Optical transmitter and wavelength division multiplexing transmission system

摘要

An objective is to prevent optical signals that are transmitted from other optical transmitters received normal input data signals from being amplified more than necessary by an optical amplifier disposed on an optical transmission line, even if a certain optical transmitter receives an abnormal input data signal. Each optical transmitter 1 forming a wavelength division multiplexing transmission system according to the present invention is provided with an electric signal monitoring unit 35 for monitoring an electric signal based on an input data signal fed, the electric signal being to be converted into an optical signal; an optical signal monitoring unit 34 for monitoring the optical signal and preparing monitor information; and a CPU 37 for performing such control that when the electric signal monitoring unit 35 determines that the electric signal is abnormal on the basis of an abnormality of the input data signal fed, a power of the optical signal is controlled to a power of an optical signal in reception of a normal input data signal, based on the monitor information prepared by the optical signal monitoring unit 34.