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首页> 外文期刊>IEEE communications letters >Phase Noise Tracking and Compensation in Coherent Optical Systems Using Kalman Filter
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Phase Noise Tracking and Compensation in Coherent Optical Systems Using Kalman Filter

机译：使用卡尔曼滤波器的相干光学系统中的相位噪声跟踪和补偿

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摘要

The performance of phase-modulated coherent optical communication systems is often limited by laser and nonlinear phase noises (PN and NLPN). The laser PN and the NLPN at high launch powers degrade system performance severely. In this letter, we investigate the use of Kalman filter (KF) to estimate and track both the laser PN and the NLPN in 100-Gb/s single channel coherent optical phase-modulated systems. Initially, the KF is operated in the training mode with pilot symbols; the filter is switched to decision directed mode after training. Simulation results for single-polarization, 100-Gb/s QPSK transmission over km fiber with in-line dispersion compensation show that KF can successfully mitigate NLPN at 8-dBm launch power with 1-MHz laser linewidth. Comparison with digital backpropagation algorithm (one step/span) shows that KF provides 6-dB improvement in -factor. Kalman estimates corresponding to the time evolution of PN and NLPN are also provided, which shows optimal tracking of both the noise processes, thereby validating our proposed scheme.
机译：相位调制相干光通信系统的性能通常受到激光和非线性相位噪声（PN和NLPN）的限制。高发射功率的激光PN和NLPN严重降低了系统性能。在这封信中，我们研究了在100 Gb / s单通道相干光相位调制系统中，使用卡尔曼滤波器（KF）估计和跟踪激光PN和NLPN的情况。最初，KF在带有飞行员符号的训练模式下运行；训练后，滤波器将切换到决策指导模式。在具有在线色散补偿的km光纤上单极化100 Gb / s QPSK传输的仿真结果表明，KF可以成功地缓解8 dBm发射功率下的NLPN和1 MHz激光线宽的情况。与数字反向传播算法（一个步长/跨度）的比较表明，KF可将因子提高6 dB。还提供了与PN和NLPN的时间演变相对应的Kalman估计，该估计显示了两个噪声过程的最佳跟踪，从而验证了我们提出的方案。

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