最新刊期
卷 ， 期 2 ， 2016
- 摘要：The techniques of transmission performance optimization for high-speed coherent optical detection based 100Gbit/s PDM-QPSK systems is studied under the irregular fiber span configuration scenario.The analytical calculation model for the optimal link configurations is obtained under the irregular fiber span scenario.Numerical simulations are carried out for verification.Simulation results show that the optimal configuration scheme outperforms the conventional full span loss compensation scheme with 1.3dB Qfactor improvement.This optimal configuration method can be effectively applied for current link design and online performance optimizations in 100Gbit/s PDM-QPSK systems,to improve their transmission performance under the irregular span scenarios.关键词：100 Gbit/s systems;PDM-QPSK;Transmission performance optimization
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发布时间：2022-06-28 - 摘要：Existing proposals of Software-Defined Information-Centric Networking（SDICN）are difficult to support massive content delivery and to enable respective updates of switching and buffering components.This motivates us to propose an overlay-based SDICN system,in which content request forwarding and caching run only at the edge cache nodes.Decoupling caching from switching relaxes the above limitations of the existing proposals.Centralized control derived from software-defined networking overcomes the sub-optimality problem with overlay mechanisms.Experiments based on our prototype show that the system can be naturally superposed upon a software-defined network with significant reduction of response time when a few number of cache nodes are deployed.Our results are beneficial for the extension and application of software-defined networking and information-centric networking.关键词：information-centric networking;soft-defined networking;edge caching;centralized control
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发布时间：2022-06-28 - 摘要：In this paper,we use a High Non-Linear Fiber（HNLF）to achieve broadband wavelength conversion.We first introduce the basic principles and parameters of HNLF,and then derive the theory of wavelength conversion based on Four-Wave Mixing（FWM）.Finally,the factors which may have influences on the conversion efficiency are analyzed.The simulations are conducted in the software Optisystem.After optimization of several parameters,we demonstrate a broadband and high-efficiency converter based on HNLF.关键词：wavelength converter;FWM;HNLF
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发布时间：2022-06-28 - 摘要：The virtualization of the Router’s Main Control unit function based on the x86 platform can provide support for several technologies including virtualization,Software Defined Network（SDN）and cloud computing for further applications.Traditional router code is developed on private network processor.In order to achieve traditional function of a router in a virtualized environment,we recompile the virtual network interface card’s board support package,drive and protocol stacks based on traditional router code.This method realizes the router’s code mirror running normally in Vmware virtual machines based on normal Windows platform.The feasibility is also verified by the sending and receiving packet test.Compared with the traditional method of programmable router virtualization,this method utilizes a pure software virtualization technology and it is based on VxWorks router protocol stack,which shows much better versatility and flexibility.关键词：router;virtualization;NFV;SDN
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发布时间：2022-06-28 - 摘要：The main task of power communication sector during the 13 rd Five Year Plan is how to reasonably design the layout with UHV construction of electric power communication optical cable line resource and improve the overall power of the backbone communication network architecture.In this paper,the demand for power communication business is calculated at first.The forecast of demand of business is chosen as the important input parameter for the network topology planning optimization.Then,the adaptability of the business requirements of Hunan province’s electric power network architecture is analyzed by the network simulation.Finally,the paper gives the suggestions of capacity configuration,key sites and links in the backbone ring network.This research method can provide guidance on the planning of the electric power communication network during the13 rd Five Year Plan period.关键词：electric power communication network;13rd Five Year Plan;business requirements;network simulation
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发布时间：2022-06-28 - 摘要：To solve the defects of P-cycle generating algorithm named Grow,a NewGrow algorithm is proposed in this paper.It first calculates all optional cycles’ AE,and then expands the selecting candidate P-cycles.The simulation is conducted in the network topology.The simulation results show that the new method can improve the quality of P-cycles,and reduce the number of P-cycles,as well as the burden of network nodes and improve the network resource utilization.关键词：P-cycle;generating algorithm;prior efficiency
