基于FPGA的高速EOM偏压自控系统  

High Speed EOM Bias Voltage Automatic Control System Based on the FPGA

作　　者：高天学 GAO Tianxue(Shandong Huayu University of Technology,Dezhou 253034,China)

机构地区：[1]山东华宇工学院,山东德州253034

出　　处：《现代信息科技》2020年第2期56-58,共3页Modern Information Technology

基　　金：山东华宇工学院科技计划项目(2018KJ09);2019年度德州市市级研发计划项目。

摘　　要：针对偏振式电光调制器在工作时出现的工作点漂移问题,设计数字化偏压自控软硬件系统,使用高速FPGA监测铌酸锂晶体的入射及出射光信号强度并分析,当工作点发生漂移,可根据漂移程度快速调节驱动信号的相位差实现自动化自加自减步进调压来实现对偏置电压的高速控制,具有在线设置和修改参数,显示以及通信功能。最终实验结果表明,采用偏置电压数字化自动控制技术可使电光调制器偏置电压始终位于线性区的中点,以保证不失真调制。Aiming at the problem of the working point drift of the polarization electro-optic modulator,a digital bias automatic control software and hardware system is designed.The high-speed FPGA is used to monitor the input and output light signal intensity of lithium niobate crystal and analyze it.When the working point drifts,the phase difference of the driving signal can be adjusted quickly according to the deviation degree to realize the automatic self adding and self reducing step-by-step voltage regulation to realize the bias electricity high speed control of pressure.It has the functions of online setting and modifying parameters,display and communication.The final experimental results show that the bias voltage of the electro-optic modulator is always at the midpoint of the linear region by adopting the digital automatic control technology of the bias voltage,so as to ensure the distortion free modulation.

关 键 词：电光调制 数字移相 全桥开关 高精度调压 

分 类 号：TN79[电子电信—电路与系统] TP212[自动化与计算机技术—检测技术与自动化装置]