In future optical transport networks,lightpath performance analysis is of great practical significance for fully automated management.In general,the quality of transmission(QoT)of lightpaths,measured by optical qualit...In future optical transport networks,lightpath performance analysis is of great practical significance for fully automated management.In general,the quality of transmission(QoT)of lightpaths,measured by optical quality factor or optical signal-to-noise ratio,has a complex time-varying process,along with the interactions of the other lightpath state parameters(LSPs),such as transmit power,chromatic dispersion,polarization mode dispersion.Current studies are mostly focused on lightpath QoT estimation,but ignoring lightpath-level data analytics.In this case,our article proposes a novel lightpath performance analysis method considering recurrence plot(RP)and cross recurrence plot(CRP).Firstly,we give a detailed interpretation on the recurrence patterns of LSPs via a qualitative 2-D RP representation and its quantitative measure.It can potentially enable the accurate and fast lightpath failure detection with a low computational burden.On the other hand,CRP is devoted to modeling the relationships between lightpath QoT and LSPs,and the correlation degree is determined by a geometric mean of multiple indexes of cross recurrence quantification analysis.From the view of application,such CRP analysis can provide the effective knowledge sharing to guarantee more credible QoT prediction.Extensive experiments on a real-world optical network dataset have clearly demonstrated the effectiveness of our proposal.展开更多
The fifth generation(5G) of mobile communications are facing big challenges, due to the proliferation of diversified terminals and unprecedented services such as internet of things(IoT), high-definition videos, virtua...The fifth generation(5G) of mobile communications are facing big challenges, due to the proliferation of diversified terminals and unprecedented services such as internet of things(IoT), high-definition videos, virtual/augmented reality(VR/AR). To accommodate massive connections and astonish mobile traffic, an efficient 5G transport network is required. Optical transport network has been demonstrated to play an important role for carrying 5G radio signals. This paper focuses on the future challenges, recent studies and potential solutions for the 5G flexible optical transport networks with the performances on large-capacity, low-latency and high-efficiency. In addition, we discuss the technology development trends of the 5G transport networks in terms of the optical device, optical transport system, optical switching, and optical networking. Finally, we conclude the paper with the improvement of network intelligence enabled by these technologies to deterministic content delivery over 5G optical transport networks.展开更多
Due to the increasing variety of information and services carried by optical networks, the survivability of network becomes an important problem in current research. The fault location of OTN is of great significance ...Due to the increasing variety of information and services carried by optical networks, the survivability of network becomes an important problem in current research. The fault location of OTN is of great significance for studying the survivability of optical networks. Firstly, a three-channel network model is established and analyzing common alarm data, the fault monitoring points and common