Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2004-12-21
2008-05-06
Nguyen, Dung (Michael) T. (Department: 2828)
Coherent light generators
Particular beam control device
Optical output stabilization
C372S038020, C372S029015
Reexamination Certificate
active
07369587
ABSTRACT:
Optoelectronic devices and methods are used to maintain a CWDM transmitter operating within design parameters over an extended ambient temperature range. In order to avoid excessive wavelength drift with temperature shifts, lasers in the CWDM transmitters are heated or cooled to a selected temperature, for example by using a thermoelectric cooler. By heating and cooling the lasers, any wavelength drift that an ambient temperature variation might inflict on the laser is minimized to the range hotter or colder than the selected temperature. As the temperature range of the laser increases above the selected temperature, the AC swing driving the laser is increased to maintain a sufficient extinction ratio for acceptable transmitter performance.
REFERENCES:
patent: 5019769 (1991-05-01), Levinson
patent: 2002/0196491 (2002-12-01), Deng et al.
patent: 2003/0152118 (2003-08-01), Chieng et al.
patent: 2004/0022543 (2004-02-01), Hosking et al.
patent: 2004/0161001 (2004-08-01), Stewart et al.
U.S. Appl. No. 60/546,782, filed Feb. 21, 2004, entitled “Power Optimization for Operation of Laser with Thermoelectric Cooler.”
Ho Anthony
Stewart James
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