| 摘要 |
PURPOSE:To prevent crosstalk from being caused in a network by providing plural optical filters passing only an optical signal having a frequency allocated to each optical transmitter to an output of each optical transmitter. CONSTITUTION:Plural optical filters 21 passing only optical signals P1-Pn having frequencies allocated to each optical transmitter 11 are provided to the output of each optical transmitter 11. Furthermore, a 1st feedback means monitoring the fluctuation of a multiplexed optical signal from a synthesizer 12 and applying feedback control to each optical transmitter 11 to cancel the fluctuation is provided. Even when the optical transmitter 11 is deteriorated, or removed or newly inserted, an undesired optical signal having a frequency other than the specified frequency caused thereby is all cut off by the optical filter 21 and not invaded to the optical transmission line 13. Thus, no crosstalk takes place in adjacent channels. |
