Coherent light generators – Particular temperature control
Patent
1996-07-13
1998-04-14
Scott, Jr., Leon
Coherent light generators
Particular temperature control
H01S 304
Patent
active
057401918
ABSTRACT:
A laser transmitter that includes a heating element coupled to the laser package and controlled to allow the laser to be kept at a higher temperature than ambient when low temperature extremes occur, thus limiting the range of wavelengths output by the laser over a given temperature range. The laser transmitter includes a semiconductor laser having an associated operating temperature; a laser driver circuit coupled to the semiconductor laser to control a modulation current and bias current conducted by the semiconductor laser; a heating element thermally coupled to the semiconductor laser; and a heating control circuit that (i) senses a temperature substantially representative of the ambient temperature surrounding the laser transmitter, (ii) energizes the heating element to provide heat to the semiconductor laser only when the temperature substantially representative of the ambient temperature is sensed below a predetermined minimum temperature, and (iii) upon energizing the heating element, controls heating of the heating element based on the temperature substantially representative of the ambient temperature.
REFERENCES:
patent: 5214660 (1993-05-01), Masuko et al.
patent: 5602860 (1997-02-01), Masonson
Bosch Fridolin Ludwig
Kasper Bryon Lynn
Jr. Leon Scott
Lucent Technologies - Inc.
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