Optical communications device and transmission control method

An optical communications device coupled to a plurality of optical transmission paths of a plurality of routes (degrees), the optical communications device performing adding, dropping, or pass-through coupling of WDM signal light transmitted on the plurality of optical transmission paths, the optical communications device including:

• a first wavelength filter that separates the signal light input from one of the plurality of optical transmission paths, into a first signal band and a second signal band;
• a first wavelength converter that converts the second signal band into a third signal band;
• a first adding/dropping unit that adds or drops the first signal band with respect to a desired one of the plurality of routes;
• a second adding/dropping unit that adds or drops the third signal band with respect to a desired one of the plurality of routes;
• and
• a first optical switch selectively guiding the signal light from any one of the first adding/dropping unit and the second adding/dropping unit to an optical receiver.

A transmission control method for adding, dropping, or pass-through coupling WDM signal light transmitted on a plurality of optical transmission paths of a plurality of routes (degrees), the signal light being coupled to any one of the plurality of optical transmission paths, the method being executed by a processor, the method comprising:

• separating the signal light into a plurality of groups according to band;
• adding or dropping the signal light with respect to a desired one of the plurality of routes according to the band, which differs for each of the plurality of groups;
• converting a wavelength band of the signal light into a transmission band;
• and
• performing switching for the signal light that is to be added or dropped and coupling the signal light to a transceiver.