Patent ID: 7139483

Claim:
An optical communication system comprising: a light source which is provided in a light supply source provided separately from a terminal station and supplies transmission light for generating an optical signal to a transmitting section; a transmitting section which is provided in the terminal station, which receives the transmission light supplied from the light supply source, generates an optical signal from the transmission light, and transmits the signal; a receiving section which is provided in a base station and receives the optical signal transmitted from said transmitting section; a first optical transmission line which connects said light source and said transmitting section and serves as a transmission line for the transmission light; and a second optical transmission line which connects said transmitting section and said receiving section and serves as a transmission line for the optical signal, wherein the transmission light comprises multi-wavelength light having a plurality of different wavelengths that can be used for coding, said transmitting section in the terminal station has an optical modulator which generates an optically modulated optical signal by optically modulating the transmission light, and a coder which generates an optically modulated coded optical signal by coding the optically modulated optical signal using a predetermined code, said receiving section in the base station has a decoder which decodes the optically modulated coded optical signal, the optically modulated coded optical signal is transmitted from the coder to said receiving section in the base station, the terminal station has a time adjuster which performs time adjustment for a transmission timing of the transmission light or the optically modulated coded optical signal, and when coders in a plurality of terminal stations are to use the same code sequence, the time adjuster adjusts a relative time difference between transmission light beams supplied to said plurality of terminal stations such that an off-peak correlation value of the code sequence used in said plurality of terminal stations becomes 0.