Patent ID: 6282002
Filing Date: 2001-08-28
Classification: H01S,H04B

Abstract:
An optical transmission system comprising:a plurality of optical processing nodes configured to optically communicate via optical signals in a signal wavelength range; and,a plurality of signal varying devices positioned to vary an optical signal passing between said processing nodes, wherein said plurality of signal varying devices includesa first signal varying device at a first location including optical fiber provided with optical energy in a first set of pump wavelengths from a first corresponding pump source to produce Raman gain having a first signal variation profile over the signal wavelength range, anda second signal varying device at a second location remote from said first location and including optical fiber provided with optical energy in a second set of pump wavelenghts from a second corresponding pump source to produce Raman gain having a second signal variation profile ever the signal wavelength range, wherein said first and second signal variation profiles provide for a cumulative signal variation profile over the signal wavelength range that differs from either of the first and second signal variation profiles.