最新刊期
卷 ， 期 1 ， 2016
- 摘要：There exist complex dependencies between electric power Optical Transport Network（OTN）service risk factors and link or node failure probability and type of service path configuration.In order to determine the influence degree of different factors on the service risks,it is necessary to adopt effective methods to analyze the correlation of service risks and their influence factors.This paper first gives the service risk model and the analytical approaches and analyzes the service risks in the failure scenario of the links or nodes.Then,it defines six service risk influence indicesand analyzes the correlation between the influence indices and the service risks using the Spearman’s rank correlation coefficient method.Finally,it verifies the feasibility of risk analysis and correlation analysis algorithmin practical cases.The research conclusions have certain reference value to OTN service risk assessment and service path optimized configuration.关键词：service risk analysis;electric power communication network;OTN;risk influence factor;correlation analysis
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发布时间： - 摘要：The all-optical wavelength conversion technology plays an important role in WDM networks and there have been mature theoretical study on the Semiconductor Optical Amplifier（SOA）-based all-optical wavelength conversion technology.However,it still has a lot of deficiencies in its performance.This paper analyzes and compares the principles and performances of SOA-based all-optical wavelength conversion technologies in different structures and types from the most basic ones to the improved technical schemes and looks into their application prospect and development orientations.The results show that we can improve the performance parameters of all-optical wavelength conversion technology in different aspects by changing the gain characteristic of SOA or system structures.关键词：SOA;all-optical wavelength conversion;XGM;XPM;FWM
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发布时间： - 摘要：In this paper,we make an exploratory study on the applications of the time synchronization technology named DOCSIS Timing Interface（DTI）adopted in the radio and television networks to communication networks,analyze the key issues required to be solved for its applications in communication networks in connection with the technical characteristics of DTI and conclude that it is feasible for the DTI technology to be transplanted to the communication networks after parameter conversions and become Universal Timing Interface（UTI）technology.Finally,we analyze and look into the prospect of the applications of the UTI technology in the communication networks.关键词：time synchronization;frequency synchronization;DTI;UTI;communication network
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发布时间： - 摘要：With the rapid development of cloud computing platform,the traditional network architecture can not meet our demands.The centralized control of data planes realized by the Software Defined Network（SDN）-based technology has become the evolution trend of the current network technologies.This paper first briefly introduces the design of the OpenFlow switch on the basis of such technologies as OpenFlow and OpenStack and the building of an OpenStack-based IaaS cloud management platform which further converges the advantages of SDN and cloud computing.Then,it presents a method of SDN simulation on the cloud computing platform,which can simulate the actual SDN and use the simulated network toevaluate the network performance,thus optimizing the design and reducing the input for SDN planning and construction.关键词：Openflow protocol;OpenStack software;SDN
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发布时间： - 摘要：The distributed optical fiber monitoring technology has been gradually applied in various fields,but at the present,the performance variations of sensing cables when subject to cyclic stress have not yet been investigated in depth.In line with the repeated cyclic stress that the cables undergo indoor tests and in various monitoring projects,simulated load,temperature and the environmental condition changes,three tests are designed and the cyclic fatigue performances of the distributed sensing cables are calibrated,obtaining the stress attenuation curves of the cables in different conditions.The experimental results indicate that the higher the initial stress of the cables,the higher cyclic frequency and the greater the attenuation amount and rate of the cable stress.关键词：distributed sensing;sensing cable;cyclic fatigue;calibration;stress
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发布时间： - 摘要：A novel THz wave Photonic Crystal Fiber（THz-PCF）is designed with a low-loss material polyethylene as the substrate.Its single mode cutoff frequency,dispersion and loss are numerically simulated using the full-vector finite element method.The results show that the frequency range of the THz single-mode propagation can be regulated by changing the cladding air hole period,air hole diameter and fiber core air hole diameter.When the cladding air hole period is 400μm,the claddingair hole diameter is 100μm and fiber core air hole diameter is 40μm,the broadband single-mode propagation range can not only be increased to 0.15THz,but also the waveguide dispersion can be controlled at±0.5ps/（nm·km）within the frequency range of 0.55THz.Moreover,the modal confinement loss will gradually decrease with the increase of the frequency and the minimum propagation loss will be 3.86dB/m at 2.8THz.关键词：THz wave;PCF;single-mode propagation;dispersion;loss
