAM-8) format.

US Pat. No. 10,241,268

FILLING A CAVITY THROUGH A RESERVOIR AND A FEED-CHANNEL AND RELATED APPARATUS AND METHODS

Acacia Communications, In...

1. An optical device, comprising:a substrate;
a first optical component suspended above a first cavity in the substrate;
a second optical component suspended above a second cavity in the substrate;
a reservoir in the substrate;
a channel of smaller cross-section than the reservoir connecting the reservoir with the first and second cavities; and
a cured filler material disposed in both the first and second cavities and in contact with the first and second optical components.

US Pat. No. 10,305,590

OPTICAL SIGNAL-TO-NOISE RATIO (OSNR) MONITORING AND MEASUREMENT IN OPTICAL COMMUNICATIONS SYSTEMS

Acacia Communications, In...

1. An optical receiver coupled to an optical link, the optical receiver comprising:circuitry configured to determine an optical signal to noise ratio (OSNR) of the optical link at least in part by:
receiving, during a first receive time period related to a first transmit time period, a first signal comprising an information-carrying signal transmitted during the first transmit time period;
after receiving the first signal during the first receive time period, receiving a second signal comprising a noise signal during a second receive time period shorter than a nanosecond and non-overlapping with the first receive time period, the second receive time period related to a second transmit time period different from the first transmit time period, wherein transmitted instantaneous information-carrying signal power is zero during the second transmit time period;
determining, using at least the first signal received during the first receive time period, a measure of power of the information-carrying signal;
determining, using at least the second signal received during the second receive time period and without using the first signal received during the first receive time period, a measure of power of the noise signal; and
determining the OSNR of the optical link using the measure of power of the information-carrying signal and the measure of power of the noise signal.

US Pat. No. 10,168,476

CLADDING DEFINED TRANSMISSION GRATING

Acacia Communications, In...

1. A multi-layer photonic structure, comprising:a silicon waveguide core;
an optical grating adjacent to the silicon waveguide core, the optical grating defined by a plurality of disconnected pillars of a silicon cladding material arranged in a first layer of the multi-layer photonic structure; and
separators separating the plurality of disconnected pillars of the silicon cladding material,
wherein the silicon waveguide core has a core region of uniform thickness aligned with the optical grating, the core region being disposed in a second layer of the multi-layer photonic structure that is out of plane from the first layer.

US Pat. No. 9,703,038

FACET OPTICAL COUPLER

Acacia Communications, In...

21. A facet optical coupler comprising:
a silicon substrate having a facet coupling edge;
a layer of second material disposed on the silicon substrate and in contact with the silicon substrate at the facet coupling
edge;

an undercut region disposed between a portion of the silicon substrate and the layer of second material and offset from the
facet coupling edge; and

a waveguide embedded within the layer of second material, wherein the waveguide has an end proximate to the facet coupling
edge, and the end is positioned over the undercut region such that the waveguide only partially extends across the undercut
region,

wherein the undercut region is closer to the facet coupling edge than the waveguide.

US Pat. No. 10,326,530

BIAS CONTROL OF NESTED MACH-ZEHNDER MODULATORS FOR THE GENERATION OF OPTICAL QAM SIGNALS

Acacia Communications, In...

1. A method for bias control of a nested Mach Zehnder optical modulator, the method comprising:converging a control loop for biasing an I inner modulator of the nested Mach Zehnder optical modulator by applying a first value of a first bias voltage to the I inner modulator such that the I inner modulator is biased at a transmission null;
converging a control loop for biasing a Q inner modulator of the nested Mach Zehnder optical modulator by applying a first value of a second bias voltage to the Q inner modulator such that the Q inner modulator is biased at a transmission null; and
converging a control loop for I-Q phase delay of the nested Mach Zehnder optical modulator by applying a phase delay bias voltage such that a phase delay between an output of the I inner modulator and an output of the Q inner modulator is approximately ?/2+k·?, wherein k is an integer;
subsequent to converging the control loops for biasing the I and Q inner modulators and I-Q phase delay, offsetting the first bias voltage from the first value of the first bias voltage and the second bias voltage from the first value of the second bias voltage; and
dithering the phase delay bias voltage while measuring variation in a characteristic of the output of the nested Mach Zehnder optical modulator.