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发布时间：2022-06-28 - 摘要：Survivability is one of the most important promising technologies in Wavelength Division Multiplexing（WDM）networks.The P-cycle based dynamic multicast protection scheme（IpC）is widely accepted as a good solution due to its fast restoration time and high capacity efficiency.This paper presents an improved IpC mechanism named EIpC including both the segment IpC and the path IpC algorithm simultaneously.The main feature of EIpC is to use segment IpC algorithm to find a new P-cycle for a segment and path IpC algorithm to find a new P-cycle for a path,respectively.Theoretical analysis and simulation results show that the path IpC has better performance in resource utilization,the number of P-cycle（s）and the P-cycle’s average coverage,than the segment IpC and the classical（link）IpC.However,the link IpC has a higher average AE than the segment IpC and the path IpC.关键词：WDM;survivability;Multicast;P-cycle
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发布时间：2022-06-28 - 摘要：Digital synchronization network is an essential part of modern communication network.This paper starts with the necessity of the construction of the digital synchronization network,and then summarizes several main transport technologies.Based on the current development trend of Transport technology,we propose the principles and strategies of the synchronization network.Finally we provide several suggestions of network organization according to the network of an operator.关键词：synchronization network;Synchronization technology;SDH;WDM
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发布时间：2022-06-28 - 摘要：A new diagnosis method based on wavelet packet and neural network is proposed for the fault diagnosis of submarine cables.By this method,the fiber Brillouin frequency shifts in the cables are converted into temperature and strain data.The monitoring signals are first denoised by using the six-layer wavelet decomposition and the faulty data are decomposed and reconstructed by three-layer wavelet packet,and then such structural eigenvectors as energy,standard deviation and Shannon entropy are extracted and inputted to the Back Propagation（BP）neural network for training and testing.The experimental analysis shows that inputting the standard deviation as the eigenvector to the BP neural network is the optimum method for the fault diagnosis in submarine cables.关键词：optical fiber composite submarine cable;fault diagnosis;wavelet packet;BP neural network
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发布时间：2022-06-28 -
An Algorithm for Correcting Optic/electric Composite Submarine Cable Ampacity Calculation Parameters
摘要：This paper describes a method to calculate the ampacity through thermal modeling using finite element modeling software.In the thermal modeling,the uncertainty of material parameters may cause error.In order to reduce the error,we propose an algorithm to amend the ampacity calculation parameters according to the principle of secant method algorithm.By comparing with the real data measured by the distributed optical fiber sensing temperature measurement equipment,the error of corrected data is less than that of uncorrected data,which confirms the validity of the algorithm.关键词：submarine cable;oilplatform;ampacity;thermal modeling- 4
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发布时间：2022-06-28 - 摘要：PAM4format provides an effective solution for 100/400Gbit/s Ethernet.In this paper,the standard development of400Gbit/s Ethernet and two form factors of 400Gbit/s optical modules are introduced.The basic principle and structure diagram of PAM4 optical transceiver module are described and the technical scheme and parameters of different rate are analyzed.It shows that 28 GBaud PAM4is a good solution to achieve 400 GEthernet.Then the technical level of device,chip,test instrument and test solution is summarized,which provides a guidance for the design and implementation of PAM4 optical transceiver module.关键词：100/400 GEthernet;PAM4;optical transceiver module
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发布时间：2022-06-28 - 摘要：The electrical fringing field effect between neighboring pixels of the LCOS chip will result in a parasitic grating and the crosstalk among the ports of the WSS（Wavelength Selective Switch）module.A simplified 2foptical model was established and the relationship between the electrical fringing field effect and the performances of the WSS module was analyzed based on Fourier optics.The result shows that,with the increase of the diffraction angle of the LCOS grating,the crosstalk among the outputs of the WSS module increase.Reducing the space between the outputs or increasing the focal length of the lens can reduce the crosstalk,resulting in the more the number of outputs in the WSS module.The results presented in this paper are important for the parameter design and optimization of WSS module.关键词：all optical network;wavelength selective switch;liquid crystal on silicon;phase grating
