Patent ID: 6771413
Filing Date: 2004-08-03
Classification: H01S,H04B

Abstract:
A method of transmitting optical signals, comprising:transmitting optical signals, in an optical signal wavelength range, via a transmission media; amplifying the optical signals a plurality of times at a plurality of separate locations to produce a composite optical signal gain profile, wherein amplifying includes counter pumping optical energy in the transmission media in a first pump wavelength range and co-pumping optical energy in the transmission media in a second pump wavelength range to produce Raman amplification of the optical signals; and wherein counter pumping includes producing a counter pumping noise figure profile over the optical signal wavelength range corresponding to the Raman amplification; and wherein co-pumping includes varying the counter pumping noise figure profile over at least a portion of the optical signal wavelength range; and filtering the composite optical signal gain profile produced by amplifying the optical signal a plurality of times to produce a desired gain profile for the optical signals.