fault points are carried out. The artificial neural network is introduced into the fault location field of OTN and it is used to judge whether the possible fault point exists or not. But one of the obvious limitations of general neural networks is that they receive a fixedsize vector as input and produce a fixed-size vector as the output. Not only that, these models is even fixed for mapping operations (for example, the number of layers in the model). The difference between the recurrent neural network and general neural networks is that it can operate on the sequence. In spite of the fact that the gradient disappears and the gradient explodes still exist in the neural network, the method of gradient shearing or weight regularization is adopted to solve this problem, and choose the LSTM (long-short term memory networks) to locate the fault. The output uses the concept of membership degree of fuzzy theory to express the possible fault point with the probability from 0 to 1. Priority is given to the treatment of fault points with high probability. The concept of F-Measure is also introduced, and the positioning effect is measured by using location time, MSE and F-Measure. The experiment shows that both LSTM and BP neural network can locate the fault of optical transport network well, but the overall effect of LSTM is better. The localization time of LSTM is shorter than that of BP neural network, and the F1-score of LSTM can reach 0.961566888396156 after 45 iterations, which meets the accuracy and real-time requirements of fault location. Therefore, it has good application prospect and practical value to introduce neural network into the fault location field of optical transport network.展开更多
A layered network model for optical transport networks is proposed in this paper,which involves Internet Protocol(IP) ,Synchronous Digital Hierarchy(SDH) and Wavelength Division Mul-tiplexing(WDM) layers. The strategy...A layered network model for optical transport networks is proposed in this paper,which involves Internet Protocol(IP) ,Synchronous Digital Hierarchy(SDH) and Wavelength Division Mul-tiplexing(WDM) layers. The strategy of Dynamic Joint Routing and Resource Allocation(DJRRA) and its algorithm description are also presented for the proposed layered network model. DJRRA op-timizes the bandwidth usage of interface links between different layers and the logic links inside all layers. The simulation results show that DJRRA can reduce the blocking probability and increase network throughput effectively,which is in contrast to the classical separate sequential routing and resource allocation solutions.展开更多
As new generation mobile networks, 3G networks focus on data services and integrate voice, data and multimedia services. However, traditional Optical Transport Networks (OTNs) cannot meet the requirements of 3G networ...As new generation mobile networks, 3G networks focus on data services and integrate voice, data and multimedia services. However, traditional Optical Transport Networks (OTNs) cannot meet the requirements of 3G networks anymore, because of their complicated configuration, low bandwidth efficiency, high cost, and bad network and service scalability. The emerging of Multi-Service Transport Platform (MSTP), Wavelength Division Multiplexing (WDM), and Automatically Switched Optical Network (ASON) technologies for optical fiber communications makes up for these weaknesses. The leading solution to 3G access transport networks is the MSTP technology based on Synchronous Digital Hierarchy (SDH), while that to 3G core transport network is ASON+WDM.展开更多
