最新刊期
卷 ， 期 1 ， 2014
- 摘要：As a result of 40years effort,right now,China is the largest optical communication country in the world.In this paper,the development situation of optical communication technologies in China and its level compare with world level,the application status of optical communication technologies in China,the development situation of optical communication industries in China and its main problems have been introduced.关键词：optical communications;optical fiber communications;optical communication technologies;optical communication industries
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发布时间： - 摘要：The paper will introduce a design and implementation of the PCE hardware based on embedded Linux system.This system is chiefly used in the tests of PCE+network management architecture in optical networks and in the interconnection/interworking between devices in multi-domain/multi-layer heterogeneous optical networks and path computations.In consideration of the requirements of PCE development and the characteristics of embedded systems,a board support package is preloaded for the system users to boot the hardware.Furthermore,in this paper,the similarities and differences and advantages and disadvantages are compared against the requirements of the PCE architecture and then the design,implementation and initiation are described in detail and an operable PCE test case and parts of the experimental results are given.关键词：optical network;path computation element;embedded operating system
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发布时间： - 摘要：As previous heuristic p-cycle capacity allocation algorithms fail to consider the limitation of link capacity,we propose a new heuristic algorithm.On the basis of spare capacity,this algorithm constructs a p-cycle by taking the maximum working capacity as the expansion standard and uses the constructed p-cycle for capacity allocation and uses COST239network topology for algorithm simulation.The simulation results show that this algorithm can use less spare capacity to protect more working capacity and reduce the number of p-cycles.关键词：optical network;survivability;P-cycle;heuristic algorithm;capacity allocation
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发布时间： - 摘要：As the waveband granularity of uniform waveband switching is fixed and deficient in flexibility and extensibility,this paper presents a novel multi-granularity optical cross-connection architecture and on the basis of this architecture a Flexible and Extensible Non-uniform waveBand Switching（FENBS）algorithm.When there is a smaller number of path-overlapped traffics, they are grouped into smaller granular wavebands,and when there is a larger number of such traffics,they are grouped into larger granular wavebands so that waveband grouping becomes more flexible than uniform waveband switching,thus enabling more traffics to be contained in the waveband and saving the port.Simulation results show that fewer ports are occupied when the FENBS algorithm is used than when uniform-granularity Balanced Path routing with Heavy Traffic first waveband assignment（BPHT）algorithm is used.关键词：waveband switching;node architecture;non-uniform;port
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发布时间： - 摘要：Attack protection is an important issue for optical networks.In this paper,an attack propagation model for high-power inter-channel crosstalk attacks in optical networks and optical amplifier gain competition attacks is constructed and a Routing and Wavelength Assignment（RWA）algorithm for limiting the scope of the physical layer attack influences proposed.In the routing assignment stage,this algorithm assigns the routing with smaller maximum light-path attack scope to the light-path request so as to reduce the scope of attack influences.Simulation results show that compared with commonly used algorithms, this algorithm can effectively limit the scope of physical layer attack influences and improve the security of optical networks.关键词：optical network;inter-channel crosstalk attack;gain competition attack;RWA
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发布时间： - 摘要：In order to better monitor metro Ethernet performance parameters,this paper proposes a method in compliance with ITU-T Y.1731standard,i.e.User-Definable Automatic Performance Monitoring（UDAPM）.It introduces the principle of performance parameter testing,expounds the principle of implementing the specific performance monitoring by the UDAPM module and analyzes its concrete design scheme.The experimental results indicate that this method is feasible as users can set the minimum time interval and relevant parameter threshold values and display the historical and real-time monitoring results. Its superiorities can be seen in the comparison with ITU-T Y.1731standard in several performance indexes.关键词：ITU-T Y.1731standard;Ethernet performance monitoring;UDAPM;minimum time interval
