WAVELENGTH MULTIPLEXED OPTICAL TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a wavelength multiplexed optical transmission system capable of holding the high quality of transmission without using a variable light attenuation means or a waveguide type optical filter even when the number of channels is small, and to provide a wavelength multiplexed optical transmission system capable of holding the high hiquality of transmission by controlling the order of increasing the number of channels. SOLUTION: The wavelength multiplexed optical transmission system has an optical transmission line 1 such as an optical fiber for transmitting a plurality of signals by individual wavelengths and plural optical amplifiers arranged on a plurality of stages of the optical transmission line 1 and transits data by the wavelength of the center part of a transmission band to be transmitted or a short wavelength side wavelength. In the case of increasing the number of wavelength channels to be transmitted, the channels are successively arranged and set from the center part of the transmission band or from the short wavelength side.