随着电力系统的快速发展,电力通信网络对高带宽、大容量、低时延以及高可靠性的需求日益增加,而传统技术已难以满足这些要求。光传输网络(Optical Transport Network,OTN)技术凭借高带宽、灵活调度及多业务承载能力,在电力通信传输中发...随着电力系统的快速发展,电力通信网络对高带宽、大容量、低时延以及高可靠性的需求日益增加,而传统技术已难以满足这些要求。光传输网络(Optical Transport Network,OTN)技术凭借高带宽、灵活调度及多业务承载能力,在电力通信传输中发挥着关键作用。本研究通过分析OTN技术的组网规划、技术测试及OTN组网运用,评估其在扩大传输容量、网络可用性及保护倒换时间等方面的效果。结果表明,OTN技术在提升电力通信网络运行效率、可靠性和安全性方面发挥了重要作用。展开更多
为提升网络的传输效率和传输质量,研究基于软件定义光传送网(Software Optical Transport Network,SoTN)技术和第五代移动通信技术(5th Generation Mobile Communication Technology,5G)的传输组网技术。首先分析了5G传输网端到端架构...为提升网络的传输效率和传输质量,研究基于软件定义光传送网(Software Optical Transport Network,SoTN)技术和第五代移动通信技术(5th Generation Mobile Communication Technology,5G)的传输组网技术。首先分析了5G传输网端到端架构存在的优势及不足,其次采用SOTN技术和5G网络切片技术设计了一种传输组网方案,最后进行实验分析。测试结果表明,该传输组网技术具有较好的应用效果,数据包的传输成功率均在90.00%以上,并且端到端的最大时延为16.11ms,能够保证网络的传输效果。展开更多
In this paper, we propose an optical burst network architecture supporting the ge- netic mesh topology. The intermediate node architecture of the mesh network can be the same with current wavelength switching Wave- le...In this paper, we propose an optical burst network architecture supporting the ge- netic mesh topology. The intermediate node architecture of the mesh network can be the same with current wavelength switching Wave- length Division Multiplexing （WDM） net- works, and thus can reuse existing deployed infrastructure. We employ a novel Optical Time Slot Interchange （OTSI） at the source nodes for the first time to mitigate the burst conten- tion and to increase the bandwidth utilization. Time- and wavelength-domain reuse in the OTSI significantly saves optical components and red- uces blocking probability.展开更多
随着光传送网(Optical Transport Network,OTN)技术的快速发展,如何实现不同技术下的调度模型的统一,已成为一个重要的研究课题。本文通过对OTN网络各类光交换技术的研究,提出了一种基于不同技术下统一建模的方法,旨在适配不同技术的OT...随着光传送网(Optical Transport Network,OTN)技术的快速发展,如何实现不同技术下的调度模型的统一,已成为一个重要的研究课题。本文通过对OTN网络各类光交换技术的研究,提出了一种基于不同技术下统一建模的方法,旨在适配不同技术的OTN网络,形成统一的底层OTN模型,加强OTN调度算法的扩展性,扩大OTN网络调度适用范围,提高资源利用率,并降低维护和运营成本。展开更多
随着企业数字化、智能化的业务需求扩大,数据交互和传输量越来越大,运营商组建了基于光传送网(Optical Transport Network,OTN)的光传输网络。为优化现有OTN网络,充分利用OTN的技术优势,通过采用合理优化运维和安全措施,解决了数据传输...随着企业数字化、智能化的业务需求扩大,数据交互和传输量越来越大,运营商组建了基于光传送网(Optical Transport Network,OTN)的光传输网络。为优化现有OTN网络,充分利用OTN的技术优势,通过采用合理优化运维和安全措施,解决了数据传输过程中的业务接入和调度瓶颈、设备老化和光信号衰减、智能化管理等问题,大大提高了网络传输能力和传输质量,实现了大数据传输的高效、便捷、可靠和智能化。展开更多
近年来,随着能源互联网的快速发展,国家电网有限公司各业务系统对通信系统传输带宽的要求越来越高,单波10 G大容量骨干光传送网络(optical transport network,OTN)已无法满足数据类业务和大颗粒业务的带宽需求。目前单波100 G OTN系统...近年来,随着能源互联网的快速发展,国家电网有限公司各业务系统对通信系统传输带宽的要求越来越高,单波10 G大容量骨干光传送网络(optical transport network,OTN)已无法满足数据类业务和大颗粒业务的带宽需求。目前单波100 G OTN系统技术日趋成熟,但大跨距的100 G OTN应用研究与分析较少,文章介绍了新疆A站—B站385 km大跨距100 G OTN传输设计中遇到的超长站距难以开通满足业务的OTN波数问题,并通过实验测试和数据分析,得出了相关结论和解决方案,对后续国家电网有限公司大容量骨干光传输系统大档距的应用具有重要的参考价值。展开更多
为优化光纤传输质量,满足宽带接入的可控化管理需求,要严格遵循光纤传输应用控制的技术规范,有效建立基于光传送网(Optical Transport Network,OTN)技术的光纤传输接入网络,从而维系信息传输的及时性,搭建完整的技术运行框架。应从大颗...为优化光纤传输质量,满足宽带接入的可控化管理需求,要严格遵循光纤传输应用控制的技术规范,有效建立基于光传送网(Optical Transport Network,OTN)技术的光纤传输接入网络,从而维系信息传输的及时性,搭建完整的技术运行框架。应从大颗粒信息传输处理、城域核心网和干线网络、宽带用户接入、长途网应用交叉设备等方面对OTN技术的具体应用内容进行系统化分析,更好地实现网络性能的平滑升级,从而满足城域网建设的具体需求。因此,系统研究光纤传输接入网络中OTN技术的应用要点具有现实意义。展开更多
文章深入研究了光纤传输接入网络中光传送网(Optical Transport Network,OTN)技术的应用。详细介绍了OTN技术,包括其特点和组成等内容,并分析了OTN技术在光纤传输接入网络中的应用。本研究为理解和应用OTN技术性提供了坚实的理论和实践...文章深入研究了光纤传输接入网络中光传送网(Optical Transport Network,OTN)技术的应用。详细介绍了OTN技术,包括其特点和组成等内容,并分析了OTN技术在光纤传输接入网络中的应用。本研究为理解和应用OTN技术性提供了坚实的理论和实践基础。展开更多
