基于加权表决的POF信号时钟数据恢复方法

摘要

针对POF数据传输特点,提出了一种基于加权表决的全数字时钟数据恢复(CDR)方法.引入数据窗口,消除了传统数字CDR电路中存在的恢复时钟1/N UI峰峰抖动,运用加权表决恢复数据,增强了电路抗干扰能力.该方法基于FPGA通过单PLL实现了100Mb/s的POF数据传输.仿真和实验测试结果表明,该方法可快速同步相位变化,电路输入抖动容限可达0.28UI.%To meet plastic optical fiber data transmission requirements, an all-digital over-sampling CDR method base on weighted voting was presented. By using data window the 1/N UI recovery clock peak jitter, which existed in traditional digital CDR circuit, could be eliminated. Data recovery was achieved by weighted voting to enhance anti-interference capability of the circuit. The method realized l00Mb/s plastic optical fiber data transmission using one single PLL in FPGA. Simulation and experiment results indicate that the method is effective to synchronize rapid phase variation, and the input jitter tolerance of the circuit is up to 0.28UI.