Optical add/drop multiplexer apparatus, method of controlling the same and optical communication system

摘要

In the OADM apparatus incorporates a reflecting filter having a tunable mechanism, part of an added or dropped signal light is branched and extracted as a monitor light, and the monitor light is further branched into two lights. One of the two lights after branching is passed through an optical filter having wavelength dependency. The monitor light that has passed through the optical filter and the other monitor light that has not passed through the optical filter are guided to detectors of a detection circuit. The ratio of optical power of the two monitor lights is obtained, and the tunable mechanism is controlled so that the value of the ratio may be a predetermined value.