论文标题
CD和PMD对光学连贯接收器的基于环固醇的时间恢复的影响
CD and PMD Effect on Cyclostationarity-Based Timing Recovery for Optical Coherent Receivers
论文作者
论文摘要
时间恢复对于在数字连贯通信系统的传输和接收端同步时钟至关重要。定时恢复的核心是可靠地确定本地数字化器的当前采样误差，以便计时电路可以锁定到稳定的操作点。常规的定时相检测器需要适应光纤通道，因此必须了解该通道的常见效应，例如色散（CD）和极化模式分散（PMD），必须在定时阶段提取上进行理解。在这里，我们利用光学信号的环化性，并得出用于研究CD和PMD效应的模型。我们证明，CD调整后的循环相关矩阵包含有关定时和PMD的完整信息，并且矩阵的决定因素是对CD和PMD免疫的定时相位检测器。我们还获得了其他结果，例如完全独立于PMD的CD估计器等。我们的分析得到了实现的光学电缆的模拟和实验的支持。
Timing recovery is critical for synchronizing the clocks at the transmitting and receiving ends of a digital coherent communication system. The core of timing recovery is to determine reliably the current sampling error of the local digitizer so that the timing circuit may lock to a stable operation point. Conventional timing phase detectors need to adapt to the optical fiber channel so that the common effects of this channel, such as chromatic dispersion (CD) and polarization mode dispersion (PMD), on the timing phase extraction must be understood. Here we exploit the cyclostationarity of the optical signal and derive a model for studying the CD and PMD effect. We prove that the CD-adjusted cyclic correlation matrix contains full information about timing and PMD, and the determinant of the matrix is a timing phase detector immune to both CD and PMD. We also obtain other results such as a completely PMD-independent CD estimator, etc. Our analysis is supported by both simulations and experiments over a field implemented optical cable.