在信息技术飞速发展和通信网络日新月异的今天,传输设备在现代通信系统中有着举足轻重的地位。分组传送网(Packet Transport Network,PTN)和光传输网络(Optical Transport Network,OTN)是目前两大主流的传输技术,可满足人们对高速、大...在信息技术飞速发展和通信网络日新月异的今天,传输设备在现代通信系统中有着举足轻重的地位。分组传送网(Packet Transport Network,PTN)和光传输网络(Optical Transport Network,OTN)是目前两大主流的传输技术,可满足人们对高速、大容量、低延迟的业务需求。因此,文章综合分析PTN和OTN传输设备,探讨其优劣势及未来发展趋势,旨在给相关领域决策者与研究人员提供参考,推动通信网络不断创新与发展。展开更多
在现代社会,电力通信传输网络的重要性日益凸显,不仅关系到电力系统的正常运行,还直接影响着我国经济的可持续发展。为提升电力通信传输网络的质量,文章将通过理论与实践相结合的方法,深入探讨运用光传送网(Optical Transport Network,O...在现代社会,电力通信传输网络的重要性日益凸显,不仅关系到电力系统的正常运行,还直接影响着我国经济的可持续发展。为提升电力通信传输网络的质量,文章将通过理论与实践相结合的方法,深入探讨运用光传送网(Optical Transport Network,OTN)技术优化电力通信传输网络的方案。首先,简单介绍OTN技术的原理;其次,分析基于OTN技术的电力通信传输网络优化策略;最后,探讨基于OTN技术的电力通信传输网络优化案例。展开更多
基金supported in part by the Science and Technology Project of Hebei Education Department,Grant ZD2021088in part by the S&T Major Project of the Science and Technology Ministry of China,Grant 2017YFE0135700。
文摘In future optical transport networks,lightpath performance analysis is of great practical significance for fully automated management.In general,the quality of transmission(QoT)of lightpaths,measured by optical quality factor or optical signal-to-noise ratio,has a complex time-varying process,along with the interactions of the other lightpath state parameters(LSPs),such as transmit power,chromatic dispersion,polarization mode dispersion.Current studies are mostly focused on lightpath QoT estimation,but ignoring lightpath-level data analytics.In this case,our article proposes a novel lightpath performance analysis method considering recurrence plot(RP)and cross recurrence plot(CRP).Firstly,we give a detailed interpretation on the recurrence patterns of LSPs via a qualitative 2-D RP representation and its quantitative measure.It can potentially enable the accurate and fast lightpath failure detection with a low computational burden.On the other hand,CRP is devoted to modeling the relationships between lightpath QoT and LSPs,and the correlation degree is determined by a geometric mean of multiple indexes of cross recurrence quantification analysis.From the view of application,such CRP analysis can provide the effective knowledge sharing to guarantee more credible QoT prediction.Extensive experiments on a real-world optical network dataset have clearly demonstrated the effectiveness of our proposal.
基金supported by the National Nature Science Foundation of China Projects(No.61871051,61771073)the Nature Science Foundation of Beijing project(No.4192039)
文摘The fifth generation(5G) of mobile communications are facing big challenges, due to the proliferation of diversified terminals and unprecedented services such as internet of things(IoT), high-definition videos, virtual/augmented reality(VR/AR). To accommodate massive connections and astonish mobile traffic, an efficient 5G transport network is required. Optical transport network has been demonstrated to play an important role for carrying 5G radio signals. This paper focuses on the future challenges, recent studies and potential solutions for the 5G flexible optical transport networks with the performances on large-capacity, low-latency and high-efficiency. In addition, we discuss the technology development trends of the 5G transport networks in terms of the optical device, optical transport system, optical switching, and optical networking. Finally, we conclude the paper with the improvement of network intelligence enabled by these technologies to deterministic content delivery over 5G optical transport networks.
