基于啁啾管理激光器的直接调制RZ-DPSK信号产生技术研究  

Direct Modulation RZ-DPSK Signal Generation Technology Based on Chirp-Managed Lasers

作　　者：马榕 高铎瑞 魏森涛 谢壮 汪伟[1,2] 郏帅威 白兆峰 谢小平[1,2,3] Ma Rong;Gao Duorui;Wei Sentao;Xie Zhuang;Wang Wei;Jia Shuaiwei;Bai Zhaofeng;Xie Xiaoping(Laboratory of Photonics and Network,Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences,Xi'an 710119,Shaanxi,China;State Key Laboratory of Transient Optics and Photonics Technology,Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences,Xi'an 710119,Shaanxi,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所光子网络技术研究室,陕西西安710119 [2]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119 [3]中国科学院大学,北京100049

出　　处：《中国激光》2022年第13期77-83,共7页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFC0307904)。

摘　　要：利用啁啾管理激光器的啁啾效应实现了光信号的直接相位调制,无需差分编码,也无需外部调制器。分析了利用频率啁啾产生归零差分相移键控(RZ-DPSK)光信号的原理,搭建了基于啁啾管理激光器的2.5 Gb/s RZ-DPSK激光通信系统,同时将该系统与基于LiNbO_(3)外调制的通信系统进行了性能对比。实验结果表明:当前向纠错极限误码率为10^(-3)时,直接调制RZ-DPSK系统的接收灵敏度为-48.1 dBm,与传统外调制方式的灵敏度相当,而且该系统可以有效降低发射端的体积和功耗,结构也更加简单紧凑。Objective Due to its bandwidth advantage,space laser communication has become an effective means to solve the bottleneck of microwave communication,build a space-based broadband network,and realize the real-time transmission of massive amount of earth observation data.The space laser communication terminal has characteristics of small size,lightweight,low power consumption,etc.,which are suitable for satellite payload and meet the increasing communication needs of aerospace activities.In future,each communication satellite will carry multiple laser communication terminals that can serve multiple targets simultaneously.Therefore,laser communication terminals are being developed in the direction of miniaturization and integration.Traditional laser communication terminals use external modulation methods to achieve intensity or phase modulation of optical signals.Optical transmitters comprise multiple independent components,such as lasers,modulators,and bias controllers,and the system’s structure is complex.The phase modulation of the optical signal is realized using the direct modulation of the chirp-managed laser(CML),without an external modulator,bias controller,etc.,with small size,low power consumption,low equipment complexity,and low cost.In addition,it can adapt to the continuous,high-speed,and integrated development of optical communication networks.Methods In this study,the chirp effect of the CML is used for phase modulation to generate a return-to-zero differential phase shift keying(RZ-DPSK)signal.RZ-DPSK has several advantages,such as high sensitivity,good reliability,simple receiver,and its receiving sensitivity is 3 dB higher than that of on-off keying(OOK)modulation method.It has received extensive attention in the engineering field.Using the chirp effect of the laser,the phase shift of the optical field is achieved by controlling the magnitude of the injected current,and the driving signal is simply pre-encoded using MATLAB to generate a three-level signal,thereby accurately controlling the phase c

关 键 词：光通信 啁啾管理激光器 啁啾效应 相位调制 归零差分相移键控 

分 类 号：TN929.1[电子电信—通信与信息系统]