US Pat. No. 10,295,750

HORIZONTAL COUPLING TO SILICON WAVEGUIDES

Acacia Communications, In...

1. A method of forming a facet optical coupler comprising:forming a trench in a silicon substrate;
forming a first waveguide on an oxide layer overlying the silicon substrate in a region separate from the trench, wherein the first waveguide and the trench are non-overlapping;
filling the trench with a dielectric material; and
patterning a second waveguide on the dielectric material overlying at least part of the trench and positioned to optically couple with the first waveguide.

US Pat. No. 10,394,058

ADVANCED OPTICAL MODULATION GENERATION BY COMBINING ORTHOGONAL POLARIZED OPTICAL SIGNALS VIA LASER WITH DUAL OUTPUT PORTS

Acacia Communications, In...

1. An optical modulator system comprising:a laser with a laser cavity, the laser cavity having a first output port connecting to a first arm of an optical modulator and a second output port connecting to a second arm of the optical modulator; and
a combiner having a first input port optically connected to the first arm of the optical modulator and a second input port optically connected to the arm of the optical modulator; wherein the combiner is configured to combine the first optical signal and second optical signal into an output signal.

US Pat. No. 10,326,634

MODULATION SYSTEMS AND METHODS IN OPTICAL TRANSCEIVERS

Acacia Communications, In...

1. An optical transmitter, comprising:a modulator configured to:
receive a plurality of bits;
associate the plurality of bits with a plurality of symbols using a scaled set-partitioning quadrature amplitude modulation (SP-QAM) constellation, the SP-QAM constellation comprising a set of points arranged along a first direction and a second direction orthogonal to the first direction, the set of points including:
a first point having a same location as a corresponding first point in an unscaled SP-QAM constellation, and
a second point spaced a first distance away from the first point along the first direction, the second point having a non-zero offset relative to a corresponding point in the unscaled SP-QAM constellation; and
transmit the plurality of symbols.

US Pat. No. 10,268,055

SUBSTRATE CAVITY

Acacia Communications, In...

1. A method comprising:an underfill;
creating a set of cavities in a substrate; wherein the substrate has a set of conductive elements arranged to electrically couple with a set of conductive elements of a photonic integrated circuit (PIC); wherein upon electrically coupling the PIC above the substrate each of the set of cavities are located proximately below each of a set of one or more TOPS in the photonic integrated circuit (PIC); wherein each cavity of the set of cavities when coupled to the PIC creates a surface tension when exposed to the underfill to cause the underfill to flow around each cavity.

US Pat. No. 10,468,851

INTEGRATED HIGH-POWER TUNABLE LASER WITH ADJUSTABLE OUTPUTS

Acacia Communications, In...

1. An optical receiving system comprising:an N×M coupler of a laser formed in a first semiconductor layer on a first substrate;
a first set of optical paths coupled to the N×M coupler, wherein N and M are nonzero integers and N is greater than or equal to 2; wherein the first set of optical paths are formed in the first semiconductor layer on the first substrate;
phase shifters for one or more of the N input ports of the N×M coupler; wherein the phase shifters are formed on the first semiconductor layer; wherein the phase shifters are coupled to at least two optical paths of the first set of optical paths;
a second layer of semiconductor material on the first substrate;
a second set of optical paths;
optical amplifiers coupled; wherein at least two of the optical amplifiers are coupled to a respective at least two optical paths of the first set or second set of optical paths;
a first cavity reflector of the laser formed on the first substrate that is formed of a first semiconductor material;
at least one second cavity reflector formed on the first substrate that is formed of a second semiconductor material that is different from the first semiconductor material;
a plurality of optical paths within the laser extending between the first cavity reflector and the at least one second cavity reflector;
and
a coherent optical receiver formed on the first substrate and having an optical port connected to an output port from the laser.

