OPTICAL AMPLIFICATION AND TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To broaden a signal transmission band by adjusting the wavelength and light output of an exciting light source and setting the Raman amplification band to respective exciting light wavelengths so as to include all of signal light wavelengths. SOLUTION: Wavelength synthesizing couplers 12-1, 12-2 are arranged at both ends of an optical fiber transparent path 11 for transmitting the signal light of a wavelength λs. The exciting light source 13-1 which outputs the exciting light of a wavelength λp1 is connected to the wavelength synthesizing coupler 12-1 and the exciting light source 13-2 which outputs the exciting light of a wavelength λp2 is connected to the wavelength synthesizing coupler 12-2. When λp1<λp2 is set, the Raman amplification bands to the respective exciting light wavelengths are formed to the different wavelength bands corresponding to the wavelength difference between λpl and λpe. Then, the Raman amplification band may be made wider so as to include the signal light wavelength λs by selecting adequately λp1 and λp2.