Coherent light generators – Particular beam control device – Modulation
Patent
1997-07-31
1999-03-02
Davie, James W.
Coherent light generators
Particular beam control device
Modulation
45 46, 45 50, 45 96, H01S 310
Patent
active
058780661
ABSTRACT:
An optical semiconductor apparatus includes at least two semiconductor laser portions each having a light waveguide with an active layer and a distributed reflector, and a stimulating unit for independently stimulating the active layers of the light waveguides. The semiconductor laser portions are serially arranged in a light propagation direction. The light waveguides are constructed such that a difference between propagation constants for two different polarization modes in one of the waveguides is different from a difference between propagation constants for the two different polarization modes in the other of the waveguides. When one of injection of a modulation current signal into or application of a modulation voltage to the optical semiconductor apparatus, an oscillation state can be switched between a state in which Bragg wavelengths for one of the two different polarization modes coincide with each other between the light waveguides and a state in which Bragg wavelengths for the other of the two different polarization modes coincide with each other between the light waveguides.
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Furukawa Yukio
Mizutani Natsuhiko
Sakata Hajime
Canon Kabushiki Kaisha
Davie James W.
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