A Simplified Model and Gain Analysis of Raman-EDFA Hybrid Amplifier for DWDM System

Abstract Present communication delivers a novel kind of silica based hybrid amplifier which can find suitable application in DWDM optical network. The proposed hybrid amplifier includes both EDFA and Raman amplifier to envisage high gain characteristics for 64 channels in both S + C band and S + C + L wavelength band (1545–1570 nm). Various parameters of the hybrid amplifier such as doping concentration, pump power, pump wavelength, fiber length are judiciously chosen to optimize the gain profile. Aside from this, simulation upshots for individual amplifiers infer that EDFA shows a high gain of 22.1 dB for co-directional pumping and Raman amplifier deduces a gain of 12.2 dB for counter-directional pumping whereas EDFA-Raman hybrid amplifier bestows a substantial high gain of 23.03 dB for co-directional pumping configuration. Additionally, it has been inferred that the hybrid amplifier offers a very minimal gain ripple of 0.8 dB, which indicates the gain is almost flat. Hence, considering the aforementioned high gain and flat gain characteristics, the suggested EDFA-Raman hybrid amplifier opens up an avenue for future optical dense wavelength division multiplexing systems.