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发布时间： - 摘要：Loss and nonlinearity are the most critical factors affecting the performances of 100Gbit/s optical communication systems.This letter designs and develops a novel single-mode fiber for 400Gbit/s high-rate transmissions.With ultra-low-loss and super-large effective area characteristics,its attenuation coefficients are reduced to 0.165 dB/km at 1 550 nm and0.179dB/km at 1 625 nm respectively.The mode-field-diameter is 13.96μm at 1 550 nm,and the effective area is 153μm2.Moreover,this fiber has outstanding anti-bending performance and its key technological specifications are superior to the current international technological level and can provide the key fundamental material support to the next generation high-rate fiber-optic communications.关键词：400Gbit/s system;high-rate communication;ultra-low-loss optical fiber;large effective area fiber;large capacity
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发布时间： - 摘要：A novel structured low-loss broadband Photonic Crystal Fiber（PCF）is proposed,in the inner cladding of which six large air holes and six elliptical air holes are arranged.The fiber properties,such as mode field distribution,working bandwidth,confinement loss and dispersion,are analyzed by using the full-vector Finite Element Method（FEM）.The numerical computation results show that this fiber demonstrates the features of low-loss Single-Mode and Single-Polarization（SMSP）at1.401.73μm waveband only when the y-polarization mode exists,the confinement loss is less than 0.1dB/km and the dispersion flatness is 3.3ps/（km·nm）.The research results have certain instructive significance to the design of novel high performance SMSP-PCF.关键词：PCF;SMSP;confinement loss;FEM
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发布时间： - 摘要：An asymmetric triangular lattice-based Single Polarization Single Mode Terahertz Photonic Crystal Fiber（SPSMTPCF）is designed by using the full-vector Finite Element Method（FEM）,which is characteristic of high birefringence,wide bandwidth and low-flat dispersion.The analytical results show that its birefringence is as high as 0.036 5at the wavelength of330μm,the beat length is 9.04 mm and the confinement losses of the x-and y-polarization modes are 48.01dB/m and0.008 13dB/m respectively.In addition,the effective mode field area of the y-polarization is 7 557μm2,the numerical aperture is 0.56,the SPSM transmission is realized in the wavelength range of 326.5359μm,in which the confinement loss of the y-polarization mode is always below 0.1dB/m and this fiber is dispersion-flattened,with the dispersion value as low as（-2.14±0.45）ps/（nm·km）.关键词：TPCF;birefringence;SPSM;dispersion
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发布时间： - 摘要：In the light of the rigorous coupled wave theory and the equivalent medium theory,we propose a design and simulation method for an InN-based sub-wavelength grating guided-mode resonance filter structure in the visible spectral region and investigate the sensitivity of the filter reflection spectrum to thegrating parameters.When the filter high-peak reflectivity,low sideband and narrow linewidth remain unchanged,we change the grating period（ΔT =099.7nm）by a Micro-Electro-Mechanical-System（MEMS）comb actuator using its sensibility to the grating period in connection with the simulation,thus linearly controlling the resonant wavelength output in a tunable range of 23 nm and realizing aperiod-tunable reflective guided-mode resonance filter with the Full Width at Half Maximum（FWHM）smaller than 1.15 nm.关键词：sub-wavelength grating;guide-mode resonance;InN;MEMS
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发布时间： - 摘要：In order to reduce the insertion losses of electro-optic switches and simplify their structures,a new idea of fabricating optical switches based on Fiber Bragg Grating（FBG）with anisotropic cladding is presented,and its principle is analyzed by using the coupled-mode theory.At the same time,a method of manufacturing this kind of optical switches is provided by using Mg-doped LiTaO3 crystal as the grating cladding.Simulation results show that when electric field changes by 106 V/m,the extinction ratio rise to about 42.32 dB and compared with the existing FBG optical switches,these switches have higher extinction ratio and are even simpler in structure.关键词：anisotropic cladding;FBG;electro-optical effect;optical switch
