A novel DSP scheme for eliminating the interaction between dispersion and transient frequency offset in optical burst-mode coherent systems

A novel DSP scheme for eliminating the interaction between dispersion and transient frequency offset in optical burst-mode coherent systems
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一种新颖的 DSP 方案,用于消除光突发模式相干系统中色散和瞬态频率偏移之间的相互作用

DOI:
10.1016/j.optcom.2020.126610
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发表时间:
2021-03
影响因子:
2.4
通讯作者:
Sheping Shi
Sheping Shi
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wentao Liu;Tao Yang;Xue Chen;Sheping Shi

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光相干突发模式传输不仅可以提供灵活性,而且可以提高弹性光网络中网络资源利用的效率。我们提出了一种带有训练序列(TS)的相干突发接收的新数字信号处理(DSP)方案,以解决光突发(OB)模式系统中快速变化的瞬态频率偏移(TFO)和光纤色散(CD)补偿之间相互作用引起的均衡收敛问题。通过在 128 Gbps 偏振复用正交相移键控 (PM-QPSK) 相干系统上的仿真和实验,证明 DSP 方案具有良好的性能。由于DSP方案,两个OB之间不再需要保护间隔,并且可以在TFO从波长调谐改变期间传输有效负载。与使用保护间隔相比,所提出的 DSP 方案可以将波长可调 OB 模式相干系统的开销减少约 73%,从而显着提高突发模式系统的频谱效率。
Optical coherent burst-mode transmission can offer not only flexibility but also efficiency of the network resource utilization in elastic optical networks. We propose a new digital signal processing (DSP) scheme of coherent burst reception with a training sequence (TS) to solve the convergence problem of equalization caused by the interaction between fast-changing transient frequency offset (TFO) and fiber chromatic dispersion (CD) compensation in optical burst (OB)-mode systems. The DSP scheme is demonstrated to perform well by the simulation and experimentation on 128 Gbps polarization multiplexing quadrature phase-shift keying (PM-QPSK) coherent systems. Thanks to the DSP scheme, a guard interval between two OBs is no longer needed, and the valid payload can be transmitted during TFO changing from wavelength tuning. The proposed DSP scheme can reduce the overhead by∼ 73% for wavelength-tunable OB-mode coherent systems compared with using guard intervals, which significantly improves the spectral efficiency of burst-mode systems.
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