Ciena Corporation

Jon Tsou

Balakrishnan Sridhar

Jun Bao

Si Hyung Cho

An exemplary embodiment of the invention is a Raman amplifier for use in an optical communications network. The Raman amplifier includes a plurality of pump lasers and a plurality of wavelength control modules, each associated with one of the pump lasers. Each wavelength control module includes a fiber Bragg grating optically coupled to a respective one of the plurality of pump lasers. The fiber Bragg grating receives a pump laser output from one of the pump lasers and generates a wavelength control module output. A temperature sensor is in thermal contact with the fiber Bragg grating and generates a temperature signal indicative of a temperature of the fiber Bragg grating. A controller is operatively connected to the temperature sensor and generates a control signal in response to the temperature signal. A thermal regulator is in thermal contact with the fiber Bragg grating and adjusts the temperature of the fiber Bragg grating in response to the control signal. The controller adjusts the temperature of the fiber Bragg grating to reduce sensitivity of Raman gain flatness to variation in a wavelength of the pump laser output.

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Baltimore, MD, United States of America

Jon Tsou