Integrated thin film MSM photodetector/grating for WDM

摘要

An integrated optical signal wavelength demultiplexing device, which may simultaneously demultiplex and detect an optical signal, is discussed. The integrated device features a waveguide structure to carry an optical signal, a photodetector in close proximity to the waveguide structure, and a wavelength limiting grating structure integrated with the photodetector and coupling the waveguide structure to the photodetector. The grating structure is fabricated within the photodetector and is used to transmit only a selected wavelength onto the photodetector.