关键词: 多相位, 光通信, 抖动测试, Xilinx

Abstract: According to the needs of high-speed，high-precision jitter measurement on Phase Locked Loop（PLL），based on the single phase Data Transition Tracking Loop（DTTL） of the jitter test model，a new jitter testing algorithm of multi-phase DTTL based on Xilinx chip is proposed.On the basis of these two jitter test models，their respective jitter error expression is compared，and fixed-point simulated using Xilinx chip.Theoretical analysis and simulation results show that，in the case of the same sampling period，compared to the single-phase of jitter measurement accuracy，the multi-phase jitter error of measurement accuracy corresponding increase in multiples.The method eases the clock limits on Xilinx chip，increases SDH jitter measurement accuracy.

Key words: multiphase, optical communication, jitter test, Xilinx