光子学报, 2016, 45 (8): 0806002, 网络出版: 2016-09-12
一种用于光线性采样的载波相位估计算法
A Phase Estimation Algorithm for Optical Linear Sampling
相干光通信 线性采样 正交幅度调制 数字信号处理 载波相位噪声 Optical coherent communication Optical linear sampling Quadrature amplitude modulation Digital signal processing Carrier phase noise
摘要
提出了一种改进的相位盲搜索算法, 该算法通过两次寻找二次最小欧拉距离得到载波相位噪声的估计值.为验证该算法, 搭建了一套光线性采样仿真系统, 对符号率为10 Gbaud/s 的16QAM光调制信号的星座图进行了测量, 采样源为脉宽为500 fs、周期为10 ns的光频梳.仿真结果表明, 当两个激光器线宽和小于10MHz时, 经过该算法对相位噪声进行补偿后, 10G-Gb/s 的16QAM信号的星座图能够清晰展示.
Abstract
An improved Blind Phase Search algorithm was proposed. In this algorithm, carrier phase noise was estimated by searching minimum Euler distance twice. To verify this algorithm, an optical linear sampling simulation system was set up. The constellation diagram of 10Gbaud/s 16QAM signal was simulated by using an optical frequency comb with pulse width of 500fs and duration of 10ns as optical sampling source. The simulation result shows that, the phase noise between the signal source and optical sampling source can be compensated effectively by this algorithm when the sum linewidth of the two lasers is less than 10MHz. Finally, the constellation diagram of 10Gbaud/s 16QAM signal is displayed clearly.
李飞涛, 赵卫, 刘元山. 一种用于光线性采样的载波相位估计算法[J]. 光子学报, 2016, 45(8): 0806002. LI Fei-tao, ZHAO Wei, LIU Yuan-shan. A Phase Estimation Algorithm for Optical Linear Sampling[J]. ACTA PHOTONICA SINICA, 2016, 45(8): 0806002.