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

IEEE Access

Mohammad Ahmad Zaki Al-Khateeb¹  Tu Thanh Nguyen¹  Mingming Tan¹  Andrew D. Ellis¹  Tingting Zhang¹  Pawel Rosa² 

[1]Aston Institute of Photonic Technologies, Aston University, Birmingham, U.K.

[2]National Institute of Telecommunications, Warsaw, Poland

关键词: Optical amplifiers;    optical fibre communication;    phase conjugation;    nonlinear optics;   

DOI  :  10.1109/ACCESS.2020.3044525

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown