Article comprising a wavelength-stabilized semiconductor laser

Details Article comprising a wavelength-stabilized semiconductor laser Article comprising a wavelength-stabilized semiconductor laser

1993-03-10

1994-03-29

Bovernick, Rodney B.

Coherent light generators

Particular beam control device

Optical output stabilization

372 20, 372 43, H01S 3137, H01S 310, H01S 3133

Patent

active

052992128

ABSTRACT:
The disclosed article comprises a semiconductor laser (typically a multi-segment DBR laser) and feedback means for controlling the laser wavelength. The wavelength reference element in the feedback means advantageously is an optical fiber comprising an in-line refractive index grating. Such gratings frequently have a transmission spectrum that exhibits subsidiary lobes, in addition to the desired main lobe, potentially compromising the "cold-start" ability of prior art systems. This and other drawbacks of prior art systems exemplarily are overcome by apparatus that comprises a feedback loop that comprises means for causing a current I.sub.B to flow to the "Bragg" section of a multi-segment DBR laser such that wavelength of the laser output is a function of I.sub.B, and that further comprises means for changing the temperature of the laser in response to a change in the wavelength of the laser. Use of a wavelength reference element that has a relatively wide primary minimum facilitates cold starting. Exemplarily, the disclosed article is a wavelength division multiplexed (WDM) optical fiber communication system.

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"High Performance Tunable 1.5 micron InGaAs/InGAsP Multiple-Quantum-Well Distributed-Bragg-Reflector Lasers", T. L. Koch et al., Proceedings 11th IEEE International Semiconductor Laser Conference, 1988, pp. 120-122, No month available.

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