摘要
提出了一种基于多波长分组的无源光网络系统监测方案,用于解决基于反射型的故障监测方案中用户之间易发生因干扰导致的链路状态误判的问题。该方案将不同波长分配到不同组,实现不同光网络单元(ONU)组之间的识别,从而避免不同组成员之间的干扰。在此基础上,将与光路终端距离相近的ONU分配到不同组内,以此降低组内ONU发生相互干扰的概率。此外,还研究了用户数量、传输脉冲功率和脉冲宽度对该系统性能的影响。通过理论推导与仿真可知,在检测波长通道数为4、检测光脉宽为10-8s、用户数量为16、最大距离差为2 km的无源光网络系统用户中,检测信号的信噪比为9.06 dB,识别精度为2 m。这些结果表明,基于多波长分组的无源光网络监测系统方案能够支持对大容量无源光网络系统的监控,并且在易发生干扰的用户数量较多的情况下具有较好的性能。
Objective In recent years,with the rapid development of internet businesses and the emergence of emerging industries,large-capacity and high-speed optical access network systems have been deployed and extensively studied.Passive optical network(PON)technology has become a cost-effective optical access network solution due to its natural advantages of low power consumption and flexible bandwidth access.However,because of the passive nature of PON systems,in the event of fiber faults,the fault points cannot actively report fault information to the central office,making real-time monitoring and fault location maintenance work difficult.Additionally,there is mutual interference between users in the centralized tree-shaped network architecture of PON systems,which makes the point-to-point fault monitoring scheme of traditional optical network systems unable to accurately locate the specific link and fault.Therefore,studying effective PON system monitoring plans has also become one of the focuses of future PON system research.PON system fault detection methods,such as improved schemes using wavelength-tunable OTDR,Brillouin OTDR,and optical feedback with chaotic lasers,require adding difficult-to-install and/or expensive equipment to the system,which increases the system cost to some extent.Alternatively,although existing optical encoding schemes have good scalability and low upgrade cost,they have not considered the problem of system performance degradation caused by interference between different users.In this article,a PON monitoring system based on multi-wavelength grouping is proposed.By assigning users prone to interference to different groups and deploying corresponding reflecting Bragg gratings at the end of the link,different wavelengths are used to detect and distinguish between user groups,thereby reducing the probability of interference.We hope that our scheme and model can provide useful assistance for the design of PON fault monitoring systems.Methods A user distribution model for PON is developed to calc
作者
金哲怡
毕美华
滕旭阳
胡淼
Jin Zheyi;Bi Meihua;Teng Xuyang;Hu Miao(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,Zhejiang,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2024年第1期420-429,共10页
Acta Optica Sinica
基金
江苏省新型光纤技术与通信网络工程研究中心开放研究课题(SDGC2120)
上海交通大学光纤通信网与新型光通信系统国家重点实验室开放基金(2023GZKF019,2023GZKF023)。
关键词
光通信
光编码
故障监测
用户分布
信噪比
信号干扰比
optical communication
optical encoding
fault detection
user distribution
signal-to-noise ratio
signal-to-interference ratio