Patent ID: 7676127
Filing Date: 2010-03-09
Classification: H04B,H04J,H04Q

Abstract:
1. An optical communication system comprising: a plurality of first apparatuses connected to branch optical fibers branching from a trunk optical fiber; and a second apparatus connected to the trunk optical fiber, each of said first apparatuses including: a plurality of spread-spectrum spreaders having different spreading codes; at least one optical signal transmitter for transmitting to one of said branch optical fibers a CDMA signal generated by spread spectrum by each of said spread-spectrum spreaders as an optical CDMA signal having a carrier wavelength different from carrier wavelengths of the other first apparatuses; and a first controller, said second apparatus including: an optical signal receiver for receiving a wavelength-division-multiplexed optical CDMA signal through the trunk optical fiber; a plurality of spread-spectrum despreaders having different spreading codes to each other and connected to the optical signal receiver; and a second controller for managing a wavelength and a spreading code to be used for each of said first apparatuses, wherein the second controller specifies, in response to a request from each of said first controllers, a transmission timing and a wavelength and a spreading code different from that of the other first apparatuses, and each of said first apparatuses spreads transmission data by the spread-spectrum spreader having the specified spreading code, converts the spread data into an optical signal having the specified wavelength and transmits the optical signal to said branch optical fiber at the specified transmission timing by said optical signal transmitter.