Article comprising a DFB laser with loss coupling

Details Article comprising a DFB laser with loss coupling Article comprising a DFB laser with loss coupling

1995-02-16

1996-04-09

Davie, James W.

Coherent light generators

Particular resonant cavity

Distributed feedback

372 45, H01S 308

Patent

active

055068596

ABSTRACT:
A DFB laser with improved loss grating is disclosed. The grating contains periodically patterned first and second semiconductor layers that are embedded in semiconductor material of composition selected to provide relatively low loss for the laser radiation. The composition of the first layer is selected to provide a relatively high refractive index and loss for the laser radiation, and the composition of the second layer is selected to provide relatively low refractive index and loss for the laser radiation. The thicknesses of the first and second layers are selected such that the real part of the coupling constant .vertline..kappa.'.vertline. is less than the imaginary part of the coupling constant .vertline..kappa.".vertline.. In preferred embodiments .vertline..kappa.'.vertline..ltoreq.0.5.vertline..kappa.".vertline., even.ltoreq.0.2.vertline..kappa.".vertline..

REFERENCES:
patent: 5319666 (1994-06-01), Ackerman
patent: 5452318 (1995-09-01), Makino et al.
"Yield Analysis of Non-AR-Coated DFB Lasers With Combined Index and Gain Coupling", by David, Morthier, Vankwikelberge and Baets, Electronics Letters, vol. 26, No. 4, 15 Feb. 1990, pp. 238-239.
"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.
"Linewidth Reduction of DSM Lasers Due to Effects of Composite Cavity and Distributed Reflectors", by K. Kudo et al., IEEE Journal of Quantum Electronics, vol. 29, No. 6, Jun. 1993, pp. 1769-1781.
"The Optical Gain Coupling Saturation Effect on the Linewidth Property of Complex Coupled DFB Lasers", by K. Kudo et al., IEEE Photonics Technology Letters, vol. 6, No. 4, Apr. 1994, pp. 482-485.
"The Weighted Index Method: A New Technique For Analyzing Planar Optical Waveguides", by M. J. Robertson et al., Journal of Lightwave Technology, vol. 7, No. 12, Dec. 1989, pp. 2105-2111.

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