Patent ID: 6525870
Filing Date: 2003-02-25
Classification: H01S

Abstract:
A Raman amplifier for use in an optical communications network, the Raman amplifier comprising:a plurality of pump lasers; a plurality of wavelength control modules, each wavelength control module associated with one of said pump lasers, each wavelength control module including: a fiber Bragg grating optically coupled to a respective one of said plurality of pump lasers, said fiber Bragg grating receiving a pump laser output from said one of said plurality of pump lasers and generating a wavelength control module output; a temperature sensor in thermal contact with said fiber Bragg grating, said temperature sensor generating a temperature signal indicative of a temperature of said fiber Bragg grating; a controller operatively connected to said temperature sensor, said controller generating a control signal in response to the temperature signal; and a thermal regulator in thermal contact with said fiber Bragg grating, said thermal regulator adjusting the temperature of said fiber Bragg grating in response to the control signal; wherein said controller adjusts the temperature of said fiber Bragg grating to reduce sensitivity of Raman gain flatness to variation in a wavelength of the pump laser output.