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发布时间： - 摘要：This paper presents a photonic crystal ring cavity-based Optical Add/Drop Multiplexers（OADM）.In a square lattice photonic crystal structure,this device implements optical add/drop multiplexing by the coupling of line defects with ring cavity and the upload/download of the light waves at the specific frequency using the frequency selection function of the ring cavity.The simulation results show that when the incident port has incident light waves at multiple wavelengths,this OADM can upload/download light waves at a wavelength of 1 554.9 nm,the upload/download rate is 98.23%,the insertion loss is0.077 55 dB and the channel isolation is 33.37 dB and 32.98 dB respectively.With excellent performances,this device has reference significance to the development of integrated devices for optical communication.关键词：tetragonal lattice;photonic crystal;resonance frequency;filter;annular cavity
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发布时间： - 摘要：In response to the demand for the development of intelligent optical networks,a multi-dimensional Reconfigurable Optical Add/Drop Multiplexer（ROADM）node is proposed on the basis of the independently developed 1×9tunable bandwidth wavelength selective switch in this paper,and the related tests are conductedon its various performancesby using signals at two fixed bandwidth wavelengths,i.e.10Gbit/s and 1Tbit/s.The test results show that this ROADM node is colorless,directionless,contentionless,and gridless.关键词：tunable bandwidth wavelength selective switch;ROADM;colorless,directionless,contentionless,and gridless
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发布时间： - 摘要：In view of the special requirements of laser communication systems for optical mixers,this paper designs and completes a 90°mixer,with the signal light by spatial light input and the Local Oscillating（LO）light by polarization maintaining fiber input.The beam waist diameter of the spatial light introduced from the signal end of the device is 10 mm,the insertion loss of the signal light is less than 3.1dB and that of the LO less than 2.5dB.At the specified operating wavelength,the phase difference between branch I and branch Q satisfies 90°±5°.The experimental results show that this device meets the requirements of laser communication for mixer performances.关键词：90°mixer;spatial light;insertion loss;phase difference
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发布时间： - 摘要：We propose a novel mode-selection method in all-fiber laser cavity based on composite optical microsphere cavity Whispering-Gallery-Mode（WGM）resonance spectra and simulate and analyze the optical field distribution of the microsphere cavities constructed with multilayer media and parallel structures by using the Finite Difference Time Domain（FDTD）algorithm.On the basis of the optimal conditions for coupling the microsphere cavities with tapered fibers,we calculate and obtain their transmission spectra.By optimizing the parameters of microsphere cavities and improve the coupling conditions,we compress the WGM resonance spectra bandwidth and enhance the side-mode suppression ratio.The acquired narrow-band transmission spectra are of major significance to all-fiber laser mode selection.关键词：WGM;microsphere cavity;multilayer medium;double microsphere;transmission spectrum
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发布时间： - 摘要：With the rapid development of data communications and the Internet,the network P2 P,online applications and video services are all showing explosive growth and the advent of cloud computing era requires a large-capacity,high-density data interconnect and exchange processing,all these services have become the core driving force for the development of the N ×100Gbit/s technology.400 GE can further enhance network capacity and reduce transmission cost per bit on the basis of100 GE,effectively easing off the continuously growing pressure of traffic flow and network bandwidth that the operators daily face and will find large-scale applications in data centers.This article makes a detailed introduction and analysis of the technical scheme for 400 GE client side optical modules,transmission performances,specifications and power consumption requirements.关键词：400GE;VCSEL;PAM;DMT
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发布时间： - 摘要：For the development of a temperature sensor with still higher sensitivity,this paper proposes to selectively fill thermosensitive fluid into the PCF by using the photonic bandgap effect so as to achieve highly sensitive temperature sensing.It calculates the bandgap using the full vector plane wave expansion method and the bandgap and its width drift regularly with temperature.When the thermosensitive fluid is selectively filled in the different locations and structures of the cladding air holes it is found that when only the inner air holes are filled,the variation caused by the bandgap with temperature drift is the maximum;When the 1st-layer air holes of the cladding is filled with the fluid,the lattice periodΛ =9μm and air-filling ratio are repectively selected as d/Λ = 0.9and d/Λ = 0.5,the temperature sensitivity in bandgap boundary wavelength detection and band-gap width detection can be 22.07 and 7.01nm/℃ respectively,which shows the advantages in high accuracy and simple system structure.关键词：fiber optics;PCF;temperature sensor;selective liquid filling;photonic bandgap
