Patent ID: 7898732
Filing Date: 2011-03-01
Classification: H01S,H04B

Abstract:
1. A bidirectionally-pumped Raman amplifier that is responsive to an optical signal having a plurality of optical signal channels, comprising: at least one backward optical pump that injects backward optical power by a counter-propagating signal-pump optical interaction with the optical signal; at least one forward optical pump that injects forward optical power by a co-propagating signal-pump optical interaction with the optical signal; a measurement unit configured to determine an input signal power variation for at least one wavelength region, the plurality of optical signal channels being associated with the at least one wavelength region; a control unit configured to: the first optical pump configured to adjust a first pump power output in accordance with the fixed pump power value; the second optical pump configured to adjust a second pump power output in accordance with the pump power adjustment; and the predetermined function comprising: wherein k corresponds to a k th wavelength region, wherein j corresponds to a j th forward Raman pump, ΔS L (k) corresponds to the input signal power variation for the k th wavelength region as linearly scaled, ΔP d (j) corresponds to the forward pump power adjustment of the j th forward Raman pump as logarithmically scaled, and T dL (j,k) corresponds to a linear coefficient relating the forward pump power adjustment of the j th forward Raman pump and the input signal power variation for the k th wavelength region.