最新刊期
卷 ， 期 6 ， 2018
- 摘要：This paper proposes a new paradigm of future network:Net-AI Agent and City-AI Agent.It is totally different from the"various future network research projects launched by developed countries.The innovation is no longer confined to the scope of"pure network".Instead,it jumps out of the scope of"pure network innovation",starting with the huge increase of network connections from 10 billion to 100 billion and trillion by starting with the huge demand level of the future Internet from the consumption field to the industry field,by starting with the big data demand level,where the total amount of human knowledge has doubled from several hundred years to a half day,by starting from compatibility with traditional network technology and protecting existing network investment.This paper proposes"Network（Cloud Network）+ Sensor Networks+ Big Data+Algorithmic Processing+ AI"of the end-to-end and whole network of human-like behavior consciousness and self-regulating ability,（because it is very difficult to solve these comprehensive problems by pure network innovation alone）,which can coordinate mutually and solve the problems in network together.Network reconstruction and Software Defined Network/Network Function Virtualization（SDN/NFV）are the first step of this paradigm.The paper introduces several key issues in detail including the network reconstruction,necessity and urgency of network reconstruction and intelligence,be-all of network reconstruction," what is Net-AI agent",and" what is City-AI agent".关键词：Net-AI agent;City-AI agent;a new paradigm of future network;technological compatibility;investment protection;network reconstruction;SDN/NFV
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发布时间： - 摘要：The singular optical beams refer to the Orbital Angular Momentum（OAM）beam with phase singularity and the Cylindrical Vector Beam（CVB）with polarization singularity.Both the OAM and CVB are orthogonal optical modes,which can serve as basis for spatial division multiplexing optical communication.By providing a new degree of freedom,the singular optical beam multiplexing techniques dramatically increase the optical communication capacity and show significant application potentials in both classical and quantum optical communication.In this review paper,we firstly introduce the mathematical descriptions and physics properties of the OAM and CVB beams.Then the methods and techniques for OAM and CVB generation/detection are summarized.We also review the latest progresses of the OAM and CVB multiplexing based optical communication applications including the free-space and optical fiber communication.Finally,we talk about the pros and cons of the singular optical beams,and show our prospective for the future developments of the techniques.关键词：singular optical beams;optical communication technology;OAM;CVB
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发布时间： - 摘要：Optical fiber sensing has the advantages of immunity to electromagnetic interference,resistance to corrosion,light weight,small size,high resolution,and easy multiplexing,which has been widely used for various sensing applications,such as aerospace,petrochemical,electronic power,civil engineering,and biomedicine.The conventional interrogation schemes suffer from the problems of low resolution,low rate,and poor stability.To solve these problems,microwave photonics based sensing and interrogation technique has attracted extensive attention of the researchers.In this paper,a comprehensive and systematic overview of optical fiber sensing interrogation techniques based on microwave photonics is presented.Several microwave photonics based interrogation schemes and the corresponding operation principles are introduced,and the future development direction are also discussed.关键词：microwave photonics technology;optical fiber sensing;sensing interrogation technique
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发布时间： - 摘要：In recent years,Mode Division Multiplexing（MDM）techniques have been widely considered as an effective approach to break out the capacity bottleneck of conventional single-mode optical-fiber communication systems and networks.The typical schemes include strongly-coupled and weakly-coupled ones.In a weakly-coupled MDM scheme,the modal crosstalk should be suppressed as much as possible.Therefore,a signal in each mode can be transmitted and received independently.In this paper,we first introduce the technical principles of strongly-coupled and weakly-coupled schemes.Then a weakly-coupled Few-Mode Fiber（FMF）with double-ring core structure,together with the mode Multiplexer（MUX）and Demultiplexer（DEMUX）based on mode-selective coupler,are designed and fabricated.Next,transmission experimental demonstration based on 6-mode10-km weakly-coupled MDM is achieved with intensity modulation and Digital-Signal-Processing-free（DSP-free）direct detection.A degenerate mode demultiplexing scheme is designed,which is then fabricated based on the heating and tapering method.Finally,the first real-time video MDM transmission is realized,which indicates that a big step has been made for the MDM technique towards practical implementation.关键词：spatial division multiplexing;MDM;FMF;weakly coupling;degenerate modes;mode MUX/DEMUX
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Self-Optimizing Optical Network Implementation Mechanism based on Edge Computing and Cloud Computing
摘要：With the rapid expansion of optical networks,the network operation and management are facing increasingly severe challenges in terms of reliability,flexibility,and security.In order to reduce the complexity of decision making and improve the intelligent control ability of optical networks,this paper proposes the concept of Self Optimizing Optical Networks（SOON）.In addition,this paper proposes a SOON implementation mechanism based on edge computing and cloud computing.The cooperative mechanism among optical transport nodes and control nodes is able to satisfy the computing requirement for artificial intelligence application.关键词：optical network;artificial intelligence;cloud computing;edge computing;collaborative control;SOON- 6
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发布时间： - 摘要：Visible light screen communication has the characteristics of strong anti-interference ability,no occupation of frequency spectrum resources,simple link deployment,and easy interaction.This paper designs a visible light screen communication system based on Convolutional Neural Network（CNN）.It includes the definition of the frame structure,the introduction of the receiving unit CNN module,and the design of the resolution mechanism.The definition of the frame structure ensures the reliability of the system and enriches the diversity of the transmission content of the screen communication.The introduction of the CNN module allows the receiving unit to automatically identify the content sent by the screen.It also does not rely on traditional positioning detection patterns,which improves the intelligence and information carrying capacity.The design of the two resolution mechanisms improves the universality of screen communication.It can achieve 96.4% recognition success rate at realtime 150 kbit/s and non-real-time 300 kbit/s communication rate,which can be used to transmit text,picture,audio type files.关键词：visible light communication;screen communication system;CNN;resolution mechanism
