| 摘要 |
A Raman amplifier ( 10 ) including at least one amplifying fiber ( 12 ) and a coupler ( 14 ) for coupling at least first ( 16 ) and second ( 18 ) pump laser modules to the amplifying fiber ( 12 ), the first pump laser module ( 16 ) including a frequency discriminator ( 24 ) for selecting an optical frequency to be emitted with an optical power exceeding an optical power of remaining optical frequencies that are also emitted by the first pump laser module ( 16 ). The first optical frequency is spaced apart from a local maximum ( 28; 36; 48 ) in optical power of the remaining optical frequencies, and the second pump laser module ( 18 ) emits at an optical frequency one Stokes-frequency above the frequency of the local maximum ( 28; 36; 48 ). The first optical frequency and the frequency of the local maximum are chosen on Stokes-frequency above the signal frequency range. As a consequence, the Raman gain provided in the Raman amplifying fiber 12 is broadened.
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