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发布时间： - 摘要：Electric power backbone optical transmission network is the basic infrastructure for power dispatching and information exchange by electric power companies and improving its survivability is the focus of research in recent years.In connection with the requirement of protecting electric power backbone optical transmission networks,this paper proposes a Suurballe algorithm-based Dedicated Protection（SDP）algorithm.Simulation results indicate that SDP has lower blocking probability and resource occupancy rate than the traditional Dijkstra algorithm-based Dedicated Protection（DDP）algorithm,more suitable for the grid services that need dedicated protection.关键词：backbone optical network;survivability;dedicated protection;RWA
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发布时间： - 摘要：In view of the obvious deficiencies of the traditional pre-configured cycle（p-cycle）protection algorithm for the new Optical Transport Network（OTN）in protection efficiency and resource utilization,this paper presents an improved algorithm. As there are different workloads in two ways of links,this algorithm improves the resource utilization rate by prioritizing the selection of jumping links and increases protection efficiency in the case of limited resources.Simulation results in pan-European COST239network show that this new algorithm significantly increases the resource utilization and is superior to the traditional p-cycle protection algorithm in protection efficiency.关键词：OTN;survivability;P-cycle;difference ratio;volumetric efficiency
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发布时间： - 摘要：This paper investigates a replica-constrained spray and wait routing algorithm in Delay-Tolerant Network（DTN）and in view of the disadvantages of the spray and wait routing algorithm,it introduces a node-density adaptive routing algorithm. This algorithm adaptively distributes message replicas according to the node density of current area and improves the wait stage of the spray and wait routing algorithm so that the messages are carried by active nodes.The simulation results show that compared with BSW algorithm and the classical Epidemic algorithm,the proposed algorithm can effectively reduce transmission delay and improve the success rate of message delivery.关键词：DTN;routing algorithm;node density;spray and wait
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发布时间： - 摘要：With the increase of transmission range and rate,optical amplification and dispersion management have become important factors in fiber-optic communication systems.Specifically,in the gradual replacement of 10Gbit/s fiber-optic communication systems by 40Gbit/s systems,still higher requirements are placed on nonlinear resistance and dispersion management by communication systems.In this paper,three dispersion management schemes are compared and the effects of the input optical power in different schemes on the Qvalue,BER and SNR of 40Gbit/s fiber-optic communication systems discussed.It is found that the dispersion compensation scheme with mid-amplification has better Qvalue and SNR and is more suitable for ultra-long fiber-optic communication systems.关键词：dispersion management;nonlinearity;optical amplification;Qvalue
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发布时间： - 摘要：This letter first introduces the evolution of the manufacturing technologies for G.657single-mode optical fibers. Then it presents the"Three-Step"preform technology for manufacturing bend-insensitive G.657single-mode fibers and designs and fabricates two types G.657fibers,G657A2and G.657B3.They are tested respectively.When the bending radius of G657A2fiber is 7.5mm,its bending losses at 1 550and 1 625nm wavelengths are 0.063and 0.136dB respectively and its attenuation coefficients at 1 383and 1 550nm wavelengths are 0.272and 0.188dB/km,while when the bending radius of G. 657B3fiber is 5mm,its bending losses at 1 550and 1 625nm wavelengths are 0.067and 0.122dB respectively and its attenuation coefficients at 1 383and 1 550nm wavelengths are 0.276and 0.182dB/km respectively.The test results indicate that the presented technology produces high bend-resistant low-loss small bending-radius single-mode fibers and their key specifications are all better than the ITU-T G.657standard.关键词：optical fiber;bend-insensitive;three-step method;preform;manufacture;Process
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发布时间： - 摘要：In order to detect the fault types of 110kV XLPE photoelectric composite submarine cable across a certain strait,a diagnosis method of using the fibers in the cable is proposed.In this method,the IEC standard,Power Systems Computer Aided Design（PSCAD）software and ANSYS software are first used for the calculation and simulation of the temperature of the submarine cable in different faulty conditions.Then,the fiber temperature data are extracted from this cable temperature data,the fiber temperature changes in different faulty conditions analyzed and the relationship between the fiber temperature changes and the cable fault types derived.Finally,the effects of the fault position on the fiber temperature changes are analyzed.The analytical results show that this method can successfully detect the fault types of submarine cables and has significant reference values for their fault detection.关键词：photoelectric composite submarine cable;fault detection;fault type;temperature detection;fault analysis