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发布时间： - 摘要：With the rapid increase of the integration degree and working frequency of electronic devices as well as their wiring density and signal frequency,signal delay and poor electromagnetism compatibility will inevitably occur in copper wire-connected electric interconnections.In order to satisfy the requirement for the processing and transmission of high frequency signals and data and in view of the advantages of high optical transmission frequency and resistance to electromagnetic interference,we conducted researches on the photoelectric substrate layout and fabrication technologies and the optoelectronic signal transmission and detection technology by using the microfiber with the traditional substrate fabrication technology,broke through such key technologies as fiber embedding and photoelectric coupling and finally solved the problem of fiber-embedded photoelectric substrate fabrication.The fiber-embedded optoelectronic interconnection technology can effectively break the bottleneck in the interconnection of high frequency signals in the course of transmission and processing,ensuring the development of new generation informationized equipment.关键词：fiber-embedded technology;photoelectric coupling;anti-electromagnetism interference
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发布时间： - 摘要：Although the time-domain statistic channel model is at present given in the IEEE Ultra-Wideband（UWB）standards,the frequency-domain characteristics of channels are not reflected distinctly.However,they have critical impacts on UWB channel capacity,ranging precision,etc.Therefore,the frequency-dependent path loss of UWB Non-Line-of-Sight（NLOS）environment is modeled and frequency-dependent path loss indexes is fitted on the basis of the measured data,the variation law of frequency-domain attenuation in the NLOS transmission environment is obtained.The study results indicate that the high-frequency statistical attenuation characteristics are especially evident in the indoor NLOS environment,which is obviously different from the normal analytical results.The analysis method and conclusions in this paper have fairly strong instructive significance to the evaluation of UWB communication capacity and ranging precision in different NLOS environments.关键词：UWB;measured data;frequency characteristics
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发布时间： - 摘要：This paper simulates and analyzes the transmission characteristics of Non-Line-Of-Sight（NLOS）ultraviolet（UV）light in radiation fog environment on the basis of a multiple scattering model by using the Monte-Carlo method.Then it selects a UV light with a wavelength of 260 nm and analyzes the relationship between the path losses and geometric dimensions of UV in atmospheric transmission channels and the communication distances in radiation fog environment when visibility is given,obtaining the most optimized geometric parameters by simulation and analysis.Furthermore,it analyzes the relationship between the UV light path loss and the visibility in different communication distances.The results show that when the communication distance and the transceiver system geometric dimension parameters are known,there exists a value of visibility to enable the path loss of the UV light transmission to be the minimum.关键词：NLOS;Monte-Carlo method;visibility;radiation fog
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发布时间： - 摘要：A multiple antenna transmission technology is introduced in the uplink of LTE-A systems to solve the problem of the limited number of end-user antennas.In such technical background,an adaptive algorithm for uplink transmission mode is designed to improve the system performance.The adaptation is discussed in three aspects,i.e.between transmission modes,single-dual stream and between MU-MIMO and single antenna transmission.The system simulation results show that selection of proper transmission mode in line with the changes of the channel conditions for the base station can effectively reduce the user BER and improve the system throughput.关键词：LTE-Advanced;uplink;adaptation;system simulation
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发布时间： - 摘要：In view of the emergence of mega data signals in wireless communication networks in recent years,this paper properly compresses these signals while performing signal sampling and realizes their reconstruction with small amount sampling value or observed value by using an appropriate reconstruction algorithm.On the basis of the original Orthogonal Matching Pursuit（OMP）-based compressed sensing reconstruction algorithm,the Alternating Step-size（AS）is introduced and an improved algorithm,i.e.GP-OMP algorithm proposed.Experimental results show that the spectrum information this algorithm obtained by using the previous sensing moment can not only effectively reduce the amount of computations by the reconstruction algorithm,but also the reconstruction time,with almostthe same results as those by using the original method.关键词：reconstruction algorithm;compressed sensing;alternately step;spectrum sensing
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