一种可用于高阶调制格式的自动偏压控制技术  

An Automatic Bias Voltage Control Technique for High-order Modulation Formats

作　　者：黄嘉琦 金鑫 吴金洋 王元祥[2] 杨奇 戴潇潇 HUANG Jia-qi;JIN Xin;WU Jin-yang;WANG Yuan-xiang;YANG Qi;DAI Xiao-xiao(School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China;School of Cyber Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学光学与电子信息学院,武汉430074 [2]华中科技大学网络空间安全学院,武汉430074

出　　处：《光通信研究》2022年第6期22-26,共5页Study on Optical Communications

基　　金：国家重点研发计划资助项目(2018YFB1801303)。

摘　　要：为了维持发射机的稳定,以保证输出信号的质量,文章提出了一种新型的基于导频的自动偏压控制方案,可用于高阶调制格式。文章所提方案要求向调制器加载正交导频,并将经过移频的本振光与调制器输出的信号光相拍以实现相干探测。通过相关运算并监测相关系数值的方式,实现对偏置电压的控制。此方案将相干探测和相关检测技术结合,可有效提高系统的灵敏度,并通过仿真对此方案在高阶调制系统中的可行性以及对灵敏度的提升进行了充分验证。In order to maintain the stability of the transmitter to ensure the quality of the output signal, we propose a novel technique of automatic bias control based on the pilot signal that can be used in high-order modulation formats. The proposed scheme requires loading a pair of orthogonal pilot signals to the modulator and tapping the frequency-shifted local oscillation light with the signal light output from the modulator to achieve coherent detection. The control of the bias voltage is achieved by means of correlation operation and monitoring the value of the correlation coefficient. This scheme combines coherent detection and correlation detection techniques, which can effectively improve the sensitivity and control accuracy of the system. The feasibility of this scheme in high-order modulation systems and the improvement of sensitivity are also fully verified by simulation.

关 键 词：同相正交调制器 偏压控制 高阶调制 相关检测 相干探测 

分 类 号：TN929[电子电信—通信与信息系统]