NODE APPARATUS AND METHOD FOR RECEIVING OPTICAL SIGNAL THEREOF AND RING NETWORK SYSTEM

摘要

PURPOSE: A node device and method for receiving an optical signal of the same, and a ring network system thereof are provided to composes a ring network system at a low cost. CONSTITUTION: A source node device among node devices(100a) transmits an optical signal through a transmission medium by using a wavelength division multiplexing. A transmission device(102a) outputs at least one optical wave signal, which is desired to be transmitted, to multiplexing device(104). A multiplexing device generates an optical signal by multiplexing the outputted wavelength signal forma transmission device and outputs an optical signal to an optical combination unit(106). An optical combining unit combines an optical signal which itself will transmit and the optical signal transmitted from another node device. An amplifier device(108) transmits a next node device(100b) through an optical fiber by amplifying the optical signal combined in the optical combining unit.