This paper presents measurements of Raman amplification utilising the 800cm 1 band of silica. Although higher gains are obtainable with other bands in silica, the size of the Stokes shift enables pump and signal lasers to operate in the l.3um and l.5um communications windows respectively. A maximum gain of 3dB is reported.
D M Spirit,
"Raman Amplification Measurements Using The 800Cm-1 band In Silica Fibres", Proc. SPIE 0864, Advanced Optoelectronic Technology, (2 June 1988); doi: 10.1117/12.943534; https://doi.org/10.1117/12.943534