Patent ID: 6081366
Filing Date: 2000-06-27
Classification: G03F,H04B

Abstract:
An optical fiber communication system comprising a transmitter, a receiver, an optical fiber transmission link that signal-transmissively connects the transmitter and the receiver and comprises at least one erbium-doped optical fiber amplifier, and a source of pump radiation of wavelength .lambda..sub.p less than a signal wavelength .lambda..sub.s, said source of pump radiation being spaced from said erbium-doped optical fiber amplifier, with the pump radiation being transmitted to the erbium-doped optical fiber amplifier through at least a portion of said optical fiber transmission link that comprises silica-based single mode optical fiber selected to provide Raman gain at the signal wavelength;CHARACTERIZED IN THAT.lambda..sub.p is selected to be longer than an optimal wavelength .lambda..sub.p,Raman for producing said Raman gain, and also to be longer than an optimal wavelength .lambda..sub.p,EDFA for pumping the Er-doped optical fiber amplifier, with .lambda..sub.p selected to result in reduced multi-path interference.