| 摘要 |
PURPOSE:To reduce the variation of a transmitting state by executing communication through two optical transmission lines modulated by the same information. CONSTITUTION:A signal supplied from a transmitter to an input terminal 1 is distributed by a distributer 2 and supplied to two light emitters 3a, 3b. The light emitters 3a, 3b emit optical signals 4a, 4b modulated by the supplied signals and the optical signals 4a, 4b are transmitted through space and detected by photodetectors 5a, 5b. The optical signals detected by the photodetectors 5a, 5b are transduced into electric signals, the electric signals are added by a coupler 6 and the added signal is supplied to an output terminal 7. Since the optical signals 4a, 4b are transmitted through the completely different pathes, the probability of the simultaneous variation of the two transmission lines is reduced and the variation of the transmitting state can be reduced. |
