最新刊期
卷 ， 期 3 ， 2023
- 摘要：Industrial IoT (IIoT) infrastructure for smart manufacturing refers to common facilities based on IoT that support smart manufacturing in industries or sectors. It is independent from the products and production process in specific factories. This article provides requirements and framework of IIoT infrastructure for smart manufacturing to help service providers implementing their system according to the needs of smart manufacturing, and merge existing and newly developed IIoT infrastructures, in order to give the stakeholders of smart manufacturing guidance for their applications.关键词：smart manufacturing;industrial Internet of Things;infrastructure;framework;characteristics
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发布时间：2023-05-25 - 摘要：The accurate evaluation of the communication quality of the interconnection link of the data center is an important basis to realize the coordination in the data network. In this paper, a hybrid amplification model for all-optical data center interconnection networks based on wavelength selective switches is established, which can quickly evaluate indicators such as optical signal-to-noise ratio and bit error rate in the interconnected links. In this paper, the data center interconnection link under the condition of no repeater amplification is discussed. The amplifier selection schemes under different interconnection distances are given. Through the simulation, the influence of different path selection on the communication quality of the interconnection link is compared under the conditions of the same interconnection distance and optical power gain. According to the corresponding theoretical model and algorithm, the optimal routing of the data center Internet can be established.关键词：data center interconnection;all-optical switching;hybrid amplification;distributed Raman amplification
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发布时间：2023-05-25 - 摘要：Recently, Radio over Fiber (RoF) technology has become a hot research topic in the broadband communication access network field and has attracted much attention in the industry. This is mainly because the technology makes full use of the massive bandwidth of optical fiber transmission and the application advantages of flexible coverage of wireless communication. In the evolution and development of RoF technology, multi-dimensional multi-order modulation has important scientific research significance and practical value because it can improve the system bandwidth utilization and reduce the signal transmission and receiving cost. This paper summarizes the research progress of traditional amplitude modulation, typical multi-dimensional multi-order modulation and some representative new multi-dimensional multi-order modulation technologies. We also briefly analyzes the application prospect of multi-dimensional multi-order modulation technology in RoF system.关键词：RoF;multi-dimensional multi-order;modulation;demodulation;transmission
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发布时间：2023-05-25 - 摘要：With the continuous development of Internet technology and the continuous expansion of network scale, new network services emerge in an endless stream. In order to ensure the quality of user service, accurate and rapid classification of application traffic is the focus of current research. The traditional service identification method is based on protocol or specific service classification, which is suffered from low applicability. Combining traffic characteristics and machine learning methods, this paper proposes a traffic identification method based on the fusion of Generative Adversative Network (GAN) and Extreme Gradient Lift Boosting (XGBoost). Firstly, the traffic characteristics representing service resource requirements. Then GAN algorithm was improved to expand a few class samples to solve the problem of low model accuracy caused by the unbalanced distribution of data sets in the process of application identification. Finally, the random forest algorithm was used to select the feature, and the XGBoost algorithm was used to complete the model training. The results show that the accuracy of this method is 97.32%.关键词：application identification;XGBoost;GAN;unbalanced data;feature reduction
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发布时间：2023-05-25 - 摘要：As one of the main applications of quantum cryptography, Quantum Key Distribution (QKD) is a promising secure key transmission method. Compared with traditional communication methods, QKD protocols based on the basic principles of quantum mechanics have unconditional security in theory. In general, the preparation and transmission of quantum states during QKD require the encoding, transmission, and measurement of photons. In recent years, QKD has made great progress in theory and engineering applications, and has also promoted the deployment of QKD networks all over the world. This paper focuses on several recent works on hybrid continuous-discrete variable QKD protocols. Combined with the coding method of discrete variable QKD and the detection method of continuous variable QKD, the advantages and disadvantages of building a QKD channel in practice are analyzed. Given the current stage of hybrid continuous-discrete variable QKD, we summarized its potential research priorities and difficulties in the future.关键词：QKD;optical communication system;security proof;post-processing
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发布时间：2023-05-25 - 摘要：In the era of 5th Generation Mobile Communication Technology (5G) communication, hardware products such as optical modems and routers are updated iteratively. As one of the key technologies of passive optical network, Dynamic Bandwidth Allocation (DBA) constantly optimizes its own performance. The functional complexity of the chip is increasing, and the verification of its logic function is particularly important. This paper presents an architecture of DBA module verification platform in passive optical networks. Based on the verification methodology framework of Universal Verification Methodology (UVM), the platform calls the System Verilog (SV) reference model. It can cover a large number of scenarios with a few test cases, and realize the verification and self checking of DBA traffic requirements and authorized function points. The coverage rate of Register Transfer Level (RTL) code can reach more than 95%. The simulation results shows that the verification platform can support the system level verification of DBA, and the framework reusing and automatic data comparison. The proposed architecture can meet the requirements of verification, and provide an efficient and comprehensive verification environment for the performance test of DBA, and greatly improve the verification efficiency.关键词：passive optical network;UVM;DBA;verification
