Combating Fiber Nonlinearity Using Dual-Order Raman Amplification and OPC
Combating Fiber Nonlinearity Using Dual-Order Raman Amplification and OPC
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DOI：
10.1109/lpt.2019.2911131
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发表时间：
2019-06-01
影响因子：
2.6
通讯作者：
Ellis, Andrew D.
中科院分区：
文献类型：
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作者：
Al-Khateeb, Mohammad;Tan, Mingming;Ellis, Andrew D.
我们首次通过实验证明了使用优化的双阶分布式拉曼放大 (DRA) 技术在中间链路光学相位共轭 (OPC) 系统中实现显着的 34dB 非线性乘积功率补偿。双阶后向 (BW) 泵浦方案在 50.4 公里单模光纤 (SMF) 跨度上显示出创纪录的 97% 信号功率对称性。我们还证明，为了保持 20 dB 非线性产品补偿，跨度功率对准所需的精度在 +/- 1 dB 之内。对于采用中间链路 OPC 的 100.8 km (2 x 50.4 km) SMF 上的 256 Gb/s 双极化 16 QAM 传输，与没有 OPC 的系统相比，所提出的拉曼放大方案使 OPC 能够将非线性阈值提高约 7 dB，将最佳信号发射功率提高约 5 dB。
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 x 50.4 km) SMF with mid-link OPC, the proposed Raman amplification scheme enables the OPC to improve the nonlinear threshold by similar to 7 dB and the optimum signal launch power by similar to 5 dB compared with the system without OPC.