Bandwidth Extension in a Mid-Link Optical Phase Conjugation

Paweł Rosa*, Giuseppe Rizzelli Martella, Mingming Tan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate various designs of distributed Raman amplifier (DRA) to extend amplification bandwidth in mid-link optical phase conjugation (OPC) systems and compare bands 191−197 THz and 192−198 THz giving a total bandwidth of 6 THz using a single wavelength pump. We demonstrate the use of highly reflective fiber Bragg grating (FBG) to minimize gain variation across a WDM grid by optimizing forward and backward pump powers as well as the wavelength of FBGs for original and conjugated channels. Finally, we also simulate OSNR and Kerr nonlinear reduction as a product of signals asymmetry and nonlinear phase shift (NPS) for all channels.
Original languageEnglish
Article number6385
Pages (from-to)e6385
Number of pages11
Issue number17
Early online date24 Aug 2022
Publication statusPublished - 24 Aug 2022

Bibliographical note

© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).

This research was funded by a UK Engineering and Physical Sciences Research Council (EPSRC) Grant (ARGON), a Royal Society International Exchange Grant (IEC\NSFC\211244), the Aston Impact Fund, and a Polish Ministry of Science and Higher Education Grant (12300051).


  • Raman amplification
  • optical fiber communications
  • optical phase conjugation


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