1. An optical waveguide structure, comprising:
a first waveguide layer having a taper portion, a connecting portion, and a strip portion, wherein the connecting portion
is disposed between the taper portion and the strip portion;
a second waveguide layer; and
a binding layer disposed between the first waveguide layer and the second waveguide layer;
wherein the first waveguide layer is configured to couple a light beam through the taper portion and the connecting portion
to the strip portion; and the taper portion has a length ranged from 20 to 30 microns and a width gradually broadened from
0.3 microns to 0.5 microns.