文摘Due to the increasing variety of information and services carried by optical networks, the survivability of network becomes an important problem in current research. The fault location of OTN is of great significance for studying the survivability of optical networks. Firstly, a three-channel network model is established and analyzing common alarm data, the fault monitoring points and common fault points are carried out. The artificial neural network is introduced into the fault location field of OTN and it is used to judge whether the possible fault point exists or not. But one of the obvious limitations of general neural networks is that they receive a fixedsize vector as input and produce a fixed-size vector as the output. Not only that, these models is even fixed for mapping operations (for example, the number of layers in the model). The difference between the recurrent neural network and general neural networks is that it can operate on the sequence. In spite of the fact that the gradient disappears and the gradient explodes still exist in the neural network, the method of gradient shearing or weight regularization is adopted to solve this problem, and choose the LSTM (long-short term memory networks) to locate the fault. The output uses the concept of membership degree of fuzzy theory to express the possible fault point with the probability from 0 to 1. Priority is given to the treatment of fault points with high probability. The concept of F-Measure is also introduced, and the positioning effect is measured by using location time, MSE and F-Measure. The experiment shows that both LSTM and BP neural network can locate the fault of optical transport network well, but the overall effect of LSTM is better. The localization time of LSTM is shorter than that of BP neural network, and the F1-score of LSTM can reach 0.961566888396156 after 45 iterations, which meets the accuracy and real-time requirements of fault location. Therefore, it has good application prospect and practical value to introduce neural network into the fault location field of optical transport network.
基金the Science & Technology Foundation of Huawei Ltd. (No.YJCB2005040SW)the Creative Foundation of Xidian University (No.05030).
文摘A layered network model for optical transport networks is proposed in this paper,which involves Internet Protocol(IP) ,Synchronous Digital Hierarchy(SDH) and Wavelength Division Mul-tiplexing(WDM) layers. The strategy of Dynamic Joint Routing and Resource Allocation(DJRRA) and its algorithm description are also presented for the proposed layered network model. DJRRA op-timizes the bandwidth usage of interface links between different layers and the logic links inside all layers. The simulation results show that DJRRA can reduce the blocking probability and increase network throughput effectively,which is in contrast to the classical separate sequential routing and resource allocation solutions.
文摘As new generation mobile networks, 3G networks focus on data services and integrate voice, data and multimedia services. However, traditional Optical Transport Networks (OTNs) cannot meet the requirements of 3G networks anymore, because of their complicated configuration, low bandwidth efficiency, high cost, and bad network and service scalability. The emerging of Multi-Service Transport Platform (MSTP), Wavelength Division Multiplexing (WDM), and Automatically Switched Optical Network (ASON) technologies for optical fiber communications makes up for these weaknesses. The leading solution to 3G access transport networks is the MSTP technology based on Synchronous Digital Hierarchy (SDH), while that to 3G core transport network is ASON+WDM.
文摘随着电力系统的快速发展,电力通信网络对高带宽、大容量、低时延以及高可靠性的需求日益增加,而传统技术已难以满足这些要求。光传输网络(Optical Transport Network,OTN)技术凭借高带宽、灵活调度及多业务承载能力,在电力通信传输中发挥着关键作用。本研究通过分析OTN技术的组网规划、技术测试及OTN组网运用,评估其在扩大传输容量、网络可用性及保护倒换时间等方面的效果。结果表明,OTN技术在提升电力通信网络运行效率、可靠性和安全性方面发挥了重要作用。
文摘为提升网络的传输效率和传输质量,研究基于软件定义光传送网(Software Optical Transport Network,SoTN)技术和第五代移动通信技术(5th Generation Mobile Communication Technology,5G)的传输组网技术。首先分析了5G传输网端到端架构存在的优势及不足,其次采用SOTN技术和5G网络切片技术设计了一种传输组网方案,最后进行实验分析。测试结果表明,该传输组网技术具有较好的应用效果,数据包的传输成功率均在90.00%以上,并且端到端的最大时延为16.11ms,能够保证网络的传输效果。
文摘In this paper, we propose an optical burst network architecture supporting the ge- netic mesh topology. The intermediate node architecture of the mesh network can be the same with current wavelength switching Wave- length Division Multiplexing （WDM） net- works, and thus can reuse existing deployed infrastructure. We employ a novel Optical Time Slot Interchange （OTSI） at the source nodes for the first time to mitigate the burst conten- tion and to increase the bandwidth utilization. Time- and wavelength-domain reuse in the OTSI significantly saves optical components and red- uces blocking probability.
