Improved WDM performance of a fibre optical parametric amplifier using Raman-assisted pumping

M.F.C. Stephens, I.D. Phillips, P. Rosa, P. Harper, N.J. Doran

Research output: Contribution to journalArticle


We experimentally demonstrate a Raman-Assisted Fibre Optical Parametric Amplifier (RA-FOPA) with 20dB net gain using wavelength division multiplexed signals. We report amplification of 10×58Gb/s 100GHz-spaced QPSK signals and show that by appropriate tuning of the parametric pump power and frequency, gain improvement of up to 5dB can be achieved for the RA-FOPA compared with combined individual contributions from the parametric and Raman pumps. We compare the RAFOPA with an equivalent-gain conventional FOPA and find that four-wave mixing crosstalk is substantially reduced by up to 5.8 ± 0.4dB using the RA-FOPA. Worst-case performance penalty of the RA-FOPA is found to be only 1.0 ± 0.2dB over all measured OSNRs, frequencies and input powers, making it an attractive proposal for future communications systems.

Original languageEnglish
Pages (from-to)902-911
Number of pages10
JournalOptics Express
Issue number2
Publication statusPublished - 14 Jan 2015


Bibliographical note

Funding: UK EPSRC under grant EP/J009709/2.

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