A photodetector comprises a waveguide layer to propagate lights, a clad layer which is laminated onto the waveguide layer and has a refractive index smaller than that of the waveguide layer, the clad layer having at least two portions having different thicknesses, and photoelectric converting devices...http://www.google.fr/patents/US5032710?utm_source=gb-gplus-shareBrevet US5032710 - Photodetector to detect a light in different wavelength regions through clad layer having different thickness portions
Photodetector to detect a light in different wavelength regions through clad ...
