Ramanhyphen;gain estimates for highhyphen;gain optical fibers

摘要

The amplification of light signals by the mechanism of stimulated Raman scattering is discussed, with specific reference to certain heavyhyphen;metal germanate and arsenate glasses with Ramanhyphen;gainhyphen;coefficientsGof up to 20 times that of fused silica. Calculations are presented of the intrinsic scattering losses from Rayleigh, Brillouin, and spontaneous Raman sources for these compositions which, when combined with the measuredGvalues, determine the potential signalhyphen;amplification capabilities as a function of pump power and fiber lengthL. Direct comparisons are made with an equivalent calculation for an ideally pure germania fiber. The results hinge sensitively upon the degree to which concentration fluctuations (leading to concentrationhyphen;scattering Rayleigh loss) are intrinsic in the multicomponent highhyphen;Gglass compositions. In spite of this, some compositions are located which can outperform pure germania fibers even in the presence of signficant concentrationhyphen;scattering loss. This is particularly so for high pump powers and short fiber lengthsL2 km.