Patent ID: 8902492
Filing Date: 2014-12-02
Classification: H01S,H04B

Abstract:
1. An optical amplifier comprising: a temperature adjustment unit that is provided in a wavelength fixing unit that fixes a center wavelength of an excitation light source that is used to perform Raman amplification on signal light, and adjusts a temperature of the wavelength fixing unit, which causes the center wavelength of the excitation light source to vary; a temperature measurement unit that measures the temperature of the wavelength fixing unit and a temperature of a gain equalization unit that equalizes gains of the signal light in a certain wavelength band on which the Raman amplification is performed using the excitation light source; a shift amount obtaining unit that obtains a shift amount data of the center wavelength of the excitation light source, which corresponds to a temperature of the wavelength fixing unit, which is measured by the temperature measurement unit, from a first storage unit that stores data on a relationship between a temperature of the wavelength fixing unit and a shift amount of the center wavelength of the excitation light source at the temperature, and obtains a shift amount of the center wavelength of the wavelength band, which corresponds to the measured temperature of the gain equalization unit, from a second storage unit that stores data on a relationship between a temperature of the gain equalization unit and a shift amount of the center wavelength of the wavelength band at the temperature; and a control unit that obtains a temperature data of the wavelength fixing unit, which corresponds to a difference between two shift amounts that are obtained by the shift amount obtaining unit, from the first storage unit, and controls the temperature of the wavelength fixing unit that is adjusted by the temperature adjustment unit, based on the obtained temperature data.