Optical semiconductor apparatus, a method of driving the same an

Details Optical semiconductor apparatus, a method of driving the same an Optical semiconductor apparatus, a method of driving the same an

1993-01-29

1994-09-20

Davie, James W.

Coherent light generators

Particular active media

Semiconductor

372 26, 372 45, H01S 319

Patent

active

053495985

ABSTRACT:
An optical semiconductor apparatus includes at least two upper and lower light waveguides. The waveguides are formed in a direction of semiconductor layers layered on a substrate and have a predetermined coupling degree therebetween. At least one semiconductor laser and at least one photodetector are respectively arranged in any one of the light waveguides. A grating may be formed in or in the vicinity of any one of the light waveguides to attain a wavelength-sensitivity in the coupling between the upper and lower light waveguides. The coupling degree may be controlled by a voltage applied to a part of the waveguides. An incident light entering one of the waveguides can be coupled to a local oscillation light emitted from the semiconductor laser to generate a beat signal therebetween. The beat signal can be detected by the photodetector.

REFERENCES:
patent: 3902133 (1975-08-01), Watts
patent: 4837526 (1989-06-01), Suzuki et al.
patent: 5220573 (1993-06-01), Sakata et al.

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