OPTICAL COMMUNICATION SYSTEM FOR OPTICALLY COMBINING BOTH OF BASE BAND SIGNAL AND PASS BAND SIGNAL

PROBLEM TO BE SOLVED: To obtain a system capable of distributing an additional band width exceeding 1 Gbps to each subscriber by optically combining a base band signal and a pass band signal and transmitting the combined signal through a common optical fiber. SOLUTION: A system 30 is provided with a first light transmitter 40 for responding to an inputted electric base band signal from a base band source 28 and a second light transmitter 41 for responding to an inputted electric pass band signal from a pass band source 29. The transmitters 40 and 41 separately generate optical signals including information on the inputted signal of each. Next, an optical coupler such as an optical power coupler 42 optically combines the optical signals to transmit the combined optical signals to a light receiver 35, which is capable of detecting and demodulating both of the base band signal and the pass band signal. The receiver 35 is also capable of executing the electricity/light conversion of the pass band signal deeper in a network to allow a central station to provide an optical pass band signal.