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发布时间：2022-06-28 - 摘要：In the demodulation process of Fiber Bragg Grating（FBG）sensing system,the accuracy of the system is affected by the noise seriously.In order to improve the measurement accuracy of the system,denoising is an indispensable part in the demodulation.In this paper,we construct a new threshold function with much better denoising performance based on typical wavelet threshold denoising algorithm with soft and hard threshold function,and threshold functions in the existing literature.Through the de-noising experiment for the noisy FBG reflected signal,the result shows that the proposed threshold function can increase the average signal-to-noise ratio by 35dB,and reduce the root mean square error by 0.10.3,when comparing with the typical soft and hard threshold function.Finally,we apply the proposed method to the FBG temperature sensing system to demonstrate the feasibility of the method.The experiment results show that the demodulation accuracy is less than5 pm,which meet the accuracy requirement of the FBG sensing system.关键词：FBG signal;wavelet denoising;threshold function;FBG sensing system
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发布时间：2022-06-28 - 摘要：A wideband CMOS Power Amplifier（PA）operating from 700 MHz to 3GHz with 23.6dBm maximum output power is presented in this paper.The PA consists of a single-stage amplifier with fully differential cascode topology.On-chip transformers paralleled with switched-capacitors are applied in the input and output of this PA.The wideband input and output matches are realized by digitally controlling the states of switches to change the value of capacitors,while tuning the operating frequency of this PA to realize wide range operation.This wideband PA including on-chip transformers is designed based on TSMC 0.18μm CMOS model and simulated using Agilent’s ADS.Layout’s post-simulation results indicate that the input match S11 is perfectly matched（less than-10dB）from 700 MHz to 3GHz and the gain of S21 reaches 27dB at 1.7GHz with only 0.75mm2 chip area.关键词：CMOS;power amplifier;switched-capacitors;wideband match
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发布时间：2022-06-28 - 摘要：The coupling efficiency of Active fiber Optical Cable（AOC）has an important effect on the performance of data transmission in the cloud computing environment.This paper carries out the study on the case when the coupling efficiency of the transmission medium AOC is lower than 75%.We first optimize the production process for current AOC by the COB technology.After the optimization process,the multimode sticky installation accuracy is within ± 5μm,and the optical loss can be controlled within 1dB,and the coupling efficiency can be ensured more than 90%.Then,we analyze and calculate the position of the VCSEL by the processes,obtaining the maximum distance from the fiber array to the VCSEL is 117.68μm for the first time.The results show that the COB technology and the 45 degree reflective surface optical fiber coupling process can achieve the requirements of low cost and high efficiency with improved coupling efficiency of AOC.The result in this paper can provide a way for the further study on big data and cloud computing.关键词：cloud computing;AOC;COB;coupling efficiency
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发布时间：2022-06-28 - 摘要：The current sensor based on Giant Magnetostrictive Material（GMM）and Fiber Bragg Grating（FBG）has the advantages of optical current sensor.In this paper,a sensor probe is formed by combining FBG and GMM using home-made epoxy glue.The static operation point of sensor is changed by adding a bias magnetic field.Ferrite material with good high-frequency performance is used as magnetism-guided loop to confine and send the magnetic field into the sensor probe.The magnetic field is generated by the alternating current.Then the change of current is turned into the wavelength shift of FBG.Thus the current measurement can be realized through the FBG demodulation system.Static and dynamic responses of the sensor are tested experimentally.The experimental result shows that the proposed method can effectively measure the current.关键词：current sensor;giant magnetostrictive material;fiber Bragg grating
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发布时间：2022-06-28 - 摘要：The high-power high-bandwidth photodetector is required at the base station in the Radio over Fiber（ROF）system.This paper presents a power combining circuit research on PI type photoelectric detector array.The probe is embedded in an inductor connected with artificial transmission lines.In order to obtain high power and large bandwidth signal,each group of unit structure of PI type circuit of photoelectric detector are connected with inductors based on the structure of array structure together to constitute the required structure.In order to achieve the best match,the first and final stage synthetic circuit branches are cascaded with two photodiode to reduce the equivalent capacity of synthetic circuit.Simulation results show that this arrangement can effectively combine multiple RF photocurrents while keeping the large bandwidth.Comparing with traveling wave detector array at the same level,the combining performance of PI type photoelectric detector array is better.关键词：PI type structure;detector array;power combining;photoelectric conversion;traveling wave
