Optical communication monitor

摘要

An optical communication monitor that easily and inexpensively enables the expansion of the number of channels and enables the intensity of channels of an optical signal to be easily recognized. The monitor includes an optical demultiplexer module (22) for dividing light, in which optical signals of multiple channels are multiplexed, in each channel to detect the optical signals and generate multiple detection signals. An electric circuit unit (23) is connected to the first demultiplexer module to process the detection signals and generate electric signals of the multiple channels. A board (21) on which the first electric circuit unit and the first optical demultiplexer module are located includes open area (24) for additionally mounting another optical demultiplexer module.