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发布时间：2023-05-25 - 摘要：As an important part of the power Internet of things, the distribution field area network is the "last mile" infrastructure of the power Internet of things. It can solve the communication problem of the last mile of the power Internet of things. In order to meet the high real-time and high reliability requirements of distribution field area network control services and improve the coverage and reliability of the network, a highly reliable and fast routing optimization algorithm based on Dijkstra algorithm is proposed. The field high-speed power line carrier and radio frequency communication methods of the field area network have complementary advantages. The nodes select the most reliable communication link to transmit data through the hybrid routing table, and consider the reliability and real-time constraints at the same time. The simulation results show that the high-reliability routing optimization algorithm of the distribution field area network can effectively increase the coverage capacity, the number of successfully transmitted services and the average routing reliability.关键词：distribution field area network;field high-speed power line carrier;radio frequency;high reliable routing
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发布时间：2023-05-25 - 摘要：Aiming at the problem of low accuracy and sensitivity of outer strand breakage monitoring of optical cable, a high-precision monitoring method of outer strand breakage of optical cable based on optical fiber temperature sensing is designed. The high-speed data acquisition circuit, signal amplification and photoelectric conversion circuit of optical fiber temperature sensor are analyzed to obtain the optimal monitoring mode. The optical fiber temperature sensor is arranged on the optical cable to collect the outer strand breaking temperature data. Wavelet de-noising method is introduced to construct the signal model of optical cable outer temperature data, separate the effective signal and noise, and realize the high-precision monitoring of optical cable strand breakage. Taking 24B1-45 and 24B1-08 Optical Fiber Composite Overhead Ground Wire (OPGW) optical cables as examples, the experimental results show that the signal-to-noise ratio of optical fiber temperature sensor can reach 152 and 157 dB, and the response frequency can reach 6 230 and 6 310 times/s. After the application of this method, it can ensure that it is not subject to too much interference with high monitoring accuracy, and meet the requirements of high-precision monitoring. Therefore, it can effectively detect the broken strand of the outer layer of the optical cable through the temperature, which provide a reliable guarantee for the fault monitoring of the outer layer of the optical cable in remote areas.关键词：optical fiber temperature sensor;optical coupler;broken strands on the outer layer of optical cable;inter-integrated circuit bus;high-precision monitoring
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发布时间：2023-05-25 - 摘要：For the problem of inhomogeneity of the output optical power of multiple output ports, the paper designs a 1×4 Multimode Interference (MMI) coupler based on Silicon-On-Insulator (SOI) and proposes a new method to optimize its homogeneity. A tapered waveguide is used at the input/output of the coupler. To improve the uniformity of the MMI coupler, an unequal-width design is used for the tapered waveguide at the output. After optimization, the uniformity of the four output ports is as high as 0.007 4 dB, while the total insertion loss is only 0.058 dB. According to this method, the transmission constant of the output, avoid crosstalk between waveguides, and achieve an improvement in the uniformity of the output port of the MMI coupler.关键词：silicon photonics;multimode interferometric couplers;uniformity;loss
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发布时间：2023-05-25 - 摘要：The effective and efficient refractive index of a multilayer optical waveguide is computed by taking into account the various order modes of the waveguide, such as the Quasi-Transverse Electric/Transverse Magnetic (Quasi-TE/TM) mode. According to the effective refractive index method, the effective refractive index of the Quasi-TE/TM mode is calculated from the electromagnetic field curve distribution calculated for each mode in the 6-layer loss optical waveguide compute the effective refractive index each order of TE/TM mdes. Further, we analyze the dependence of the waveguide properties on the structure. We conclude that the mode effective refractive index and mode order do not decrease monotonicallythe lossy waveguide mode is more prevalent. The research work in this paper can be used as the theoretical basis for the design, fabrication and application of practical optical waveguide devices.关键词：effective refractive index method;dispersion equation;multilayer optical waveguides;Quasi-TE/TM mode
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发布时间：2023-05-25 - 摘要：The transmission line forms of the power divider mainly include microstrip line, stripline, waveguide structure, etc, among which the connection between stripline structure and other transmission lines is a challenge. In response to this challenge, this paper proposes a hybrid transmission line one-to-four power divider with a stripline opening and directly connected to microstrip line. Through the analysis of the basic principles of the power divider via electromagnetic simulation software, the power divider is modeled and simulated, and the design method is verified by physical verification. The power divider has an input and output reflection coefficient of less than-10 dB and the isolation of 15 dB in the frequency range of 2~6 GHz, which achieves a good design effect. The bending design of the power divider meets the design requirements of miniaturization. This paper provides certain reference value and significance in the future research.关键词：power divider;Wilkinson;stripline;microstrip line;one-to-four;miniaturization;ultra-wideband
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发布时间：2023-05-25 - 摘要：Aiming at the problem of spectrum scarcity faced by Vehicle to Everything (V2X) communication, a deep reinforcement learning method is proposed to manage V2X spectrum resources. Firstly, the V2X communication model of a single vehicle to infrastructure link is established. Combined with the constraints such as frequency spectrum subband and transmission power, the optimization problem is constructed to maximize the comprehensive efficiency of V2X communication network. Secondly, considering the non-convexity of the optimization problem, the communication model can be regarded as a Markov decision process. Then, the Dueling-Deep Q Network (Dueling-DQN) algorithm is introduced to obtain the optimal spectrum subband selection and transmission power allocation strategy to maximize the comprehensive efficiency of V2X communication network. Finally, the simulation is carried out on tensorflow software platform to verify the performance of the proposed method. The simulation results show that Dueling-DQN algorithm can obtain higher link performance and V2X communication network efficiency compared with other algorithm.关键词：V2X communication;deep reinforcement learning;spectrum allocation;transmission power distribution;V2X communication network;comprehensive efficiency
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发布时间：2023-05-25
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