Enhancing the Signal Power Symmetry for Optical Phase Conjugation Using Erbium-Doped-Fibre-Assisted Raman Amplification

Abstract

We propose a novel dual-order backward-pumped distributed Raman amplification scheme assisted erbium-doped-fibre (EDF) providing nearly perfect signal power symmetry (>93% symmetry level) over two 50.4 km single mode fibre spans. Compared with conventional dual-order Raman schemes, this scheme only requires an additional short (25 cm) erbium-doped fibre to compensate the loss from the passive components between spans, significantly improving the overall link symmetry. Unlike a conventional hybrid Raman/EDFA approach with separate amplifier modules, the proposed scheme offers cost savings by utilizing the Raman pumps to activate the erbium-doped fibre, avoiding the need for an EDF-designated pump. In an optical transmission system with four 50.4 km fibre spans, our novel Raman scheme presented in this paper enables mid-link optical phase conjugation (OPC) to compensate up to 37 dB of nonlinear Kerr inter-signal interference. This represents a 12 dB advantage in compensation over conventional dual-order Raman amplification. Our experimental and simulated results also demonstrate that the proposed configuration provides 7 dB nonlinear threshold enhancement in a 200 Gb/s DP-16QAM 200 km inline transmission system using a mid-link OPC, exceeding the enhancement observed with the conventional dual-order Raman scheme. Our simulation results also show that the optimum Q2 factor using the proposed scheme outperforms the conventional schemes at 2000 km.

Publication DOI: https://doi.org/10.1109/ACCESS.2020.3044525
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Electrical and Electronic Engineering
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ Funding: EU MSCA, GRANT 748767; Engineering and Physical Sciences Research Council EP/S003436/1
Uncontrolled Keywords: Optical amplifiers,nonlinear optics,optical fibre communication,phase conjugation,Computer Science(all),Materials Science(all),Engineering(all)
Publication ISSN: 2169-3536
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Related URLs: https://ieeexpl ... rce=SEARCHALERT (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-12-14
Accepted Date: 2020-12-01
Authors: Tan, Mingming (ORCID Profile 0000-0002-0822-8160)
Nguyen, Thanh Tu (ORCID Profile 0000-0003-1683-5734)
Rosa, Paweł
Al-Khateeb, Mohammad
Zhang, Tingting (ORCID Profile 0000-0002-3901-6267)
Ellis, Andrew D. (ORCID Profile 0000-0002-0417-0547)

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