Impact of pump-signal overlap in S+C+L band discrete Raman amplifiers

Md Asif Iqbal, Gabriele Di Rosa, Lukasz Krzczanowicz, Ian Phillips, Paul Harper, André Richter, Wladek Forysiak

Research output: Contribution to journalArticlepeer-review


We experimentally investigate the impact of pump-signal overlap in ultra-wideband (>13THz) Raman amplifiers and measure the transmission penalty on 30GBaud PM-QPSK signals due to adjacent Raman pumps in a 15dB gain, 150nm (∼18.8THz) S+C+L-band discrete Raman amplifier. We present an efficient numerical model to predict the performance penalty induced by crosstalk from Rayleigh backscattered light from backward-propagating Raman pumps showing good agreement with the experimental results. A 4nm guard-band must be retained around an overlapping Raman pump based on typical, commercial semiconductor laser pump diodes to ensure a negligible transmission penalty in S-band
Original languageEnglish
Article number18440
Pages (from-to)18440-18448
Number of pages9
JournalOptics Express
Issue number12
Publication statusPublished - 5 Jun 2020

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Published by The Optical Society 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.


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