WDM TRANSMITTING DEVICE

摘要

A spectrometer (11) disperses received WDM light. A plurality of channels transmitted by the WDM light contains a mixture of mutually different bit-rate channels. A light receiving element (12) detects a level of light output from the spectrometer (11). A control device (15) measures a light level of each channel transmitted with the WDM light. A changeover control unit (16) adjusts the resolution of the spectrometer (11) in accordance with an instruction from the control unit (15). As light level information of each channel, a light level value measured with the resolution determined in accordance with a bit rate of a transmission signal is output.