High Gain, Low Noise, Spectral-Gain-Controlled, Broadband Lumped Fiber Raman Amplifier
Sijing Liang, Saurabh Jain, Lin Xu, Kyle R. H. Bottrill, Natsupa Taengnoi, Massimiliano Guasoni, Peng Zhang, Mengben Xiao, Qiongyue Kang, Yongmin Jung, Periklis Petropoulos, David J. Richardson
Abstract
We demonstrate an 80 nm bandwidth (extending from 1529 to 1609 nm), dual-stage, diode-pumped, lumped Raman amplifier using a relatively short total length (2 km) of highly nonlinear fiber. The impact of Rayleigh back scattering is mitigated and the build-up of thermally generated wavelength dependent noise is controlled by suitably adjusting the spectral gain profile in the two amplifier stages. In this way a high overall gain of 27 dB with 2.6 dB gain flatness and an average noise figure of 5.8 dB with <; 1 dB variation is achieved across the full amplifier bandwidth.