Open loop thermal compensation circuit that is suitable for...

Details Open loop thermal compensation circuit that is suitable for... Open loop thermal compensation circuit that is suitable for...

2006-05-30

2006-05-30

Bello, Agustin (Department: 2633)

Optical communications

Transmitter

Including compensation

C398S197000

Reexamination Certificate

active

07054564

ABSTRACT:
The present invention is directed towards an open-loop thermal compensation circuit that is suitable for use in a burst-mode laser transmitter. The compensation circuit adjusts the optical power level to ensure that the laser diode remains at an optimum power level. The thermal compensation circuit includes a thermistor having a thermal current, which is dependent upon any temperature fluctuations, where the thermal current adjusts a laser current. A change in the laser current subsequently adjusts the optical power level. Also included is a control circuit for turning on and off the laser diode with a control current, which is dependent upon the presence or absence of incoming electrical signals.

REFERENCES:
patent: 5646763 (1997-07-01), Misaizu et al.
patent: 6137607 (2000-10-01), Feldman et al.
patent: 6795656 (2004-09-01), Ikeuchi et al.
Scientific-Atlanta, Inc. Pending U.S. Appl. No. 09/840,753, filed Apr. 23, 2001, Title: “Burst-Mode Analog Transmitter,” Inventors: Lamar E. West, Jr. and Donald C. Sorenson.

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