Hazarika Pratim, Tan Mingming, Iqbal Md Asif, Krzczanowicz Lukasz, Ali Abdallah A I, Phillips Ian, Harper Paul, Forysiak Wladek
Opt Express. 2021 Sep 27;29(20):32081-32088. doi: 10.1364/OE.439406.
Relative intensity noise (RIN) induced penalties were experimentally measured in distributed Raman amplifiers (DRAs) for G.654.E and G.652.D fibres with forward, backward and bidirectional pumping configurations. The measured signal RIN using the G.654.E fibre was ∼3.5 dB and ∼2 dB lower than the G.652.D fibre with forward (FW) pump configuration for PM-QPSK and PM-8QAM signals, with single span transmission showing a Q-factor improvement of ∼3 dB and ∼2.5 dB for G.654.E over G.652.D fibres. The performance penalty in a long haul coherent system was evaluated for 28 GBaud PM-QPSK signals using a recirculation loop for backward and bidirectional distributed Raman amplifiers. Our experimental results demonstrate an additional transmission distance of more than 1000 km for G.654.E over its counterpart G.652.D assuming a HD-FEC limit of 8.5 dB.
针对采用前向、后向和双向泵浦配置的G.654.E光纤和G.652.D光纤，在分布式拉曼放大器（DRA）中通过实验测量了相对强度噪声（RIN）引起的代价。对于偏振复用正交相移键控（PM-QPSK）和偏振复用8正交幅度调制（PM-8QAM）信号，采用前向（FW）泵浦配置时，使用G.654.E光纤测得的信号RIN比G.652.D光纤低约3.5 dB和2 dB，单跨距传输显示G.654.E光纤的Q因子比G.652.D光纤提高了约3 dB和2.5 dB。使用后向和双向分布式拉曼放大器的再循环环路，对28 GBaud的PM-QPSK信号在长距离相干系统中的性能代价进行了评估。我们的实验结果表明，假设高清前向纠错（HD-FEC）限制为8.5 dB，G.654.E光纤比其对应的G.652.D光纤的额外传输距离超过1000 km。
