1. An opto-electronic circuit for an Arrayed Waveguide Grating (AWG)-based Raman spectrometer for non-invasive optical glucose monitoring, the opto-electronic circuit comprising:an AWG, comprising:a substrate;
filled waveguide trenches on the substrate comprising an optical waveguide;
filled doped trenches on the substrate comprising a detector;
a laser source configured to shine light at human skin;
a prism configured to capture light scattered off the human skin when exposed to light from the laser source (detected light) and to direct the light toward the AWG;
a signal processing device coupled to the detector;
wherein the signal processing device is configured to determine a glucose level based on the output of the detector.