System for controlling wavelength of laser beam

Details System for controlling wavelength of laser beam System for controlling wavelength of laser beam

2002-03-22

2004-07-20

Ip, Paul (Department: 2828)

Coherent light generators

Particular beam control device

Optical output stabilization

C372S034000

Reexamination Certificate

active

06765938

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a system for controlling a wavelength of laser beam emitted by a signal light source for wavelength stability in the field of a wavelength division multiplexing (WDM) optical communication system.
Traditionally, a single-mode laser (e.g., distributed feedback (DFB) laser) may be employed as a signal light source for use with WDM system. In a dense WDM (commonly referred to as “DWDM”) system, any deviation of an output or lasing wavelength of the light source from a predetermined wavelength can lead to cross talks between adjacent optical channels in a such a manner as to deteriorate the optical signals. To avoid such a problem, there is a need for providing a system for effectively and efficiently adjusting the wavelength of the output laser light from the signal light source for wavelength stability.
SUMMARY OF THE INVENTION
The present invention provides a system for controlling a wavelength of laser light comprising:
a light-emitting device for outputting laser light; means for regulating a temperature of said light-emitting device;
a wavelength monitor for receiving the laser light transmitted from said light-emitting device through an optical filter, said optical filter having a periodic wavelength-transmissivity intensity curve;
a controlling unit for providing a control signal to control an current supplied to said temperature regulating means responsive to a output signal from said wavelength monitor; said control signal having a polarity; and
means for switching the polarity of said control signal.


REFERENCES:
patent: 6147795 (2000-11-01), Derbyshire et al.
patent: 6324197 (2001-11-01), Suda
patent: 6501774 (2002-12-01), Kuwahara et al.
patent: 6529534 (2003-03-01), Yasuda
patent: 2001/0021207 (2001-09-01), Serizawa

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