Patent ID: 8045258
Filing Date: 2011-10-25
Classification: H04B

Abstract:
1. A method for selecting a relation between a gain G f of a Forward Raman Amplifier (FRA) at a transmitting end of a fiber optic transmission line and an optical signal to noise ratio (OSNR) at a receiving end of the fiber optic transmission line, provided that said transmission line operates under a non-linearity limit, and power loss L of the fiber optic transmission line is much greater than a selected value of the gain G f ; the method comprises selecting said relation by using a regulation function R OSNR of OSNR improvement, defined substantially close to the following expression: where R where μ=α/β, α is the fiber attenuation at the signal wavelength, β is the fiber attenuation of the Raman pump wavelengths, Γ(x) and Γ(x, y) are the Gamma and the incomplete Gamma functions, respectively.