METHOD FOR CONVERTING WAVELENGTH USING OPTICAL FOUR WAVE MIXING AND CONSIDERING NOISE, WAVELENGTH CONVERTER AND LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To achieve a method for converting a wavelength, a wavelength converter and a wavelength multiplexing light source which are not susceptible to noise by high order optical four wave mixing. SOLUTION: When a wavelength of a wavelength division multiplexing signal light is converted by the optical four wave mixing, the noise occurs. The wavelength division multiplexing signal light after the wavelength is converted by the optical four wave mixing, is separated from a noise frequency. A guard band having a band of a frequency bandwidth or more of the signal light that its wavelength is converted from an excited light frequency to the wavelength of the signal light after being converted, is set. The noise frequency generated by the high order optical four wave mixing is allocated in a set region. Two methods are used. One method is to set one excited light for arranging the wavelength division multiplexing signal light after the wavelength is converted by the optical four wave mixing outside the guard band. Another method is to place the wavelength division multiplexing signal light before the wavelength is converted by the optical four wave mixing between an average frequency of the excited lights having two different frequencies and the frequency of one excited light, convert the wavelength by the optical four wave mixing, and place the wavelength division multiplexing signal light after the wavelength is converted by the optical four wave mixing between the average frequency of two excited lights and the guard band. A frequency position of the noise frequency becomes clear.