最新刊期
卷 ， 期 4 ， 2007
- 摘要：The concept of Shared Risk Link Group（SRLG） is introduced in optical networks,in which the work path and the protection path should be SRLG-disjoint.A novel dynamic shared-path protection algorithm called Dynamic Link Weight Configuration（DLWC） algorithm based on SRLG constraints is proposed.The key to this algorithm is the definition of two dynamic weights of a link,which can be used to synthetically cope with three essential problems,i.e.SRLG constraints,dynamic loading balance and trap in calculating the work path and the protection path.关键词：SRLG;shared-path protection;loading balance;trap;WDM mesh network
- 2
- |
- 153
- |
- 1
发布时间： - 摘要：In this paper,a systematic study is made of the integrated restoration of dynamic self-similar traffics in multifiber IP/WDM networks.Three integrated restoration strategies are proposed and the implementation of the algorithms is based on an extended Multifiber Layered Graph Model. Through extensive dynamic simulations,the performances of the above strategies,which are determined by the traffic interruption ratio and restoration efficiency,are studied under different parameters（Hurst,Mean and Variance） of the self-similar traffic model.By comparison and analysis,it is concluded that Integrated Path Restoration（IPR） is the best of the three restoration strategies.关键词：integrated restoration;self-similar;layered graph model;IP over WDM
- 2
- |
- 107
- |
- 1
发布时间： - 摘要：The notion of statistical traffic envelope is capable of expressing various types of network traffic with a uniform formulation, which leads to general results of statistical performance analysis.In this paper,we survey various formulations of statistical traffic envelope,and summarize the implications and limitations of these definitions.Open issues are also presented for further study and application.关键词：traffic modeling;statistical traffic envelope;local statistical envelope;global statistical envelope;strong global statistical envelope
- 2
- |
- 158
- |
- 1
发布时间： - 摘要：In view of the working principle of the optical WDM network,the concept of directional P-cycle is presented and the directional P-cycle-based protection mechanism and deployment strategy expounded.Then the coupling cycle joint method and a heuristic algorithm for the growth of P-cycles and network protection resource deployment based on this method are proposed.Finally,simulations are conducted in COST239 and NSFnet topologies on the ASON-WDM platform set up by using OPNET Modeler.The results show that the algorithm and the deployment strategy are effective and feasible.关键词：optical WDM network;survivability;directional P-cycle;coupling cycle;capacity efficiency
- 2
- |
- 106
- |
- 8
发布时间： - 摘要：In the previous studies,all-optical wavelength conversion is actuated by using light conversion and there has been no relevant report about the use of idle light.It has been found that by simulating the effect of coupling attenuation on all-optical wavelength conversion,all-optical wavelength conversion by using both light conversion and idle light can be realized respectively by adjusting coupling attenuation under the condition of different pump light and signal light powers.关键词：all-optical wavelength conversion;Four-Wave Mixing（FWM）;semiconductor optical amplifier（SOA）;OptiSystem
- 2
- |
- 118
- |
- 0
发布时间： - 摘要：The influences of losses in optical transmission systems on carrier optical signal propagation are studied by using the conservation law and the viral theorem of the nonlinear system in this paper.The results indicate that the soliton amplitude slightly decreases in the border between the Single-Mode Fiber（SMF） and the Dispersion Compensation Fiber（DCF）,but and its shape remains unchanged,while its signal amplitude is amplified when it passes an amplifier and its shape automatically restored.Such a signal can be transmitted with high fidelity and has the haracteristics of an ideal information carrier.关键词：nonlinear optics;optical soliton;dispersion management;high fidelity
- 4
- |
- 139
- |
- 1