US Pat. No. 10,389,448

SILICON PHOTONICS MULTICARRIER OPTICAL TRANSCEIVER

Acacia Communications, In...

1. An optical transceiver comprising:a silicon substrate;
first and second transmitter modulators integrated on the silicon substrate;
first and second photodetectors integrated on the silicon substrate;
a carrier generator configured to receive as input an optical signal having an input carrier from an optical signal source and to generate, from the input carrier, a plurality of output carriers including a first output carrier and a second output carrier; and
a basis former, coupled to the carrier generator, and having a first output port configured to provide the first output carrier to the first transmitter modulator and, separately, to the first photodetector and a second output port configured to provide the second output carrier to the second transmitter modulator and, separately, to the second photodetector.

US Pat. No. 10,536,219

MONOLITHIC SILICON COHERENT TRANSCEIVER WITH INTEGRATED LASER AND GAIN ELEMENTS

Acacia Communications, In...

1. An apparatus, comprising:a substrate having a first waveguide, at least one photodetector, at least one modulator and a recess formed in the substrate, wherein the first waveguide is optically coupled to the at least one photodetector and to the at least one modulator;
a chip having a second waveguide, a first facet and a second facet;
wherein a portion of the first facet of the chip aligned with an end of the second waveguide is covered with a reflective coating;
wherein the chip is positioned in the recess such that the first waveguide is optically coupled to the second waveguide through the second facet of the chip.

US Pat. No. 10,425,109

METHOD, APPARATUS, AND SYSTEM FOR DEINTERLEAVING DATA

Acacia Communications, In...

1. A method for deinterleaving data comprising:writing data into a buffer having 172,032 metrics arranged into an 84 by 8 array of 16 by 16 blocks; wherein the buffer is partitioned into 4 subsets of rows according to a predetermined write sequence;
applying a mapping table to change data in each of the 16 by 16 block of arrays according to a table; wherein the table specifies a mapping of the location for each metric in the 16 by 16 block; and
reading the data out of the buffer to serve as input for a first decoder and a second decoder.

US Pat. No. 10,263,385

WAVELENGTH LOCKER

Acacia Communications, In...

1. A method comprising:splitting a portion of light produced by a laser to a periodic wavelength filter;
measuring the phase in a period of the wavelength filter of the portion of the light;
calculating the frequency of the light using the measured phase;
comparing the wavelength of the light to a desired wavelength;
if the wavelength of the light does not match the desired wavelength, tuning the laser to match the desired wavelength;
wherein the measuring of the phase of the portion of light using the wavelength filter includes:
sending the portion of the light into a length imbalanced Mach-Zehnder interferometer with an optical 90-degree hybrid connected to two pairs of photodetectors; and
receiving from the two pairs of photodetectors an I signal and a Q signal in response to the light; and
wherein the measuring of the phase of the portion of light using the wavelength filter further includes:
calculating a wavelength of the light using according to the equation of:
where c0 is the speed of light in a vacuum, n(f) is the refractive index in the MZI as a function of frequency f, ?L is the path-length difference in the MZI, and m is an integer.

US Pat. No. 10,554,014

SHORTED P-N JUNCTION

Acacia Communications, In...

1. An apparatus comprising:an intra-cavity ring resonator with a p type semiconductor and an n type semiconductor; wherein the p type semiconductor and the n type semiconductor are connected via an electrical short from the p type semiconductor to the n type semiconductor; wherein an electrical path of the short is smaller than a free carrier lifetime.

US Pat. No. 10,425,154

FAULT LOCALIZATION AND FIBER SECURITY IN OPTICAL TRANSPONDERS

Acacia Communications, In...

