| 摘要 |
An optical communications system has a transmission path including an optical communications fibre 2 having an input port 3 and an output port 4. A compensating element 5 to compensate for a perturbation such as soliton jitter noise in an optical signal transmitted along said transmission path is coupled to the output port, which introduces dispersion of equal magnitude but opposite sign to that of the signal which has passed through system 1. Alternatively, (see fig. 5), a four wave mixer is corrected between identical compounds 1, 2, 7, 8 for spectrally inverting (by phase conjugation) the signal prior to re-transmission along a compensating fibre loop 8.
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