Patent ID: 6697558
Filing Date: 2004-02-24
Classification: H01S,H04B

Abstract:
An optical fiber for use in a Raman amplified optical transmission system, the transmission system comprising an information signal source for providing an input signal in a predetermined wavelength range of &lgr;s1-&lgr;s2 and utilizing a Raman amplification pump in a predetermined wavelength range of &lgr;p1-&lgr;p2, said fiber exhibiting a predetermined group-velocity dispersion and zero-dispersion wavelength controlled to reduce noise components in the region of Raman amplification by maintaining said predetermined group-velocity dispersion to exhibit a value that is either non-positive or greater than 1.5 ps/nm-km in the pump wavelength range &lgr;p1-&lgr;p2 and maintaining said zero-dispersion frequency away from the average value of the sum of the pump frequency and the signal frequency.