Low-complexity and modulation-format-independent carrier phase estimation scheme using linear approximation for elastic optical networks
Low-complexity and modulation-format-independent carrier phase estimation scheme using linear approximation for elastic optical networks
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DOI：
10.1016/j.optcom.2017.10.052
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发表时间：
2018-03
影响因子：
2.4
通讯作者：
Tao Yang;Xue Chen;Sheping Shi;Erkun Sun;Chen Shi
中科院分区：
文献类型：
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作者：
Tao Yang;Xue Chen;Sheping Shi;Erkun Sun;Chen Shi
针对弹性光网络（EONs）中任意m元正交幅度调制（m-QAM）信号的相位噪声，提出了一种基于两级线性近似修正盲相位搜索（MBPS）的低复杂度、与调制格式无关的载波相位估计（CPE）方法.在EONS中最高可能的调制格式是256-QAM的情况下进行了全面的数值模拟。仿真结果不仅验证了其估计精度高、与调制格式无关的优点，的通用性，而且还表明，实施复杂性显着降低了至少四分之一，与传统的BPS方案相比。此外，该方案显示出类似的激光线宽容限与传统的BPS方案。该方案的OSNR性能稍好，也分别为PM-QPSK和PM-16 QAM系统的实验验证。低复杂度和调制格式无关性的并存优势使该方案成为EONS中灵活的接收侧DSP单元的有吸引力的候选者。
We propose a low-complexity and modulation-format-independent carrier phase estimation (CPE) scheme based on two-stage modified blind phase search (MBPS) with linear approximation to compensate the phase noise of arbitrary m-ary quadrature amplitude modulation (m-QAM) signals in elastic optical networks (EONs). Comprehensive numerical simulations are carried out in the case that the highest possible modulation format in EONs is 256-QAM. The simulation results not only verify its advantages of higher estimation accuracy and modulation-format independence, i.e., universality, but also demonstrate that the implementation complexity is significantly reduced by at least one-fourth in comparison with the traditional BPS scheme. In addition, the proposed scheme shows similar laser linewidth tolerance with the traditional BPS scheme. The slightly better OSNR performance of the scheme is also experimentally validated for PM-QPSK and PM-16QAM systems, respectively. The coexistent advantages of low-complexity and modulation-format-independence could make the proposed scheme an attractive candidate for flexible receiver-side DSP unit in EONs.