Combating Fiber Nonlinearity Using Dual-Order Raman Amplification and OPC

Research output: Contribution to journalArticle

Abstract

We experimentally demonstrate, for the first time, a significant 34-dB nonlinear product power compensation in a mid-link optical phase conjugation (OPC) system using an optimized dual-order distributed Raman amplification (DRA) technique. The dual-order backward (BW)-pumping scheme shows a record signal power symmetry of 97% over 50.4-km single-mode fiber (SMF) spans. We also demonstrate that the required accuracy for span-to-span power alignment is within ±1 dB in order to maintain 20-dB nonlinear product compensation. For a 256-Gb/s dual-polarization-16 QAM transmission over 100.8 km (2×50.4 km) SMF with mid-link OPC, the proposed Raman amplification scheme enables the OPC to improve the nonlinear threshold by 7 dB and the optimum signal launch power by 5 dB compared with the system without OPC.

Original languageEnglish
Pages (from-to)877-880
Number of pages4
JournalIEEE Photonics Technology Letters
Volume31
Issue number11
Early online date15 Apr 2019
DOIs
Publication statusPublished - 1 Jun 2019

Bibliographical note

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Funding: This work was supported by the U.K. EPSRC Programme
under Grant EP/L000091/1 (PEACE) and Grant EP/S003436/1 (PHOS).

Keywords

  • Optical amplifiers
  • nonlinear optics
  • optical fiber communication
  • phase conjugation

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