3×3耦合器解调过程中的偏振分析与处理

刘俊承; 张自超; 余波; 高峰

doi:doi:10.3788/gzxb20194801.0106002

光子学报, 2019, 48 (1): 0106002, 网络出版: 2019-01-27

3×3耦合器解调过程中的偏振分析与处理

Polarization Analysis and Processing in Demodulation Process of 3×3 Coupler

论文大纲

刘俊承 ^*张自超余波高峰

作者单位

华北电力大学控制与计算机工程学院, 北京 102206

光纤研究信号处理 3×3耦合器偏振衰落马赫-增德尔干涉仪 Optical fiber research Signal processing 3×3 coupler Polarization fading Mach-Zehnder interferometers

摘要

针对马赫曾德光纤干涉结构的信号解调, 理论分析了偏振衰落对3×3耦合器解调的影响, 发现椭圆拟合估计法解调的关键是准确获取信号李萨如图形的椭圆表达式, 从而提出了基于形态学滤波的偏振处理方法, 即利用腐蚀和膨胀滤除椭圆图形中的噪声点, 然后用边缘检测方法提取椭圆外轮廓, 再用最小二乘数值估计方法求解椭圆参数, 最后利用微分交叉相乘方法完成扰动信号的相位还原.仿真结果和现场实验数据证明该方法切实有效, 与传统偏振处理方法相比, 节省了硬件开支, 有效提高了信号解调的稳定性和精确度.

Abstract

In view of the signal demodulation of the Mach-Zehnder fiber optic interference structure, the influence of polarization fading on the demodulation of the 3×3 coupler is theoretically analyzed. It is found that the key to the demodulation of the ellipse fitting estimation method is to accurately obtain the elliptic expression of signal Lissajous figure. A polarization processing method based on morphological filtering is proposed, which uses the erosion and expansion to filter out the noise points in the elliptic pattern, then uses the edge detection method to extract the elliptical outer contour, and then uses the least squares numerical estimation method to solve the ellipse. And finally the differential cross-multiplication method is used to complete the phase reduction of the disturbance signal. The simulation results and field experimental data prove that the method is effective and effective. Compared with the traditional polarization processing method, the cost is saved, and the stability and accuracy of signal demodulation are effectively improved.

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刘俊承, 张自超, 余波, 高峰. 3×3耦合器解调过程中的偏振分析与处理[J]. 光子学报, 2019, 48(1): 0106002. LIU Jun-cheng, ZHANG Zi-chao, YU Bo, GAO Feng. Polarization Analysis and Processing in Demodulation Process of 3×3 Coupler[J]. ACTA PHOTONICA SINICA, 2019, 48(1): 0106002.

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