Patent ID: 7116470
Filing Date: 2006-10-03
Classification: H01S,H04B

Abstract:
1. A Raman amplifying device for amplifying signals (S 1 , S 2 . . . S n ) with wavelengths λ S1 , λ S2 . . . λ Sn comprising an optical path, pump sources (P 1 ,P 2 . . . P N ) for generating a plurality of Raman pump signals (λ 1 ,λ 2 ,. . . λ N ) for backward pumping and means for coupling ( 2 1 , 2 2 , . . . 2 N )) the plurality of Raman pump signals into the optical path, wherein the plurality of optical Raman pump signals are time-division multiplexed by multiplexing controlling means ( 4 1 , 4 2 , . . . 4 N ) for time-division multiplexing the plurality of optical Raman pump signals such that the time-division multiplexing frequency is higher than the minimal corner frequency f c of the co-propagating pump-to-signal modulation transfer function among the co-propagating pump-to-signal modulation transfer functions that implicate the signals (S 1 , S 2 . . . S n ) and the pumps (P 1 ,P 2 . . . P N ): where V