Performance evaluation of discrete Raman amplifiers in coherent transmission systems

Pratim Hazarika*, Mingming Tan, Md Asif Iqbal, Ian Phillips, Paul Harper, Jeffery S. Stone, Ming Jun Li, Wladek Forysiak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We evaluate the performance penalty due to discrete Raman amplifier (DRA) in a long haul WDM transmission system. The investigation was primarily performed to study the impact of the accumulated nonlinear noise due to fibre chromatic dispersion and nonlinear coefficient(γ). Nonlinear fibres such as inverse dispersion fibre (IDF), dispersion compensation fibre (DCF) and a development fibre known as the Corning Raman fibre (CRF) with the opposite sign of CD to the other two, were taken as the gain fibre in the DRA stage of the long-haul transmission setup. To study the performance penalty with these Raman gain fibres a 30 GBaud 120 Gb/s DP-QPSK channel @1550 nm was combined with 9 spectrally shaped 50 GHz amplified spontaneous emission (ASE) channels for transmission over a recirculation loop with a per loop length of 63 km single mode fibre (SMF). Our modelling and experimental results show that a fibre with positive dispersion >10ps/nm/km and a nonlinear coefficient of ∼ 4W−1km−1 is a good choice of gain fibre for DRA-assisted coherent transmission system.

Original languageEnglish
Pages (from-to)43053-43061
Number of pages9
JournalOptics Express
Issue number24
Publication statusPublished - 21 Nov 2022

Bibliographical note

© 2022. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Funding Information
H2020 Marie Skłodowska-Curie Actions (814276); Engineering and Physical Sciences Research Council (EP/V000969/1); Engineering and Physical Sciences Research Council (EP/M009092/1).


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