| 摘要 |
Different pump signals (S.lambda.1,..., S.lambda.N) are contradirectionally coupled into an optical fibre (LWL) in order to amplify a WDM signal (S.lambda.i) with stimulated Raman scattering. The outputs of the pump laser s (P1, ,PM) with their different wavelengths are distributed in such a way tha t all of the channels of the WDM signal have a flat curve for the optical sign al- to-noise ratio at the transmission fibre end. A filter (F) for adjusting all of the channel levels is also connected to the output of the Raman amplifier so that the level curve of all of the channels is also flat. As a result, al l of the channels of a WDM signal have the same signal-to-noise ratio and identical levels at the fibre end.
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