| 摘要 |
An optical transmitter/receiver is provided which has a fast main transmission channel and a slow sub transmission channel, which sub transmission channel is used for control purposes. The optical transmitter/receiver is provided with a transmission unit for generating an optical signal that superimposes a broadband signal for a main transmission channel on a narrowband signal for a sub transmission channel. The broadband signal has a blank region formed in its power spectrum and is encoded in a redundant format. The power spectrum of the narrowband signal is formed in the blank region of the main broadband signal. Further, the transmission power of the broadband signal is greater than that of the narrowband signal Accordingly, it is possible to reduce cross-modulation that originates in the limiter used for gain control, and to make equal the receiving conditions of the main transmission channel and a sub transmission channel.
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