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发布时间： - 摘要：Software Defined Transport Network（SDTN）controls the network resources and status of the transport network logically and centrally by separating control function and transmission function,which can realize the programmability and automatic control of transport network.It can also build a flexible,open,and intelligent transport network architecture for business applications.In the software-defined transport network architecture,the northbound interface is an important link between the SDTN controller and the upper application.However,there is no unified standard,which has brought difficulties to the development of the SDTN.This paper first discusses the popular northbound interface information model Transport Application Programming Interface（TAPI）.Then we design and implement the TAPI northbound interface in combination with the SDTN coordinate controller to test and verify the effectiveness and interoperability of the TAPI northbound interface information model.Finally,we provide a reference for the selection of the SDTN northbound interface information model.关键词：SDTN;software defined network;the northbound interface;TAPI
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发布时间： - 摘要：The link of backbone optical communication network is easily destroyed,resulting in communication failure.Therefore,it is important to identify the link importance of backbone optical communication networks and determine the protection level of links according to the link importance.In topology of backbone optical communication network,this paper first calculates the natural connectivity of the network,and defines the weighted natural connectivity by taking the zero eigenvalues of the Laplace matrix as the weight of the natural connectivity.By analyzing the impact of link failure on network invulnerability with the weighted natural connectivity,the link topology importance is quantitatively calculated,which can realize the identification of the link importance in the backbone optical communication networks.Finally,the algorithm in this paper is expounded.Taking a model of specific power communication optical backbone network as an example,the effectiveness and accuracy of the proposed algorithm are verified by comparison with other algorithms.In addition,it is demonstrated that the weighted natural connectivity is more comprehensive and reasonable in evaluating link importance than natural connectivity.关键词：backbone optical communication network;natural connectivity;invulnerability;link importance
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发布时间： - 摘要：The military optical cable network is an important communication infrastructure for army.The traditional artificial walking patrol and inspection is the main method to find the hidden dangers of the optical cable lines.However,it takes a long time,and consumes a lot of manpower and material resources.It is also vulnerable to the changes in laying methods and terrain environment.However,the use of unmanned aerial vehicle for the patrol and inspection of optical cable lines,is the main development direction in the future due to the characteristics of fast,safe and economical.Because the factor of excavation in construction is the most important reason for the obstacle of the optical cable lines,it is proposed to apply the deep learning Faster Region-based Convolutional Neural Network（Faster R-CNN）target detection method to detect the image of engineering vehicle obtained by unmanned aerial vehicle.Based on the Vehicle Detection in Aerial Imagery（VEDAI）public data set,the engineering vehicle data set is made.Through simulation,the target detection of engineering vehicles such as excavators and bulldozers in aerial photography is achieved.The Average Precision（AP）value can reach 0.659.The detection results are better than traditional Deformable Part Model（DPM）and Histogram of Oriented Gradient+ Local Binary Pattern+ Support Vector Machine（HOG+LBP+SVM）machine learning detection methods.The study can provide a certain reference for the application of patrol and inspection for military optical cable lines by unmanned aerial vehicle.关键词：patrol and inspection for optical cable lines by unmanned aerial vehicle;deep learning;Faster R-CNN;engineering vehicle detection
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发布时间： - 摘要：Amplified Spontaneous Emission（ASE）produced by pulsed fiber laser system is an important factor restricting the peak power.Pulsed pump is an effective method to suppress the ASE among the pulses of pulsed fiber lasers.The pulse pumping characteristics of Yb doped double clad fiber amplifier are experimentally studied in this paper.An experimental model consisting of a signal source,an isolator,an amplifier stage and a filter is designed.For the pulsed pump,the pump power and pump duration are two most important factors,which are required to be determined during amplifier design.In this paper,the relationship between pulse energy and ASE with pump power and duration is studied.The conclusions are valuable for the design of pulsed pump fiber amplifier.关键词：fiber laser;pulsed pump;ASE power
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发布时间： - 摘要：In order to effectively improve the spectrum efficiency of the Multiple-Input Multiple-Output（MIMO）system and reduce the complexity of the algorithm,this paper proposes a matrix decomposition algorithm based on iterative method.First,the analog precoding matrix is initialized and the optimal precoding matrix is obtained.Then the digital precoding matrix is obtained by simulating the precoding matrix and the optimal precoding matrix,and the analog precoding matrix is updated by extracting the phase information in the digital precoding matrix.The updated simulation matrix updates the digital matrix and finally iterates through alternating iterations until convergence.The simulation results show that it has lower complexity and better performance,which is closer to the pure digital precoding performance.关键词：millimeter-wave MIMO;hybrid precoding;matrix decomposition;RF link
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发布时间： - 摘要：In the indoor wireless communication system,the light-fidelity-wireless fidelity（LiFi-WiFi）hybrid network is an emerging communication mode,which can provide users with high data rate and effectively release the spectrum space.Aiming at throughput optimization of hybrid LiFi-WiFi network,the system load balancing scheme can be formulated as a joint utility maximization problem,and a logarithmic utility function is used to achieve proportional fairness for users.In this scheme,based on the signalling overhead caused by handover between light-fidelity（LiFi）and wireless fidelity（WiFi）,as well as the channel noise from the direct and reflective paths,the data rate and total throughput effected by SNR are analyzed and evaluated with co-channel interference and non-channel interference.The simulation results show that the estimation of the proposed scheme can meet the actual communication demand.关键词：LiFi;WiFi;capacity analysis;horizontal switching;vertical switching;throughput of a hybrid network
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