| 摘要 |
A network element ( 5 ) for use in a wavelength division multiplex (WDM) optical transmission system ( 1 ). The WDM optical transmission system ( 1 ) comprises at least one demultiplexing means ( 5 c) adapted to demultiplex a received WDM signal into constituent wavelength channels carrying tributary signals with at least a first and at least a second data rate (DR 1 , DR 2 ). The optical transmission system ( 1 ) further comprises at least one first dispersion compensating module ( 5 e) connected with the demultiplexing means for receiving constituent wavelength channels carrying tributary signals having said first data rate (DR 1 ). Furthermore, the optical transmission system comprises at least one bypass bypassing the first dispersion compensating module and connected with the demultiplexing means for receiving constituent wavelength channels carrying tributary signals having said second data rate (DR 2 ). In this way, dispersion compensation of said first data rate constituent wavelength channels can be significantly improved while avoiding detrimental effects on said second data rate constituent wavelength channels.
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