Patent ID: 6567198
Filing Date: 2003-05-20
Classification: H04B

Abstract:
A wavelength stabilizer for stabilizing the wavelength of an optical signal generated from a laser diode (LD) in each of a plurality of channel transmitters in a WDM (Wavelength Division Multiplex) optical transmission system, comprising:a temperature controlling circuit in each channel transmitter, for sensing an LD operating temperature and maintaining the LD at a reference temperature; a wavelength division multiplexer for multiplexing optical signals generated by the plurality of channel transmitters; a wavelength monitor connected to the wavelength division multiplexer by an optical transmission line, for monitoring the wavelength deviation of an optical signal for each channel in the multiplexed signal and outputting wavelength deviation information; and a controller coupled to the wavelength monitor for determining the wavelength deviation of each channel from the wavelength deviation information and updating the reference temperature of the temperature controlling circuit of each channel transmitter based on the wavelength deviation information; wherein the controller updates the reference temperature by a predetermined value to compensate for the wavelength deviation.