Design and analysis of a novel multipumped Raman fiber amplifier

We design a Raman Fiber Amplifier(RFA) pumped by 1435nm and 1470nm wavelength lasers.Heavy GeO2-doped optical fibers are adopted as gain media for the more symmetrical gain curve.The amplifier is designed to be distributed in two fibers to avoid intense power transferring between the two pump lasers when propagating in single fiber.Considering the spontaneous Raman scattering and the fiber loss,the numerical calculation is made to optimize the design of the RFA to get wide bandwidth and flat gain.