基于四次方相位检测器的突发模式定时恢复用于无源光网络

中文摘要 AI 辅助

受不断增长的容量需求驱动，50G无源光网络（50G-PON）已准备投入实际应用。实现50GHz突发模式模拟元件极具挑战性；因此，基于25GHz突发模式模拟器件，引入突发模式数字信号处理（DSP）以实现50Gb/s开关键控突发信号的接收与处理。为优化DSP芯片的功耗和面积，50G-PON中采用了每符号单采样（1-SPS）模数转换器。主要挑战之一是在50G-PON中为1-SPS突发信号实现突发模式定时恢复（BM-TR）。本文首次提出一种基于四次方相位检测器（4PPD）的BM-TR用于50G-PON。我们从数学上验证了4PPD无需训练序列即可直接从1-SPS信号计算定时相位偏移（TPO），从而允许在20个周期内立即初始化BM-TR，以避免长时间收敛。初始化后，反馈环路结构基于4PPD的符号、环路滤波器和数控振荡器跟踪TPO变化。总之，基于4PPD的无训练序列BM-TR通过快速收敛实现低突发开销，特别适用于处理50G-PON中的突发信号。

英文摘要

Driven by the ever-increasing capacity demands, 50G passive optical network (50G-PON) is ready for practical application. It is highly challenging to realize 50GHz burst-mode analog components; therefore, based on 25GHz burst-mode analog devices, burst-mode digital signal processing (DSP) is introduced to achieve the reception and processing of 50Gb/s on-off keying burst signals. To optimize the power consumption and area of the DSP chip, a one-sample-per-symbol (1-SPS) analog-to-digital converter has been applied in 50G-PON. One of the main challenges is implementing burst-mode timing recovery (BM-TR) for the 1-SPS burst signal in 50G-PON. In this paper, we first propose a BM-TR based on the fourth-power phase detector (4PPD) for 50G-PON. We mathematically verify that 4PPD can directly compute the timing phase offset (TPO) from the 1-SPS signal without using training sequences, allowing for immediate BM-TR initialization within 20 cycles to prevent long convergence times. After the initialization, the feedback loop structure tracks the TPO changes based on the sign of 4PPD, the loop filter, and the numerically controlled oscillator. In conclusion, training-sequence-free 4PPD-based BM-TR achieves low burst overhead via fast convergence and is particularly effective for handling burst signals in 50G-PON.

发表机构

• Beijing Institute of Technology, Zhuhai（北京理工大学（珠海））
• Guangdong Polytechnic Normal University（广东技术师范大学）
• China Mobile Communications Corporation Group Co. Ltd（中国移动通信集团有限公司）
• The Hong Kong Polytechnic University（香港理工大学）

机构由 AI 辅助整理，请以论文原文为准。