Aspects of Single Mode Germania-Doped Fiber Raman Amplifier for Optical Fiber Communication Systems

摘要

There exists a rich collection of nonlinear optical effects in fused Silica fiber; each of which manifests itself in a unique way. The maximum limit of a repeater span in single mode Germania-doped fiber utilizing bi-directional Raman amplification is investigated under the consideration of signal degradation due to both attenuation and dispersion limitations. The.maximum repeater spacing L is evaluated in the region 1.3-1.6 μm signal wavelength considering the dependence of Raman gain and optical linear loss on the relative refractive difference, the mole fraction percentage of the dopant and the input power. For a low loss step index GeO_2 single mode fiber system operating at 1.432 μm and a temperature of 260 K, a maximum repeater spacing more than 570 km occurs at an input forward pump power of 1 W, backward pump power of 0.75 W and a fiber Δ of 1.2% with corresponding mole fraction percentage of 5-18% to achieve a considerable confinement of signal along fiber length.