Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1990-09-28
1992-02-25
Davie, James W.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 19, 372 50, H01S 3098, H01S 319
Patent
active
050919164
ABSTRACT:
Improved side mode suppression with significantly reduced side mode suppression ratio fluctuation during laser tuning is realized in a distributed Bragg reflector laser structure by incorporating at least one reflector element which exhibits an asymmetric reflection characteristic versus wavelength over a band of wavelengths wide enough to include at least two longitudinal modes of the laser. That is, the asymmetric characteristic is wider than the mode separation for adjacent longitudinal modes of the laser. In one embodiment, a distributed Bragg reflector laser is shown wherein the Bragg reflector includes a corrugated waveguides with corrugations having a period which varies nonlinearly from .LAMBDA..sub.O at one end of the reflector to .LAMBDA.hd L at the opposite end of the reflector, where .LAMBDA..sub.O is greater than .LAMBDA..sub.L. Integrated and extended cavity or hybrid structures are described in both semiconductor and fiber laser structures.
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Cimini, Jr. Leonard J.
Habbab Isam M. I.
AT&T Bell Laboratories
Davie James W.
Ranieri Gregory C.
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