| 摘要 |
An optical telecommunication system includes at least two sources of optical signals modulated at different wavelengths, having respective coherence times; a multiplexer for multiplexing said signals in a single common optical fibre; an optical-fibre line connected at one end to the common optical fibre of the multiplexer; a receiver for receiving said signals; an element for reducing the four wave mixing (FWM) between the signals, optically connected in series along the optical-fibre line. The FWM-reducing element includes an optical circuit including at least two-wavelength-selective filters, each relative to a wavelength band including one of the optical signals. The filters are optically connected in series with each other over an optical path, and the length of at least one section of the optical path included between two consecutive filters is greater than the length corresponding to the coherence time of at least one of the sources of optical signals.
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