基于自由空间光和光纤混合链路的多业务传输系统  

Multi-Service Transmission System Based on a Free-Space Optical andOptical Fiber Hybrid Link

作　　者：梁红霞 郑耿鑫 谢少武 曾昶盛 钟永明 甘园园 熊永康 韩一石[1] Liang Hongxia;Zheng Gengxin;Xie Shaowu;Zeng Changsheng;Zhong Yongming;Gan Yuanyuan;Xiong Yongkang;Han Yishi(School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China)

机构地区：[1]广东工业大学信息工程学院,广东广州510006

出　　处：《中国激光》2024年第5期99-108,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(61471130);广东省重点领域研发计划项目(2019B010138004)。

摘　　要：本文提出了一种基于自由空间光和光纤混合链路的双向双输出多业务传输系统。在单光源条件下,该系统的下行链路可同时传输10 GHz的16PSK微波业务信号和60 GHz的4QAM-OFDM毫米波业务信号,上行链路可同时传输OOK基带业务信号和20 GHz的16QAM微波业务信号,实现了双向双输出而且可以应用于多通道。下行接收端采用自相干检测技术,光路干涉匹配良好时能够有效避免激光相位波动的影响,提高系统的接收灵敏度。采用波长重用和偏振复用技术可以实现上行传输的无光源化,为用户同时提供有线与无线的多元化服务。仿真结果表明:经600 m自由空间光和30 km光纤混合链路传输后,上行20 Gbit/s OOK输出信号的误码率远小于10-9,同速率的上行16QAM信号和下行16PSK、4QAM-OFDM数据信号的误差矢量幅度值均小于3.1%。仿真结果说明所提系统具有较好的性能表现。此外,还分析了晴天、小雾、大雾、小雨和大雨多种天气变化因素对多业务传输系统性能的影响。Objective The traditional passive optical network(PON)architecture faces the problem of difficult fiber deployment.To overcome this problem,free-space optical(FSO)communication technologies have emerged.FSO technology uses a laser as the carrier and an atmospheric channel as the transmission medium,providing a high transmission rate and enabling easy installation.To reduce the construction complexity of PON access systems based on FSO links,wavelength reuse technology is used to realize colorless uplink transmission of the optical network unit(ONU).However,the currently proposed schemes based on devices such as Fabry-Perot laser diodes(FPLDs)and reflective semiconductor optical amplifiers(RSOAs)for wavelength reuse limit the bandwidth of the system.To improve system bandwidth,some scholars have proposed the use of polarization multiplexing technology to realize wavelength reuse,thus entailing the construction of a single light source system.However,system service is singular and cannot meet the diverse needs of users of future broadband access systems.Therefore,researchers have proposed combining multiple services into a single shared infrastructure to enhance system practicality.Nevertheless,these solutions can only achieve one-way multiservice transmission and require complex devices(such as FPLD and RSOA)to achieve colorless ONUs and optical filters to achieve wavelength separation,which severely limits the frequency-adjustment range of the system.In this study,a bidirectional dual-output multiservice transmission system based on an FSO and optical fiber hybrid link is proposed.This system has broad application prospects in broadband wireless communication systems.Under the single-light-source condition,the system can realize the transmission of downlink microwave and millimeter-wave services,as well as the transmission of uplink baseband and microwave services.Simultaneously,the system can be expanded and integrated into a wavelength-division multiplexing(WDM)PON architecture.By simply adjusting the polarizer

关 键 词：光通信 多业务 双向双输出 单光源 自相干检测 偏振复用 

分 类 号：TN29[电子电信—物理电子学]