Patent ID: 7035517

Claim:
An integrated demultiplexer/photoreceiver for optical networks and optical interconnection devices intended for receiving, demultiplexing, and converting communication optical signals into electrical communication signals, said integrated demultiplexer/photoreceiver comprising: a common substrate of a semiconductor material; three basic components comprising a waveguide grating router which has waveguide portions and receives said communication optical signals, an array of individual photodetectors, and an array of individual heterojunction transistors located on said common substrate, said waveguide grating router, said array of photodetectors and said array of individual heterojunction transistors being arranged sequentially one after another; each of said waveguide grating router, said array of photodetectors, and said array of heterojunction transistors having identical layer structure that consists of at least a first doped basic layer, a second doped basic layer which has a portion transparent to said communication optical signals only in said waveguide grating router, and a third doped basic layer which is partially etched down to said second doped basic layer; said first doped basic layer in all said three basic components having the same chemical composition and the same doping and is located on said common substrate; said third doped basic layer having in all said three basic components having the same chemical composition and the same doping, said second doped basic layer being sandwiched between said first doped basic layer and said third doped basic layer.