发布时间： - 摘要：In this paper,small wavelength set required to accomplish the task in the existing network structure is first identified by using greedy algorithm.Then a multicast tree is generated on the basis of each link weight by using the most short-circuit path algorithm to enable lower hops and obstruction rate so as to ensure fast and effective data transfer when smaller amount of wavelength resource is used.关键词：greedy algorithm;WDM network;multicast tree;routing algorithms
- 2
- |
- 106
- |
- 0
发布时间： - 摘要：In view of the large-amplitude and low-frequency jitters induced by pointer adjustment at the boundary between SDH and PDH networks,a sequence modulation-based adaptive jitter suppression scheme is presented on the basis of the existing research results.Adopting bit leakage cycle adaptive modulation based on statistical prediction combined with buffer storage monitoring,it can effectively avoid buffer storage overflow caused by the operating mode changes of networks with the same polarity.The design principle for implementing sequence modulation is given and the bit leakage cycle and sequence modulation time in both normal and degraded modes calculated.Simulation and practical applications have shown that by this scheme pointer adjustment jitters can be easily and effectively suppressed.关键词：pointer adjustment;jitter;adaptive bit leakage;sequence modulation
- 2
- |
- 48
- |
- 0
发布时间： - 摘要：This paper explores the construction and development of MAN on the basis of its present status,structures,supported services and the principal technologies applied in its construction.In the status analysis,it focuses on the drawbacks of the existing MAN,and then discusses the characteristics of the principal technologies in MAN construction,i.e.MSTP,Metro WDM transmission and ASON.Finally,it envisages the practical methods in future MAN construction.关键词：MAN;SDH;MSTP;CWDW;ASON
- 2
- |
- 158
- |
- 17
发布时间： - 摘要：With the enhancement of social informationization,the interconnections and interworking between domestic appliances and between homes and the outside world is becoming a hot research point.It is against such a background that home networking comes on the scene.First we give a brief introduction to home networking,residential gateway and the middleware.Then,we describe the usages,functions and structural drawings of the gateway and its middleware.Finally,we study the implementation of the middleware by importing the OSGi framework.关键词：Home Networking（HN）;Residential Gateway（RG）;middleware;Open Service Gateway Initiative（OSGi）
- 2
- |
- 181
- |
- 8
发布时间： - 摘要：By analyzing the relationship between the request and allocation of contention in IEEE802.16,this paper proposes a dynamic allocation algorithm of contention slot.Compared with the fixed allocation,the proposed algorithm can effectively improve the utilization efficiency of uplink bandwidths and decrease the delay brought about by contention request.The simulation results show the proposed algorithm can effectively use the uplink bandwidths of the system under all kinds of load conditions.关键词：contention request;contention slot allocation;IEEE802.16
- 2
- |
- 113
- |
- 1
发布时间： - 摘要：IP multimedia subsystem（IMS）,the core of NGN,and the characteristic of its architecture are first introduced and the reasons why it is applicable to the convergence of networks and services explained.Then the services offered by using its architecture and an IMS-based multiservice mobile platform are analyzed.Finally,in connection with the technical characteristics of IPTV and the problems occurring in the convergence,a scheme in which IPTV is applied on the IMS mobile platform is proposed.关键词：IMS;convergence;IPTV
- 2
- |
- 134
- |
- 2
发布时间： - 摘要：A novel Optical Add/Drop Multiplexer（OADM） based on the tunable F-P cavity filter is presented.Its crosstalk characteristics are analyzed and calculated in detail and measures for improvement proposed.In the experiment,the spectral line width and insertion loss of the downloaded wavelength are only 0.18 nm and 4.2 dB respectively;the channel isolation is greater than 26.5 dB and the Free Spectral Range（FSR） wider than 33 nm.The OADM is characteristic of simple structure,high isolation,precision tuning,small insertion loss,low cost and low power consumption and can be widely used in the existing DWDM systems.关键词：optical communication;DWDM;F-P cavity;OADM;crosstalk
- 2
- |
- 217
- |
- 2
