Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1991-12-12
1993-05-04
Davie, James W.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 45, H01S 319
Patent
active
052088243
ABSTRACT:
DFB lasers with advantageously structured grating region are disclosed. The grating region comprises one or more thin semiconductor layers (to be referred to as "QWs"), with the QWs varying periodically in the longitudinal direction of the laser. In an exemplary preferred embodiment the AWs are patterned during grating etch, with the topmost grating QW being covered with a layer of substantially the substrate composition. The structure inter alia facilitates defect-free epitaxial growth on the corrugated etched surface and also facilitates growth of the coupling coefficient .kappa.. Furthermore, lasers according to the invention can be partially or purely gain coupled, resulting in desirable wavelength discrimination.
REFERENCES:
patent: 5077752 (1991-12-01), Tada et al.
"Coupled-Wave Theory of Distributed Feedback Lasers", by H. Kogelnik et al, Journal of Applied Physics, vol. 43, No. 5, May 1972, pp. 2327-2335.
"Purely Gain-Coupled Distributed Feedback Semiconductor Lasers", by Y. Luo et al, Applied Physics Letters, vol. 56 (17), Apr. 23, 1990, pp. 1620-1622.
"Fabrication and Characteristics of Gain-Coupled Distributed Feedback Semiconductor Lasers With a Corrugated Active Layer", by Y. Luo et al, IEEE Journal of Quantum Electronics, vol. 27, No. 6, Jun. 1991, pp. 1724-1730.
"CW Operation of an InGaAsP/InP Gain-Coupled Distributed Feedback Laser With a Corrugated Active Layer", by T. Inoue et al, IEEE Transactions Photonics Technology Letters, vol. 3, No. 11, Nov. 1991, pp. 958-960.
"1.55 .mu.m Gain-Coupled Quantum-Well Distributed Feedback Lasers With High Single-Mode Yield and Narrow Linewidth", by B. Borchert et al., IEEE Transactions Photonics Technology Letters, vol. 3, No. 11, Nov. 1991, pp. 955-957.
"Facet Reflection Independent, Single Longitudinal Mode Oscillation in a GaAlAs/GaAs Distributed Feedback Laser Equipped With a Gain-Coupling Mechanism", by Y. Nakano, Applied Physics Letters, vol. 55 (16), Oct. 16, 1989, pp. 1606-1608.
AT&T Bell Laboratories
Davie James W.
Pacher E. E.
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