Semiconductor optical modulator

Details Semiconductor optical modulator Semiconductor optical modulator

1996-08-19

1997-07-29

Ullah, Akm E.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

G02F 1035

Patent

active

056528078

ABSTRACT:
Disclosed is a semiconductor optical modulator which has: semiconductor input-light waveguide with an incidence end; a semiconductor Y-branch element for branching light from the semiconductor input-light waveguide into two equal lights; first and second semiconductor optical waveguides for propagating the two lights, respectively branched by the semiconductor Y-branch element; first and second electrodes provided on the first and second optical waveguides, respectively; a semiconductor optical coupling element for coupling the two lights passed through the first and second optical waveguides; and a semiconductor output-light waveguide for leading light coupled in the semiconductor optical coupling element to an emission end of the semiconductor output-light waveguide; wherein the semiconductor optical modulator is provided with a means for producing a phase difference of 180.degree. between the two lights input to the semiconductor optical coupling element when equal voltages are applied to the first and second electrodes.

REFERENCES:
patent: 5185830 (1993-02-01), Nishimoto
patent: 5283842 (1994-02-01), Hakogi et al.
patent: 5287421 (1994-02-01), Forrest et al.
patent: 5515196 (1996-05-01), Kitajima et al.
patent: 5528707 (1996-06-01), Sullivan et al.
patent: 5590143 (1996-12-01), Takara et al.
H. Sano et al., "InGaAs/InAlAs MQW Mach-Zehnder Optical Modulator for 10-Gbit/s Long-Haul Transmission Systems", Optical Fiber Communication Conference, OFC '92, p. 223.
C. Rolland et al., "10 Gb/s, 120 km Normal Fiber Transmission Experiment Using a 1.56 .mu.m Multiple . . . Modulator", Optical Fiber Communication Conference, OFC '93, PD27, 1993, pp. 111-114.

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