Patent ID: 6627868
Filing Date: 2003-09-30
Classification: B82Y,H01L

Abstract:
A bi-functional optical detector comprising:a first active photoconduction detection element configured to detect light within first and second wavelength ranges; a first diffraction grating associated with the first detection element and configured to couple the light within the first wavelength range so that the first active photoconducting detection element detects the light in the first wavelength range; a second active photoconduction detection element configured to detect light within the first and second wavelength ranges; a second diffraction grating associated with the second detection element and configured to couple the light within the second wavelength range so that the second active photoconduction detection element detects the light in the second wavelength range; a third active photoconduction detection element associated with the first detection element and configured to detect the light within the first and second wavelength ranges; a fourth active photoconduction detection element associated with the second detection element and configured to detect the light within the first and second wavelength ranges; and a common contact layer separating the first and second detection elements from the third and fourth detection elements.