| 摘要 |
An optical telecommunication system comprises 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 said common optical fibre of said multiplexer; means for receiving said signals; an element for reducing the four wave mixing (FWM) between said signals, optically connected in series along said optical-fibre line, wherein said FWM-reducing element comprises an optical circuit including at least two-wavelength-selective filters, each relative to a wavelength band including one of said optical signals, said filters being optically connected in series with each other over an optical path, the length of at least one section of said optical path included between two consecutive filters being greater than the length corresponding to the coherence time of at least one of said sources of optical signals. <IMAGE>
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