Evaluation of gain spectrum of dual/triple pumped fiber Raman amplifier (FRA) by optimizing its pumping parameters in the scenario of dense wavelength division multiplexed (DWDM) systems

Fiber Raman Amplifier (FRA) is a fundamental amplifier that has the capability to operate in any communication band. No exceptional doping in the optical fiber is required in order to generate amplification using Raman scattering. In present work, we have investigated the gain spectrum evolutions of a dual/triple pumped FRA for 0.8 nm, 0.4 nm and 0.2 nm channel spacings by varying number of pumps, operating pump wavelengths and their respective pump powers. It has been observed in the case of triple pumped FRA that deployment of three continuous wave (CW) lasers at 1390 nm, 1410 nm and 1440 nm wavelengths yields enhanced gain >15 dB in the region 1489.4 nm-1578.20 nm (88.8 nm) at 0.2 nm channel spacing.