Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1996-06-03
1997-12-30
Bovernick, Rodney B.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 50, H01S 308
Patent
active
057038996
ABSTRACT:
There is a phenomenon that, when an epitaxial growth is performed on an uneven surface, such as a periodical surface or grating surface, having surfaces with different surface indices, p- and n-type layer portions can be simultaneously formed depending on growth surface orientations if an impurity such as Si or group IV elements is used. In a gain-coupling distributed feedback laser of the present invention, that phenomenon is utilized, and a current restraint layer, which includes alternately-arranged p- and n-type layer portions, is formed in the vicinity of an active layer. Thus, current is unevenly injected into the active layer, and a periodical gain structure can be established. As a result, a distributed feedback structure is achieved, which performs a gain-coupling operation.
REFERENCES:
English translation of Japanese Patent Application Laid-Open, No. 6241978, Oct. 7, 1988, for "Distributed Feedback Semiconductor Laser", filed Mar. 27, 1987.
Nakano et al., "Facet Reflection Independent, Single Longitudinal Mode Oscillation in a GaAlAs/GaAs Distribution Feedback Laser Equipped with a Gain-Coupling Mechanism," App. Phys. Lett., 55:1606 Oct. (1989).
Luo et al., "Fabrication and Characteristics of Gain-Coupled Distribution Feedback Semiconductor Lasers with a Corrugated Active Layer," IEEE J. Quantum Elec., 27:1724 Jun. (1991).
Bovernick Rodney B.
Canon Kabushiki Kaisha
Wise Robert E.
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