Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1993-04-07
1994-06-07
Epps, Georgia Y.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 45, 372 50, H01S 308
Patent
active
053196660
ABSTRACT:
In some applications of distributed feedback (DFB) lasers, it is important that the coupling constant .kappa. be closely controlled. This is not easily achieved, frequently resulting in low yield of acceptable devices. I have discovered that variations in .kappa. can be reduced if the DFB laser is designed such that the thickness t.sub.s of a spacer layer (between the active layer and the Bragg grating) is within about .+-.10% of the value t.sub.o /(1-.alpha.), where t.sub.o is the modal decay length, and .alpha. is a parameter which characterizes the fractional variation of t.sub.o with fractional changes in layer thickness.
REFERENCES:
patent: 4704720 (1987-11-01), Yamaguchi
patent: 4852116 (1989-07-01), Takiguchi et al.
patent: 5012484 (1991-04-01), Flynn et al.
patent: 5020072 (1991-05-01), Abe et al.
patent: 5111475 (1992-05-01), Ackerman et al.
"Theory of Dielectric Optical Waveguides", by D. Marcuse, Academic Press, New York, 1974, pp. 49-59.
"Growth and Characterization of High Yield, Reliable, High-Power, High-Speed, InP/InGaAsP Capped Mesa Buried Heterostructure Distributed Feedback (CMBH-DFB) Lasers", J. L. Zilko et al., IEEE Journal of Quantum Electronics, vol. 25, No. 10, Oct. 1989, pp. 2091-2095.
AT&T Bell Laboratories
Epps Georgia Y.
Pacher Eugen E.
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