13. A system, comprising:a first coherent optical transceiver;
a second coherent optical transceiver communicatively coupled to the first coherent optical transceiver via an optical transmission link; and
a processor configured to:
determine a first propagation delay between the first coherent optical transceiver and the second coherent optical transceiver across the optical transmission link;
after determining the first propagation delay, determine a second propagation delay between the first coherent optical transceiver and the second coherent optical transceiver across the optical transmission link;
determine whether a comparison of the second propagation delay and the first propagation delay indicates that a change amount between the second propagation delay and the first propagation delay exceeds a threshold change amount; and
when it is determined that the comparison of the second propagation delay and the first propagation delay indicates that the change amount between the second propagation delay and the first propagation delay exceeds the threshold change amount, provide an indication to a user that an insertion has been made into the optical transmission link.

US Pat. No. 10,798,756

FORWARD ERROR CORRECTION SYSTEMS AND METHODS

Acacia Communications, In...

8. A method for performing forward error correction of data to be transmitted over an optical communications channel, the method comprising:encoding an arrangement of data bits; the arrangement having rows of blocks including a first row of blocks; wherein each block of the arrangement is enabled to store a plurality of bits; the encoding of the arrangement including:
generating parity bits by applying a first error correcting code to at least some of a first set of data bits in blocks of the first row; and applying the first error correcting code to at least some of a second set of data bits; wherein the second set of data bits is located in a set of blocks; wherein each block of the set of blocks is in a different row than the first row; wherein each respective block of the set of blocks is in a different column and a different row than each other block of the set of blocks; and
storing the generated parity bits in the first row of blocks.

US Pat. No. 10,571,633

SUSPENDED CANTILEVER WAVEGUIDE

Acacia Communications, In...

1. An optical facet coupler, comprising:a substrate having an air cavity;
a waveguide layer disposed on the substrate and including a waveguide disposed above the air cavity and a plurality of support beams suspending the waveguide; and
a sealant configured to seal a topside of the air cavity and in contact with a top surface of the waveguide.

US Pat. No. 10,567,209

GEOMETRICALLY SHAPING QAM MODULATION

Acacia Communications, In...

1. A method for encoding a data for transmission across a communication link, the method comprising:encoding the data into a constellation; wherein the constellation is of a power 2n; wherein n is an odd number; wherein encoding the constellation creates outer constellation points forming a square at an edge of the constellation; wherein a beta of the constellation is optimized to increase distance between at least some of the constellation points.

US Pat. No. 10,416,380

SUSPENDED PHOTONIC WAVEGUIDES WITH TOP SIDE SEALING

Acacia Communications, In...

1. An apparatus comprising:a photonic structure suspended over a silicon substrate;
a sealed cavity positioned between the silicon substrate and the photonic structure, wherein the sealed cavity is bounded at least in part by the silicon substrate; and
at least one region of dielectric material formed to seal the cavity, wherein the at least one region of dielectric material overlaps with the sealed cavity within a layer that includes the photonic structure.

US Pat. No. 10,637,578

ENCODING A FIRST MODULATION TYPE WITH A FIRST SPECTRAL EFFICIENCY INTO A SECOND MODULATION TYPE CAPABLE OF HAVING A SECOND SPECTRAL EFFICIENCY

Acacia Communications, In...

1. A method comprising:modifying a higher order modulation format to operate at an efficiency of a lower order modulation format by mapping a first encoding signal order into a second encoding signal order, wherein:
the first encoding signal order uses a first modulation scheme;
the second encoding signal order uses a second modulation scheme; and
the first modulation scheme uses fewer constellation points than the second modulation scheme.

US Pat. No. 10,535,571

WAFER-SCALE TESTING OF PHOTONIC INTEGRATED CIRCUITS USING HORIZONTAL SPOT-SIZE CONVERTERS

Acacia Communications, In...

