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Improved carrier phase estimation algorithms for optical coherent systems

机译:光学相干系统的改进载波相位估计算法

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To enhance the performance of Viterbi-Viterbi phase estimation for optical coherent transmission systems, two effective approaches are investigated in this paper, as adding one stage of normalization and using weighted average filter in the algorithm. The simulation results for QPSK, 8PSK and 16-QAM show that: (1) Triangle window can enlarge the range of permitted block length over 1.5 times in VVPE for three modulation formats, which means the ability of adaptive is enhanced for receiver with respect to laser linewidth; (2) Improved algorithm achieves smaller SNR penalty due to laser phase noise. For the linewidth per laser of 9MHz (QPSK), 2MHz (8PSK), and 1MHz (square 16-QAM), the SNR penalty is 0.8dB.
机译:为了提高光相干传输系统的维特比-维特比相位估计的性能,本文研究了两种有效的方法,即增加一个标准化阶段并在算法中使用加权平均滤波器。 QPSK,8PSK和16-QAM的仿真结果表明:(1)三角形窗口可以在三种调制格式的VVPE中将允许的块长度范围扩大到1.5倍以上,这意味着针对接收器,自适应能力得到了增强激光线宽(2)改进的算法由于激光相位噪声而实现了较小的SNR损失。对于9MHz(QPSK),2MHz(8PSK)和1MHz(平方16-QAM)的每个激光器的线宽,SNR损失为0.8dB。

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