Patent ID: 8278741
Filing Date: 2012-10-02
Classification: G02B,H01L

Abstract:
1. A photonic device, comprising: a substrate semiconductor film with first and second trench sidewalls formed therein; a first photodetector including a first p-i-n film stack disposed over the first trench sidewall, wherein the first p-i-n film stack comprises a first i-layer semiconductor film having a band gap to absorb at least a portion of light incident to the first trench sidewall having a first wavelength and to pass at least a portion of the incident light having a second wavelength; a second photodetector including a second p-i-n film stack disposed over the second trench sidewall, wherein the second p-i-n film stack comprises a second i-layer semiconductor film having a band gap different than that of the first i-layer semiconductor film to absorb at least a portion of light having the second wavelength; and an optical waveguide formed in the substrate semiconductor film and spanning at least a portion of a distance between the first and the second photodetectors to optically couple to the second sidewall photodetector at least a portion of the incident light including the second wavelength passed by the first sidewall photodetector.