1. An apparatus comprising:a wafer comprising a plurality of photonic integrated circuits;
a first photonic integrated circuit of the plurality of photonic integrated circuits comprising a test circuit;
a second photonic integrated circuit of the plurality of photonic integrated circuits adjacent the first photonic integrated circuit and comprising a horizontal spot-size converter, wherein the horizontal spot-size converter comprises an inverted taper;
wherein the test circuit is configured to test the second photonic integrated circuit via the horizontal spot-size converter.

US Pat. No. 10,488,683

TRAVELING WAVE MODULATOR

Acacia Communications, In...

1. An optical modulator comprising:an optical path having at least one optical waveguide; and
an impedance formed along the optical path, wherein the impedance comprises a capacitance per unit length that increases along the optical path.

US Pat. No. 10,714,894

CARRIER SWEEP-OUT IN A TUNABLE LASER

Acacia Communications, In...

1. An external cavity tunable laser, comprising:a silicon photonics circuit comprising one or more ring resonators having one or more p-i-n junctions; wherein a voltage is applied to one or more of the p-i-n junctions; wherein a reverse junction current is used to control power of the external cavity tunable laser using a control loop; wherein the reverse junction current serves as a feedback signal to enable the control loop to lock at least a ring resonator of the one or more ring resonators at a lasing wavelength.

US Pat. No. 10,488,682

DISTRIBUTED CMOS DRIVER WITH ENHANCED DRIVE VOLTAGE FOR SILICON OPTICAL PUSH-PULL MACH-ZEHNDER MODULATORS

Acacia Communications, In...

1. A silicon optical modulator driver comprising:driver circuitry configured to:
electrically drive, with a first driver, a first plurality of diodes with a first modulating signal, the first plurality of diodes disposed at differing locations on a first common optical waveguide arm of a Mach-Zehnder optical modulator;
electrically drive, with a second driver different than the first driver, a second plurality of diodes with a second modulating signal, the second plurality of diodes disposed at differing locations on a second common optical waveguide arm of the Mach-Zehnder optical modulator;
wherein at least a first diode of the first plurality of diodes is electrically connected in parallel to at least a second diode of the second plurality of diodes.

US Pat. No. 10,416,381

SPOT-SIZE-CONVERTER DESIGN FOR FACET OPTICAL COUPLING

Acacia Communications, In...

1. An optical facet coupler, comprising:a substrate having a trench;
a cladding material disposed in the trench;
a first waveguide disposed at least partially in the trench and on the cladding material; and
a second waveguide disposed at least partially outside the trench and optically coupled to the first waveguide,
wherein the first waveguide has a first width and the second waveguide has a second width smaller than the first width, and
wherein the first width is a largest width at a first cross section of the first waveguide, and the second width is a largest width at a second cross section of the second waveguide.

US Pat. No. 10,673,161

CONDUCTIVE CONNECTOR

Acacia Communications, In...

1. A system to increase current connectivity comprising:a phalanx head;
a connector, wherein the connector has a horizontal body and a hollow cylindrical portion extruding vertically from the body; wherein the cylindrical portion is made up of a set of pieces; wherein the cylindrical portion has an inner circumference; wherein at least a piece of the set of pieces is arranged to expand horizontally upon insertion of the phalanx head in a vertical manner; wherein at least a first portion of the phalanx head is smaller than the inner circumference of the cylindrical portion and at least a second portion of the phalanx head is larger than the inner circumference of the cylindrical portion; wherein the connector has a hollow threaded portion vertically aligned with the hollow cylindrical portion; and
a fastener with external threads sized to screw into the threaded portion of the connector.

US Pat. No. 10,222,566

OPTOELECTRONIC PACKAGE WITH PLUGGABLE FIBER ASSEMBLY

Acacia Communications, In...

