Distributed-feedback laser having enhanced mode selectivity

Details Distributed-feedback laser having enhanced mode selectivity Distributed-feedback laser having enhanced mode selectivity

1986-06-30

1988-04-26

Davie, James W.

Coherent light generators

Particular resonant cavity

Distributed feedback

372 45, 372 46, H01S 308, H01S 319

Patent

active

047409878

ABSTRACT:
A distributed-feedback laser includes in its grating a localized phase-slip discontinuity which is placed off-center. Such discontinuity results in a quarter-wave phase slip, and it can be placed, e.g., such as to maximize the difference between threshold gain of the lowest-lasing mode and cavity loss of the next-to-lowest-lasing mode. The invention is applicable especially where laser output intensity differs at two output facets and results in enhanced mode selectivity during laser operation.

REFERENCES:
patent: 3760292 (1973-09-01), Kogelnik et al.
patent: 4096446 (1978-06-01), Haus et al.
patent: 4701930 (1987-10-01), Akiba et al.
"Stimulated Emission in a Periodic Structure", Applied Physics Letters, vol. 18 (1971), pp. 152-154.
"Antisymmetric Taper of Distributed Feedback Lasers", IEEE Journal of Quantum Electronics, vol. QE-12 (1976), pp. 532-539.
"1.5 .mu.m Phase-shifted DFB Lasers for Single-mode Operation", Electronics Letters, vol. 20 (1984), pp. 80-81, by K. Sekartedjo et al.
H. C. Casey, Jr. et al., "Heterostructure Lasers", Part A, Academic Press, 1978, pp. 24-30.
G. P. Agrawal et al., Longwavelength Semiconductor Lasers, Van Nostrand Reinhold Company, New York, 1986, p. 40.

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