Distributed feedback semiconductor laser device

Details Distributed feedback semiconductor laser device Distributed feedback semiconductor laser device

1988-01-04

1989-02-14

Sikes, William L.

Coherent light generators

Particular resonant cavity

Distributed feedback

372 50, H01S 308

Patent

active

048051837

ABSTRACT:
A distributed feedback semiconductor laser device with a resonator comprising a multi-layered optical waveguide that contains an optical guiding area with a periodic corrugation, the optical guiding area being composed of at least two regions, a first region I and a second region II, wherein both the periodicity of the corrugation and the depth of each concave portion of the corrugation of the first region I of the optical guiding area are the same as those of the second region II of the optical guiding area, and moreover the thickness of the first region I of the optical guiding area is the same as that of the second region II of the optical guiding area, so that the effective refractive index of the first region I in the resonator direction becomes the same as that of the second region II in the resonator direction and the Bragg wavelength is maintained at a fixed level in the the resonator direction; and there is a difference in their refractive index at the interface between the first and second regions of the optical guiding area, so that an effective optical-phase shift takes place without changing the Bragg wavelength in the resonator direction.

REFERENCES:
patent: 4045749 (1977-08-01), Burnham et al.
patent: 4096446 (1978-06-01), Haus et al.
patent: 4302729 (1981-11-01), Burnham et al.
patent: 4665528 (1987-05-01), Chinone et al.

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