摘要
波分复用(WDM)光网络具有波长和节点数目众多、传输路径动态重构、业务/资源动态调度等特点,亟须发展低成本、高可靠的在线监测技术,以保障光网络的安全稳定运行。本文提出了一种基于四进制脉冲幅度调制(PAM4)数字光标签的低成本、高可靠、高效率监测方案,并创新设计了PAM4光标签加载、探测和处理等整套机制与方法,配合所提出的基于PAM4光标签序列特征的光功率监测误差修正方法以及基于频谱峰值的功率计算方法,所提方案可以准确高效地监测波长通道光功率、估计光信噪比(OSNR)并恢复数字标签信息等。搭建了16 GBaud偏振复用QPSK/16QAM WDM光传输仿真系统和离线实验平台,验证结果表明所提方案在25跨段长距离传输后的通道光功率监测误差不超过0.65 dB,OSNR估计误差不超过0.6 dB,性能略优于传统的基于差分相移键控(DPSK)低阶调制格式的光标签监测方案。
Objective Wavelength division multiplexing(WDM)optical networks include numerous wavelengths and nodes,dynamic reconfiguration of transmission paths,and dynamic scheduling of services/resources.Thus,a low-cost and highly reliable online monitoring technology is urgently required to ensure the safe and stable operation of WDM networks.It is the cornerstone technology to ensure the safe and efficient operation of the optical network and effectively reduce operation and maintenance costs.Currently,optical network monitoring obtains the spectral information of each channel using devices such as tunable optical filters.From this information,the channel performance such as the optical modulation format and optical signal-to-noise ratio(OSNR)can be obtained.Another scheme uses a high-speed service signal coherence receiver with complex digital signal processing(DSP)to monitor the channel performance;however,this method can only realize the end-to-end optical performance parameter monitoring of a single wavelength channel.The timeliness of monitoring cannot be guaranteed.Exciting schemes generally have problems such as high cost,poor monitoring reliability,inability to monitor the wavelength channel status at intermediate nodes in real time,and complex system structures.They cannot meet the requirements of low-cost and high-reliability optical performance monitoring for the new generation of large-scale complex optical networks.To address these problems,a low-cost and high-efficiency optical performance monitoring scheme based on a quadratic pulse amplitude modulation(PAM4)optical label is proposed for WDM optical networks.Methods This paper proposed an optical performance monitoring scheme based on the PAM4 optical label that uses a PAM4 modulation format digital label to carry more monitoring information and improve the timeliness of optical network monitoring.Using the DSP unit at the service transmitter,time-domain digital labels with specific frequency pilot tones were loaded flexibly into the corresponding waveleng
作者
杨桃
王雪
李开宣
张冰洁
石屿
陈舒阳
陈昕培
Yang Tao;Wang Xue;Li Kaixuan;Zhang Bingjie;Shi Yu;Chen Shuyang;Chen Xinpei(State Key Laboratory of Information Photonics and Optical Communication,Beijing University of Posts and Telecommunications,Beijing 100876,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第2期118-129,共12页
Chinese Journal of Lasers
基金
国家自然科学基金(62001045)
中央高校基本科研业务费专项资金项目(2022RC09)
信息光子学与光通信国家重点实验室(北京邮电大学)自主研究课题(IPOC2021ZT17)。
关键词
光通信
波分复用
光标签
光功率
光信噪比
监测
optical communications
wavelength division multiplexing
optical label
optical power
optical signal-to-noise ratio
monitoring
