Optical communication apparatus, optical communication system and optical communication method

Abstract

An optical communication device includes: an optical switch configured to output an optical signal input from one transmission line to another transmission line among a plurality of transmission lines; and a control unit configured to control the optical switch such that a wavelength in accordance with a subscriber device and a transmission destination on a path of a communication destination is allocated to the subscriber device by using a control signal inserted or written by the control unit or a monitoring unit, and the input optical signal is output to the another transmission line corresponding to the communication destination. The subscriber device divides a main signal of the input optical signal into at least first and second partial main signals, inserts the control signal between the first and second partial main signals, inserts a time region for inserting the control signal in the control unit or the monitoring unit in a middle of a path, or inserts a writable signal region for overwriting using the control signal for transmission, deletes the control signal, the time region for inserting the control signal, or the writable signal region for overwriting using the control signal from a received signal, and combines the divided main signals to output the main signal.