Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 5, Pages 1458-1463Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3034678
Keywords
Gain; Optical fiber amplifiers; Noise measurement; Stimulated emission; Optical fiber dispersion; Bandwidth; Broadband amplifiers; low-noise amplifiers; lumped Raman amplifiers; optical fiber communication
Funding
- Hisilicon Optoelectronics Co. Ltd.
- European Research Council under the H2020 Programme [802682]
- European Research Council (ERC) [802682] Funding Source: European Research Council (ERC)
- EPSRC [EP/S028854/1] Funding Source: UKRI
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An 80 nm bandwidth dual-stage diode-pumped lumped Raman amplifier with a short length of highly nonlinear fiber is demonstrated, achieving a high overall gain of 27 dB. By adjusting the spectral gain profile in the two amplifier stages, Rayleigh back scattering impact is mitigated and thermally generated noise is controlled, resulting in an average noise figure of 5.8 dB with <1 dB variation across the full amplifier bandwidth.
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.
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