| 摘要 |
A transmitter and a receiver for use in transmitting information over a non-linear optical channel are disclosed. The transmitter includes a signal generator, adapted to generate an information-bearing electrical signal including a plurality of closely-spaced sub-carriers in a frequency domain; means for determining a time-varying phase modulation which is a function of a transmitted optical power characteristic corresponding with the information-bearing electrical signal; an optical source for generating an optical carrier wave; and at least one modulation means arranged to apply the information-bearing electrical signal and the time-varying phase modulation to the optical carrier wave, to generate a corresponding transmitted optical signal having substantially the transmitted optical power characteristic. The receiver includes an optical detector arranged to detect a received optical signal corresponding with an information-bearing electrical signal including a plurality of closely-spaced sub-carriers in a frequency domain, which has been modulated onto an optical carrier, and transmitted over the non-linear optical channel; means for determining a time-varying phase modulation which is a function of a received optical power characteristic corresponding with the received optical signal; at least one modulation means arranged to apply the time-varying phase modulation to the received signal; and a signal decoder adapted to recover the transmitted information from the resulting phase-modulated received signal. The function of transmitted optical power and received optical power is selected so as to mitigate the effect of the non-linearity of the optical channel upon the transmitted optical signal. An optical transmission system including a transmitter as described above with an optical receiver, and having a non-linear optical channel disposed therebetween, for conveying optical signals from the transmitter to the receiver is disclosed. Also is an optical transmission system including a receiver as described above with an optical transmitter and having a non-linear optical channel disposed therebetween, for conveying optical signals from the transmitter to the receiver. |
