Patent ID: 8565604

Claim:
An optical signal adjustment apparatus that makes optical signal intensity levels of input signal light components corresponding to different wavelengths uniform, the optical signal adjustment apparatus comprising: a plurality of monitoring and adjusting units, each unit including: an optical detector detecting an optical signal intensity level of a respective input signal light component corresponding to one of the different wavelengths, and a variable optical attenuator adjusting attenuation of the respective input signal light component corresponding to said one of the different wavelengths; and a controller configured to receive the optical signal intensity levels as detection signals from each of the optical detectors, successively select each one of the detection signals, generate control signals for the input signal light components corresponding to the different wavelengths based on the selected detection signals, and supply a control signal to each of the variable optical attenuators to make the optical signal intensity levels of the input signal light components corresponding to the different wavelengths uniform, and wherein the controller includes a memory that stores an order table indicative of a selection order to successively select each one of the detection signals.