1. An apparatus, comprising:a substrate including a trench;
a photonic integrated circuit (PIC) including an optical device, the PIC being disposed on a first surface portion of the substrate, wherein the PIC includes one or more optical ports located at an edge of the PIC;
a receptacle disposed in the trench of the substrate, wherein the receptacle includes a guide pin structure configured to receive a guide pin of a fiber assembly including a plurality of optical fibers, wherein the receptacle is aligned with the PIC such that the one or more optical ports are aligned to optically edge-couple, through the edge of the PIC, to the plurality of optical fibers in the fiber assembly when the guide pin of the fiber assembly is inserted into the guide pin structure of the receptacle; and
a support structure, wherein the receptacle is coupled to a second surface portion of the substrate via the support structure, the first and second surface portions being substantially co-planar.

US Pat. No. 10,505,676

SYSTEM, METHOD, AND APPARATUS FOR INTERLEAVING DATA

Acacia Communications, In...

1. A method for interleaving data to facilitate correction of burst errors occurring during transmission of data, the method comprising:creating a buffer having 172,032 bits arranged into an 84 by 8 array of 16 by 16 blocks; wherein the buffer is partitioned into 4 subsets of rows;
writing input data into each 16 by 16 block of arrays according to a table; wherein the table specifies the location of each bit in the 16 by 16 block based on the origin of the bit; and
reading output data out of the buffer in groups of 8 bits; wherein each of the groups of 8 bits are taken in turn from each subset, in a column by column ordering; wherein arrangement of the output data facilitates correction of burst errors occurring during transmission of the output data.

US Pat. No. 10,797,462

ER-DOPED WAVEGUIDE INTEGRATION IN SILICON PHOTONICS

Acacia Communications, In...

1. A photonic integrated circuit comprising:a base;
a first waveguide comprising a first material disposed on the base in a first plane, wherein the first waveguide is a silicon waveguide configured to provide a first optical signal;
a second waveguide comprising a second material disposed on the base in a second plane;
a third waveguide comprising a third material disposed on the base in a third plane, wherein the third waveguide is a waveguide amplifier;
a pump laser disposed on the base with a pump laser output, wherein the pump laser is configured to provide pump light at the pump laser output with a center wavelength between 880 nm and 1080 nm; and
a multiplexer disposed on the base with a first input coupled to the silicon waveguide, a second input coupled to the pump laser output and a multiplexer output coupled to the waveguide amplifier,
wherein the multiplexer is configured to provide at the multiplexer output a second optical signal based in part on a combination of the first optical signal and the pump light,
wherein the second plane is disposed in between the first plane and third plane; and
wherein the pump laser is configured to provide pump light to the second waveguide of the second material.

US Pat. No. 10,784,897

DEINTERLEAVER

Acacia Communications, In...

1. A method for deinterleaving data comprising:writing data into a buffer having a number of metrics, wherein a metric comprises at least two bits, arranged into an N by 8 array of 16 by 16 metric blocks, wherein N is an even number; wherein the buffer is partitioned into at least 2 subsets of rows according to a predetermined write sequence;
applying a mapping table to change data in each of the 16 by 16 metric block of arrays according to a table; wherein the table specifies a mapping of the location for each metric in the 16 by 16 metric block; and
reading the data out of the buffer to serve as input for a first decoder and a second decoder.

US Pat. No. 10,623,102

SILICON PHOTONICS MULTICARRIER OPTICAL TRANSCEIVER

Acacia Communications, In...

1. An optical transceiver comprising:a silicon substrate;
first and second transmitter modulators integrated on the silicon substrate;
first and second photodetectors integrated on the silicon substrate;
a carrier generator configured to receive as input an optical signal having an input carrier from an optical signal source and to generate, from the input carrier, a plurality of output carriers including a first output carrier and a second output carrier;
a first power splitter configured to provide the first output carrier to the first transmitter modulator and to the first photodetector; and
a second power splitter configured to provide the second output carrier to the second transmitter modulator and to the second photodetector.