Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2005-05-10
2005-05-10
Wong, Don (Department: 2828)
Coherent light generators
Particular beam control device
Optical output stabilization
C372S029011, C372S038010, C372S038020, C372S038070, C372S034000
Reexamination Certificate
active
06891867
ABSTRACT:
A control apparatus for stabilizing optical wavelength output by a laser module in which a laser element, temperature sensor and cooling/heating element are installed, comprises a temperature deviation detecting circuit comprising a temperature monitor for detecting a laser temperature, and a first comparator for outputting a first control signal indicating a difference between the laser temperature and a control target value, a wavelength deviation detecting circuit comprising a wavelength monitor for detecting light output from the laser element, and a second comparator for outputting a second control signal indicating a difference between the wavelength of the detected output light and a control target value, a selector circuit for selecting either of the detecting circuits according to the external conditions of the laser element, and a current controller for controlling the current supplied to the cooling/heating element based on the output signal from the selected detecting circuit.
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Proceedings of the General Society of 1997 of the Institute of Electronics, Information, and Communication Engineers, B-10-215, p. 724.
OpNext Japan, Inc.
Rodriguez Armando
Sofer & Haroun LLP
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