Integrated optical filter and photodetector and methods of fabricating the same

An optical system comprising:

• an optical receiver comprising:
• a waveguide configured to receive a multi-wavelength optical signal;
• an array of two or more integrated optical filter and photodetectors coupled to the waveguide, wherein a first integrated optical filter and photodetector is configured to filter a first wavelength of light from the multi-wavelength optical signal propagating through the waveguide and a second integrated optical filter and photodetector is configured to filter a second wavelength of light from the multi-wavelength optical signal propagating through the waveguide different from the first wavelength of light, and wherein each of the first and second integrated optical filter and photodetectors comprises:
• a substrate;
• an insulator layer on the substrate;
• a semiconductor layer on the insulator layer;
• an optical filter comprising a ring resonator having a resonant cavity formed in or on the semiconductor layer;
• a photodetector comprising a portion of the ring resonator and two first metal fingers and a second metal finger interdigitated between the two first metal fingers on the semiconductor layer forming Schottky barriers, wherein the first metal fingers and the second metal finger are disposed over the portion of the ring resonator and the first metal fingers are constructed from a different metal relative to the second metal finger.