Patent ID: 6545801
Filing Date: 2003-04-08
Classification: H01S

Abstract:
A semiconductor optical amplifier, comprising:a substrate extending from a first end surface to a second end surface; a first cladding layer formed on said substrate with a first conductivity type; a plurality of active layers formed on said first cladding layer each having a bandgap smaller than a bandgap of said first cladding layer; at least one spacer layer interposed between said plurality of active layers and having a bandgap larger than said bandgap of said active layers; a second cladding layer formed on said substrate so as to cover said plurality of active layers and said at least one spacer layer; a first electrode injecting carriers to each of said plurality of active layers through said first cladding layer; and a second electrode injecting carriers to each of said plurality of active layers through said second cladding layer; each of said plurality of active layers accumulates a tensile strain therein.