Optical communication systems, optical multiplex communication system, optical communication method, optical multiplex communication method and the optical receiver

摘要

PPROBLEM TO BE SOLVED: To provide an optical multi-communication system and its method which can eliminating a disturbance optical signal at the previous stage of a photodetector and realizes optical transmission with no mutual interference between the existing optical communication system and an added optical communication system of an optical CDM (code division multiplex) method. PSOLUTION: This optical multi-communication system has a first optical transmitter for transmitting an optical signal for communication of an optical CDM method, a second optical transmitter for transmitting an optical signal for communication different from the optical signal for communication, a first optical receiver for receiving the optical signal for communication transmitted from the first optical transmitter, and a second optical receiver for receiving the other optical signal for communication transmitted from the second optical transmitter. The first optical receiver is provided with a disturbance optical signal eliminator for branching the optical signal received by the first optical receiver into two optical signals or more, providing prescribed optical path length difference, combining the optical signals and outputting the combined optical signals at prescribed light intensity, and a photodetector for detecting the optical signals output from the disturbance optical signal eliminator. PCOPYRIGHT: (C)2006,JPO&NCIPI