50 Gbit/s PON高性能接收技术的研究  

Research on High Performance Receiving Technology of 50 Gbit/s PON

作　　者：张蕾[1,2] 高建河 黄莎 张玉安 罗勇 徐红春 ZHANG Lei;GAO Jianhe;HUANG Sha;ZHANG Yu’an;LUO Yong;XU Hongchun(Wuhan Research Institute of Posts and Telecommunications,Wuhan 430074,China;Accelink Technologies Co.,Ltd.,Wuhan 430205,China)

机构地区：[1]武汉邮电科学研究院,武汉430074 [2]武汉光迅科技股份有限公司,武汉430205

出　　处：《光通信研究》2024年第1期72-77,共6页Study on Optical Communications

基　　金：国家重点研发计划资助项目(2019YFB1803802)。

摘　　要：【目的】为了应对不断增长的超千兆需求,从千兆走向万兆,从第五代固定网络(F5G)走向高级第五代固定网络(F5.5G),50 Gbit/s无源光网络(PON)被认为是F5.5G的重要组成部分。故文章针对当前接入网络发展状况,对50 Gbit/s PON技术进行了深入研究。【方法】文章首先介绍了实现50 Gbit/s PON高灵敏度面临的困难,并提出了解决方案。方案中,50 Gbit/s的非归零(NRZ)信号通过雪崩光电二极管(Avalanche Photodiode,APD)探测器,在强电场的作用下形成可被检测到的宏观电流,该电流通过跨阻放大器(TIA)放大并转换成电压输出。对其进行均衡处理,采用光数字信号处理(oDSP)芯片的前馈均衡器(FFE)和判决反馈均衡器(DFE)对脉冲信号的拖尾现象进行补偿后,再通过DFE将码间干扰的影响降到最低。接着重点分析了APD、TIA和oDSP等关键技术,并采用25与50 Gbit/s APD对接收性能进行比较。【结果】两组实验测试结果显示,第1组实验25 Gbit/s APD在测试时间4 min内接收信号无误码,接收光功率为-8.48 dBm,当误码率(BER)为2.78e-2时,接收光功率达-26.61 dBm;在使用50 Gbit/s APD的情况下,4 min内接收信号无误码时,接收光功率为-8.97 dBm。当BER为2.78e-2时,接收光功率达到-27.05 dBm,第2组数据50 Gbit/s APD-2也达到了同样的实验效果。【结论】50 Gbit/s APD接收灵敏度更高,性能更好,更适合使用在50 Gbit/s PON光模块中实现高性能接收。最后文章针对未来降成本方案在均衡技术与APD上的应用提出了可行性分析。【Objective】In order to cope with the growing demand for ultra-gigabit,from gigabit to 10-gigabit,from The 5th Generation Fixed networks(F5G)to F5G-Advanced(F5.5G),50 Gbit/s Passive Optical Network(PON)is considered to be an important part of F5.5G.Therefore,according to the current access network development situation,50 Gbit/s PON technology is deeply studied in this paper.【Methods】This paper first introduces the difficulties in achieving high sensitivity of 50 Gbit/s PON,and proposes a solution.50 Gbit/s Non-Return-Zero(NRZ)signals pass through Avalanche Photodiode(APD)detectors to form macroscopic currents that can be detected under the action of strong electric fields.The current is amplified by a Transresistance Amplifier(TIA)and converted into a voltage output.After balancing,the Feed Forward Equalizer(FFE)and Decision Feedback Equalizer(DFE)of optical Digital Signal Processing(oDSP)chip are used to compensate the trailing phenomenon of pulse signal,and then the influence of intersymbol interference is minimized by DFE.Then the paper analyses the key technologies such as APD,TIA and oDSP,and the receiving performance is compared with that of 25 Gbit/s APD.【Results】According to the experimental test results of the two groups,the received optical power of the 25 Gbit/s APD in the first group is-8.48 dBm when the receiving signal has no error code during the test time of 4 min,and the received optical power reaches-26.61 dBm when the Bit Error Rate(BER)is 2.78e-2.In the case of 50 Gbit/s APD,the received optical power is-8.97 dBm when the received signal has no bit error in 4 min,and the received optical power reaches-27.05 dBm when the BER is 2.78e-2.The second set of 50 Gbit/s APD-2 data also achieves the same experimental results.【Conclusion】In conclusion,50 Gbit/s APD has higher receiving sensitivity,better performance,and is more suitable for use in 50 Gbit/s PON optical modules to achieve high receiver sensitivity.Finally,a feasible scheme is proposed on the balance technology and APD for

关 键 词：50 Gbit/s无源光网络 雪崩光电二极管 光数字信号处理 跨阻放大器 高性能接收 

分 类 号：TN915.6[电子电信—通信与信息系统]