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Information and Communications Technology and Policy

Information and Communications Technology and Policy
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Current Issue

    • The development and evolution of all-optical network
    • CUI Xiuguo, JIA Wei, MA Junqi, WANG Chaokai, HUANG Kangyong, LI Xiang
    • Information and Communications Technology and Policy. 2021, 47(12): 8. DOI:10.12267/j.issn.2096-5931.2021.12.002
    • Abstract ( 806 )   
    • Based on the development trend of network service and the development status of all-optical network, this paper analyzes the architecture and key feature of all-optical network, and proposes the future development direction of all-optical network, including automation, intelligence, high reliability and metro extension. At the same time, the basic key technologies supporting the evolution of all-optical network are studied, including optical-layer scheduling, optical-layer digitalization, and electrical-layer scheduling. Optical-electrical collaborative operation can fully meet the network requirements of low latency, large bandwidth and high reliability. With the rapid and significant reduction of WSS cost, ROADM will gradually evolve from the backbone network to the metro edge network, supporting the wide deployment of all-optical network.
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    • Architecture and key techniques of all-optical infrastructure in cloud era
    • WANG Guangquan, SHEN Shikui
    • Information and Communications Technology and Policy. 2021, 47(12): 19. DOI:10.12267/j.issn.2096-5931.2021.12.003
    • Abstract ( 416 )   
    • With the continuous improvement of business bandwidth, network performance, network security and network management and control requirements in 5G and cloud era, optical network will further directly provide connection oriented network services. At the same time, it will also become a solid base for operator networks and a comprehensive service carrier to meet the needs of different bandwidth, performance, security and service levels in cloud era. The development of optical network is facing great opportunities and challenges. The architecture of alloptical infrastructure in the cloud era is described. Based on this architecture, the key technologies of optical network such as ultra-high speed transmission, all-optical integrated access, SDN management and control, opening and decoupling, intelligent enhancement and optical network digital twinning are analyzed.
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    • Discussion on technology development trends of backbone all-optical network
    • LYU Kai, TANG Jianjun, ZHANG Anxu, LI Junjie
    • Information and Communications Technology and Policy. 2021, 47(12): 41. DOI:10.12267/j.issn.2096-5931.2021.12.006
    • Abstract ( 474 )   
    • Facing the new infrastructure construction, China Telecom put forward the transformation strategy of “Integration of cloud and network ”, and took the lead in proposing and practicing the concept of “ all-optical network”. Among them, the backbone all-optical network is the first step, the goal is to form an inter-province and intra-province integrated backbone all-optical network covering the whole country, and consolidate the bandwidth cornerstone of the new information infrastructure. Based on the demand analysis, this paper makes an in-depth analysis on the current technology and future development trend of China Telecom backbone all-optical network, including high speed large capacity optical transmission, extended band, new type of optical fiber, all-optical switching technology, etc. Hope to provide reference for related technology research and industrial development work, and jointly promote the development of all-optical network technology.
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    • Research progress of large-capacity optical transmission technologies and investigation on 400G C+L band system
    • FENG Zhenhua , SHANG Wendong , LU Yuan , WANG Zhaohui , SHI Hu , CHEN Yong
    • Information and Communications Technology and Policy. 2021, 47(12): 48. DOI:10.12267/j.issn.2096-5931.2021.12.007
    • Abstract ( 580 )   
    • Firstly, three ways to improve the capacity of long-haul optical transmission system are analyzed, and then the research progress and standardization trends of the 3 technical hot-spots are introduced including long-haul 400G, multi-band transmission with wave-band extension and space division multiplexing (SDM). After that the application prospects of SDM and multi-band transmission technologies. Finally, a 400Gbit / s per wavelength real-time transmission experiment over C + L band is carried out to verify the improvement of channel power flatness and transmission penalty brought by optical channel power equalization technique. The research shows that compared with SDM, C + L band expansion is more practical for commercial deployment in the short term. For C + L band 400G transmission system, power equalization can improve the OSNR bottleneck of the system and reduce the nonlinear penalty of L band. 
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    • Spectrum broaden solutions for broadband amplifiers in optical transmission networks
    • XIAO Li, FU Chengpeng, ZHANG Weiqing, BU Qinlian
    • Information and Communications Technology and Policy. 2021, 47(12): 62. DOI:10.12267/j.issn.2096-5931.2021.12.008
    • Abstract ( 360 )   
    • Extending more usable optical bandwidth is an effective solution for dealing with the transmission capacity demand multiplication. It is with acceptable performance and easy for management by extending conventional CBand to super CBand. Adding Lband amplifier in parallel with CBand amplifier will bring some performance penalty, while almost double the bandwidth. The technical solution for further extending to super Lband is still under investigation, to study how to achieve high pump conversion efficiency as well as gain flatness.
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    • Application and problems of digital twin technology in optical network
    • ZHU Kangqi , , HUA Nan , , LI Yanhe , ZHENG Xiaoping
    • Information and Communications Technology and Policy. 2021, 47(12): 69. DOI:10.12267/j.issn.2096-5931.2021.12.009
    • Abstract ( 395 )   
    • Nowadays, the optical network is developing towards complex network environment and intelligent management and control system. There is no doubt that the intelligent management and control of the optical network is based on the accurate perception of the network. The digital twin technology uses a large number of perception units in the network system, combined with the network prior model, to carry out real-time and accurate “ mapping” of the network operating status and performance, thereby in the digital world an accurate “ copy” of the real network is obtained, enabling accurate analysis, automatic control and performance optimization of the real network. Data collection is an important part of the digital twin system in optical networks. Once a problem occurs during the collection stage, the performance of the system will be severely affected. This paper will conduct preliminary analysis and modeling of these problems, and discuss about the existing and potential solutions. 
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    • Analysis and suggestions of the digital talents shortage issues in China 
    • ZHANG Lin, WANG Lixiang, HU Yanni
    • Information and Communications Technology and Policy. 2021, 47(12): 76. DOI:10.12267/j.issn.2096-5931.2021.12.010
    • Abstract ( 679 )   
    • The digital economy has flourished in recent years. The digital industrialization has accelerated the intergenerational overlap; the digital transformation of industries has speeded up; the contradiction between supply and demand of talents has become increasingly prominent; and the digital talent gap has become an important bottleneck restricting the development of China􀆳s digital economy. Through an in-depth analysis of the current three types of shortages faced by China􀆳s digital talents: quantitative shortage, quality shortage and structural shortage, this article discusses the main reasons in three dimensions, including supply, demand and supporting environment. Finally, policy suggestions to deal with the shortages of digital talents are proposed in the light of the actual need to promote the healthy development of digital economy.
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    • Research on terminal security issues in massive machine type communication scenarios
    • CHEN Lin, CUI Tao
    • Information and Communications Technology and Policy. 2021, 47(12): 93. DOI:10.12267/j.issn.2096-5931.2021.12.013
    • Abstract ( 247 )   
    • Massive Machine Type Communication ( mMTC ), as one of the three application scenarios of 5G communication, will become an important part of supporting the Internet of Things and ubiquitous networks. It is of great significance to study the security of 5G mMTC scenarios. This article mainly studies the security problems faced by terminal devices in the 5G mMTC scenario. Firstly, we introduce several main business scenarios and terminal device types of 5G mMTC. Secondly, we analyze the security risks and challenges faced by terminal devices in the 5G mMTC business scenario. Finally, we discuss the key technologies of terminal equipment safety in the 5G mMTC scenario. 
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