Combined serial parallel hybrid fiber amplifier with high order raman scattering

A combined serial parallel hybrid fiber amplifier (CSP-HFA) is enhanced using high order Raman scattering. All the result concluded in this paper are simulated via Optisystem 14. The proposed HFA consist of two Raman fiber amplifiers (RFAs) and Erbium doped fiber amplifier (EDFA). RFA1 is pumped by two Raman pump units (RPUs) with different wavelengths of 1410 nm and 1495 nm. While RFA2 is pumped by 1480 nm is pumped by the residual pump power of the second RFA pump unit. The proposed amplifier setup shows broadly gain flatness that covers short band (S-band), conventional band (C-band) and long band (L-band). The overall gain is tested under different input power ratio inserted to the amplifiers branch. With an input power ratio of 0.8:0.2, at small input signal power of -25 dBm the overall gain flatness of 95 nm (1525 nm-1620 nm) and 19 dB as average gain are recorded. For high input signal power of -15 dBm; different input power ratio of 0.4:0.6 are used to achieve wide overall gain of 85 nm (1530 nm- 1615 nm) and 17 dB average gain level.