Laser control circuit and laser module

Details Laser control circuit and laser module Laser control circuit and laser module

2005-04-26

2005-04-26

Lee, Wilson (Department: 2821)

Coherent light generators

Particular component circuitry

Having feedback circuitry

C372S029010, C372S029011, C372S029014, C372S032000, C372S038100, C372S038020

Reexamination Certificate

active

06885684

ABSTRACT:
A laser control circuit comprises a temperature control circuit and a data processing circuit. The temperature control circuit adjusts the temperature of a laser diode by controlling a temperature regulator. The data processing circuit receives the output of a wavelength monitor. The data processing circuit first adjusts the, temperature of the laser diode to a temperature value previously associated with the target wavelength. Then the data processing circuit finely adjusts the temperature of the laser diode according to the output of the wavelength monitor. Because rough adjustment has been carried out, it is not necessary to change the wavelength significantly according to the output of the wavelength monitor. Therefore, the periodic wavelength dependence of the output of the wavelength monitor does not decrease the accuracy of the control.

REFERENCES:
patent: 6212210 (2001-04-01), Serizawa
patent: 6477190 (2002-11-01), Komiyama et al.
patent: 6529534 (2003-03-01), Yasuda
patent: 20020172243 (2002-11-01), Ono et al.
patent: 20030043865 (2003-03-01), Nasu et al.
patent: 20040036007 (2004-02-01), Wilson et al.
patent: 11-251673 (1999-09-01), None
patent: 2001-284711 (2001-10-01), None

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