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发布时间：2022-06-28 - 摘要：Digital coherent technology with advanced modulation formats such as PDM-QPSK has enabled us to increase the transmission capacity of optical communication networks.In this paper,a mathematical model is built for the IQ modulator.The effects of bias voltage and phase conditions are then analyzed.Finally,a fast and efficient method for testing the DC bias characteristic of IQ modulator is proposed.This method is demonstrated to be simple and accurate for IQ modulator as well as twin IQ modulator in the practical engineering application.关键词：IQ modulator;MZI;bias voltage
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发布时间：2022-06-28 - 摘要：This paper studies DFT based channel estimation algorithm for practical LTE-A system.In order to solve the energy leakage problem of Channel Impulse Response（CIR）based on DFT channel estimation algorithm,a novel DFT based channel estimation method is proposed.The proposed method reconstructs the CIR by recurrence sequence in order to suppress the noise and reserve the CIR energy.The proposed method also replaces the jitter points of Channel Frequency Response（CFR）with the result of Least Square（LS）algorithm in the corresponding position to further suppress Gibbs phenomenon.Simulation results show the performance of proposed method is better than those of LS and classic DFT based algorithms.关键词：LTE-A;channel estimation;DFT;the energy leakage
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发布时间：2022-06-28 - 摘要：To solve the problems of high transmission delay and low forwarding efficiency in the Routing Algorithm based on Daily Routines（RADR）in opportunistic social networks,an Efficient Community-based Routing Algorithm is proposed（ECRA）.The algorithm only selects the neighbor nodes which are in the same community with message destination node to calculate the node’s important degree.The algorithm uses topological connections to intercept the encounter node.If there exists node which has higher node’s importance than the encounter nodes neighbor,the message is transmitted to the encounter node neighbor nodes by the encounter node.Theoretical analysis and simulation results show that ECRA outperforms existing RADR and the correlation algorithms in terms of delivery ratio,average end-end delivery delay,relay ratio and average storage time.关键词：opportunistic social networks;routing algorithms;communities;important degree;interceptionmechanism
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发布时间：2022-06-28 - 摘要：In this paper,we first introduce the principle of LED based visible light communication system and wavelength division multiplexing technology.Then we design the system structure of real-time visible light communication link with wavelength division multiplexing technology based on Optisystem software.Under the direct modulation scheme,the transmission performances of NRZ and RZ modulation are studied,respectively.The effects of different data rates on the bit error rate and Qfactor of the system are analyzed.The performances of bit error rate at different transmission distance are also discussed.Finally,the feasibility and stability of the wavelength division multiplexing technology in the visible light communication system are verified.关键词：visible light communication;wavelength division multiplexing;LED;BER
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发布时间：2022-06-28 - 摘要：In the traditional Selected Mapping（SLM）scheme,side information is required to be transmitted in the reduction of Peak-Average-Power Ratio（PAPR）of Space-Frequency Block Coding（SFBC）Multi-Input Multi-Output Orthogonal Frequency Division Multiplexing（MIMO-OFDM）system.In order to solve this problem,a modified semi-blind SLM algorithm without side information is proposed in this paper.In order to reduce the complexity and embed the side information,the symbol sequence of the two antennas are divided into odd part and even part.One part is multiplied by the phase factor to help receiver to detect the side information.The analysis and simulation results show that the proposed algorithm greatly reduces the complexity of the receiver and has good Bit Error Rate（BER）performance.关键词：SFBC;SLM;PAPR;side information
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发布时间：2022-06-28 - 摘要：In the mixed network which consists of cellular and device-to-device,there is a dynamic resources allocation problem in multi-cell D2 Dcommunication system when the interference between the users of intra-cell and inter-cell is considered.In this paper,we design a utilityfunction with interference control of the transmitted power of D2 Dusers after introducing the non-cooperative game theory and pricingmechanism.This utilityfunction not only considers the fairness but also the interference of the system.Then we demonstrate the existence and uniqueness of Nash equilibrium in a power control model,which indicate that the D2 Dusers can achieve a stable state after the games.Simulation results show that the proposed algorithm not only improves the fairness among the users,but also increases the throughputs and improves the performances of the system.关键词：resource allocation;device-to-device;non-cooperative game theory;interference
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发布时间：2022-06-28
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