| 摘要 |
A Raman-amplified optical transmission system ( 1 ) comprises at least one transmission fiber ( 4 ) for Raman amplifying of an optical signal (S), at least one corresponding pump ( 5, 5.1, 5.2, 5.3 ) for pumping the transmission fiber ( 4 ) at a plurality of pumping wavelengths (lambdaP 1, lambdaP 2, lambdaP 3 ), at least one Lumped Raman Amplifier LRA ( 9, 10, 11 ) for imparting an additional gain on the optical signal (S), and at least one corresponding LRA pump ( 10, 10.1 ) for pumping the lumped Raman amplifier LRA. According to the present invention the LRA pump ( 10, 10.1 ) is adapted to operate at a single LRA pumping wavelength (lambdaP 3 ), which is essentially equal to one of the pumping wavelengths (lambdaP 3 ) of the pump ( 5, 5.3 ) for pumping the transmission fiber ( 4 ). In this way the present invention provides an optical transmission system ( 1 ) and a corresponding method for amplifying optical signals (S), respectively, which distinguish themselves with respect to cost effectiveness, compactness of realisation, and possible gain control, particularly in relation with constant-gain operation, from prior art solutions.
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