发布时间： - 摘要：This article presents a design scheme for ASIC chips used for 60 Gbit/s broadband circuit switching.A pipeline design concept and optimum structuring technology are put forward for fast-speed,large-size and high-power-consumption chips.The circuit functions are verified with altera FPGA chips and the results of the verification and its ASIC synthesis with Synopsys DC are given.关键词：ASIC;FPGA;SDH;circuit switch
- 4
- |
- 67
- |
- 1
发布时间： - 摘要：The Photonic Crystal Fiber（PCF）is pressuresensitive.In this paper,the relationship between the strain and stress in PCF is deduced by elasto-optical theory and the quantitative fluctuations of its refractive index distribution under pressure obtained.The schematic design of a microbend pressure PCF sensor is presented and the phase fluctuation of the optical pulses transported in PCF under pressure and the detecting principle for such a sensor are theoretically analyzed.关键词：fiber-optic sensing;PCF;sensor;refractive index distribution;phase fluctuation
- 2
- |
- 387
- |
- 0
发布时间： - 摘要：Two factors affecting covert tapping are first investigated by deducing the fiber bending loss formula.Then on this basis,the framework of the tapping system is designed,a fiber-optic experimental tapping system set up,covert tapping realized and the optimal bending radius value for realizing covert tapping gained.Finally,considering the features of covert tapping,and making use of the fact that the bending loss of long wavelength signals are much greater than that of normal communication wavelength signals under the same conditions,an effective tap detection method is proposed with improved system detection sensibility.关键词：covert tapping;bending loss;long wavelength detection
- 2
- |
- 391
- |
- 2
发布时间： - 摘要：As a new type of optical fiber,Photonic Crystal Fiber（PCF） has attracted extensive attention because it is different from ordinary fibers in both structure and lightguide mechanism and shows many characteristics that cannot be found in conventional fibers.Moreover,its unusual characteristics have expanded its application areas and sensors with superb performances can be produced by utilizing some of these characteristics.In this paper,its basic concept and main characteristics are introduced and several applications in sensors described.关键词：PCF;pressure sensor;gas sensor;temperature sensor
- 2
- |
- 558
- |
- 1
发布时间： - 摘要：This paper studies and analyzes the transient response of Erbium-Doped Fiber Amplifier（EDFA） to fast channel adding/dropping process in DWDM networks and offers a fast digital control scheme with the combination of electrical feedforward and feedback based on Digital Signal Processor（DSP）.The experimental result shows that this method can be used to significantly suppress the power/gain excursions caused by the said process.关键词：DSP;EDFA;auto-gain-control;transient dynamics
- 2
- |
- 129
- |
- 2
发布时间： - 摘要：Design optimization of a novel triplexer chip structure based on Planar Lightwave Circuit（PLC） for fiber-to-the premise applications is described,calculations of the spectral responses of the unit structure performed and the technological tolerance of the structure analyzed by numerical simulations.The results show that triplexer chips with high tolerance and improved spectral response can be fabricated by using two-mode couplers and Mach-Zehnder interferometer.关键词：tri-directional device;PLC;two-mode coupler;Mach-Zehnder interferometer
- 2
- |
- 111
- |
- 0
发布时间： - 摘要：Theoretical analysis and numerical simulation of an all-fiber pulse compressor composed of Dispersion-Compensation Fiber（DCF）,Dispersion-Shifted Fiber（DSF） using distributed Raman amplification and Nonlinear Optical Loop Mirror（NOLM） are performed in this paper.The results show that the chirps in optical pulses can be eliminated through DCF,creating favorable conditions for compression,the pulses are highly compressed through DSF using distributed Raman amplification and at last their pestles are removed through NOLM.By using such a compressor,optical pulses with high compression rate and better compression effect can be achieved.关键词：DCF;DSF;NOLM;Raman amplification;pulse compression
- 2
- |
- 95
- |
- 0
发布时间：
- Postal code：430205
- Technical support is provided by Beijing Founder electronics co., LTD 鄂ICP备2022010197
鄂公网安备 42011202002092号 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
- Total Visits：75845
0