文摘随着光传送网(Optical Transport Network,OTN)技术的快速发展,如何实现不同技术下的调度模型的统一,已成为一个重要的研究课题。本文通过对OTN网络各类光交换技术的研究,提出了一种基于不同技术下统一建模的方法,旨在适配不同技术的OTN网络,形成统一的底层OTN模型,加强OTN调度算法的扩展性,扩大OTN网络调度适用范围,提高资源利用率,并降低维护和运营成本。
文摘随着企业数字化、智能化的业务需求扩大,数据交互和传输量越来越大,运营商组建了基于光传送网(Optical Transport Network,OTN)的光传输网络。为优化现有OTN网络,充分利用OTN的技术优势,通过采用合理优化运维和安全措施,解决了数据传输过程中的业务接入和调度瓶颈、设备老化和光信号衰减、智能化管理等问题,大大提高了网络传输能力和传输质量,实现了大数据传输的高效、便捷、可靠和智能化。
文摘近年来,随着能源互联网的快速发展,国家电网有限公司各业务系统对通信系统传输带宽的要求越来越高,单波10 G大容量骨干光传送网络(optical transport network,OTN)已无法满足数据类业务和大颗粒业务的带宽需求。目前单波100 G OTN系统技术日趋成熟,但大跨距的100 G OTN应用研究与分析较少,文章介绍了新疆A站—B站385 km大跨距100 G OTN传输设计中遇到的超长站距难以开通满足业务的OTN波数问题,并通过实验测试和数据分析,得出了相关结论和解决方案,对后续国家电网有限公司大容量骨干光传输系统大档距的应用具有重要的参考价值。
文摘为优化光纤传输质量,满足宽带接入的可控化管理需求,要严格遵循光纤传输应用控制的技术规范,有效建立基于光传送网(Optical Transport Network,OTN)技术的光纤传输接入网络,从而维系信息传输的及时性,搭建完整的技术运行框架。应从大颗粒信息传输处理、城域核心网和干线网络、宽带用户接入、长途网应用交叉设备等方面对OTN技术的具体应用内容进行系统化分析,更好地实现网络性能的平滑升级,从而满足城域网建设的具体需求。因此,系统研究光纤传输接入网络中OTN技术的应用要点具有现实意义。
文摘在信息技术飞速发展和通信网络日新月异的今天,传输设备在现代通信系统中有着举足轻重的地位。分组传送网(Packet Transport Network,PTN)和光传输网络(Optical Transport Network,OTN)是目前两大主流的传输技术,可满足人们对高速、大容量、低延迟的业务需求。因此,文章综合分析PTN和OTN传输设备,探讨其优劣势及未来发展趋势,旨在给相关领域决策者与研究人员提供参考,推动通信网络不断创新与发展。
文摘在现代社会,电力通信传输网络的重要性日益凸显,不仅关系到电力系统的正常运行,还直接影响着我国经济的可持续发展。为提升电力通信传输网络的质量,文章将通过理论与实践相结合的方法,深入探讨运用光传送网(Optical Transport Network,OTN)技术优化电力通信传输网络的方案。首先,简单介绍OTN技术的原理;其次,分析基于OTN技术的电力通信传输网络优化策略;最后,探讨基于OTN技术的电力通信传输网络优化案例。
