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US 6,587,604 B2Granted
Optical semiconductor device
AssigneeFujitsu Quantum Devices Limited
InventorShohgo Yamauchi
Life of this patent
Estimating the term…
Abstract
An optical semiconductor device includes an optical modulator and an optical detector formed integrally on a common substrate to form an optical integrated circuit, wherein an optical beam spot conversion part is provided also integrally on the common substrate so as to connect an output end of the optical modulator and an input end of the optical detector.
Claims24
An optical semiconductor device, comprising:
- a substrate;
- an optical waveguide formed on said substrate, said optical waveguide constituting an interferometer-type optical modulator;
- an optical absorption layer formed on said substrate in optical coupling with said interferometer-type optical modulator, said optical absorption layer forming an optical detector;
- and
- an optical-spot conversion part interposed on said substrate between an output end of said optical waveguide and an input end of said optical absorption layer, said optical-spot conversion part converting a spot radius of an optical beam between said interferometer-type optical modulator and said optical detector,
- said optical absorption layer extends in continuation to said optical-spot conversion part, so that substantially entire optical beam in said optical waveguide is injected to said optical absorption layer via said optical-spot conversion part.
3 more elements
Dependencies are inferred from the claim text.