| 摘要 |
PURPOSE:To minimize the number of wavelength variable transmission light sources provided to a transmission station by dividing a wavelength band of a transmission line into N, allowing plural reception stations to receive an optical signal for each of N wavelength bands and specifying a reception station depending on the combination of the wavelength of the optical signal in the N wavelength bands. CONSTITUTION:Transmission signals sent in a form of a data signal light with a 1st optical wavelength lambdak(1<=k<=32, k is an integer) in an operating wavelength band from transmission stations 11, 12,..., 1N and of a clock signal light with an optical wavelength lambda1 (33<=l<=64, l is an integer) in a 2nd operating wavelength band are multiplexed by a star coupler 1 and power is branched equally in reception stations 21, 22,..., 2N. The data signal and the clock signal are sent simultaneously only to a reception circuit of a reception station having a filter whose passing optical wavelength in the 1st operating wavelength band is lambdak and whose passing optical wavelength in the 1st operating wavelength band is lambdal among the reception stations 21, 22,..., 2N and the transmission signal is selectively sent to the reception station only. Thus, number of wavelength variable transmission light sources of the transmission stations is decreased. |