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发布时间： - 摘要：In this paper,a novel high birefringence Photonic Crystal Fiber（PCF）is proposed and its birefringence,dispersion, nonlinearity,confinement loss and mode field numerically analyzed.The study shows that when its structural parameters are optimized,its birefringence value is 2.36×10-2,negative dispersion value-7 740ps/（km·nm）,and the nonlinear coefficient is 56km-1·W-1,the corresponding area of mode field 2.17μm2,and the confinement loss in the fundamental mode is only 0.10dB/km at wavelength of 1.55μm,while its dispersion slope fluctuates between-21.9-23.5ps/（km·nm2） over the C band.This type of fiber will be widely applied in fiber lasers,fiber amplifiers and optical filters and sensors in the future.关键词：PCF;birefringence;dispersion;nonlinearity
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发布时间： - 摘要：After ten years of rapid development,the optical fiber sensor industry in China has gradually become mature,normalized and standardized.Based on the current situation of the development of Chinese optical fiber sensor market,the author analyzed the characteristics of optical fiber sensor industry,and discusses the market prospective direction of the fiber optic sensor industry.关键词：optical fiber sensing;smart city;Internet of things
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发布时间： - 摘要：In order to obtain photonic lattices with high diffraction efficiency,we write a one-dimensional photonic lattice into LiNbO3:Fe crystal by using the method of light-induced photonic lattices.Furthermore,we study the minimum value of the density of the written crystal lattice period and the relationship between the crystal lattice period and diffraction efficiency,and compare the cases when lasers at different wavelengths are used to write.Experimental results show that when the writing period is the minimum,it is one half of the incident wavelength and at this moment two beams of incident light form a standing wave.We find that the diffraction efficiency is higher within the included angle between the two teams of 20°and lower over 25°.We conclude that in order to obtain photonic lattices with high diffraction efficiency,the included angle should be within 20°and short wavelength lasers used as the irradiation light source.关键词：nonlinear optics;light-induced photonic lattices;LiNbO3 ∶Fe crystal;crystal lattice period;diffraction efficiency
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发布时间： - 摘要：<正>不久前,烽火通信"多维复用光通信光纤研究"和"大容量OAM传输光纤研究"两个国家"九七三"计划项目顺利获得科技部立项批复,这是烽火通信首次两个项目同时获得光纤领域国家"九七三"计划课题重点资助。至此,烽火通信在光纤领域共获得5个"九七三"计划课题支撑。烽火通信在下一代光纤通信前沿基
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发布时间： - 摘要：In order to reflect the switch-over failure rate of the Long Term Evolution（LTE）networks more accurately,this paper proposes an implementation scheme in accordance with their control plane signaling process.Based on the statistiics of the source eNB,it designs the statistical process of the switch-over failure in accordance with the type of the switch-over in the LTE systems and the cause of the failures.This scheme can produce an accurate statistical number of the failure and the failure rate and has them diplayed on the Operation and Maintenance Center（OMC）interface,thus enabling the network operators to know in time the switch-over performance in the TD-LTE systems.关键词：LTE system;OMC;switch-over failure;switch-over performance
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发布时间： - 摘要：As wireless sensor networks are characteristic of high requirements for energy and limited node energy,this paper presents a scheme for improving the hybrid routing technology in wireless sensor networks so as the prolong their life cycles. The analysis of the simulation results of the hybrid routing protocol shows that compared with other routing protocols,the proposed one can effectively reduce the node broadcasting redundancy,thus prolonging the network lifetime,increase the data transfer rate and reduce the transmission delay,more suitable for large-scale wireless sensor networks.关键词：wireless sensor network;routing;energy
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发布时间： - 摘要：For the fast forwarding of the data between the control and data planes of Access Controllers（AC）on the basis of a multi-core FastGate software platform,this paper makes an in-depth analysis of the reason of the synchronization of neighbor table information between the control and dataplanes of wireless AC platform and introduces the basic principle of the synchronization.Furthermore,it proposes a scheme appropriate for such synchronization and implements it in programming.Experimental results indicate that this scheme can achieve the desired synchronization.关键词：AC;control plane and data plane;neighbor table;synchronization
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发布时间： - 摘要：In order to minimize such problems as breakdown,long communication recovery time and large network load occurred when the destination node in the classical Ad hoc On-Demand Distance Vector（AODV）routing protocol departs from the node originally in direct communication as it moves randomly within the established scope covered by the routing link signals,this article studies the implementation of fast routing repair by activating the communication handover from the intermediate node to the destination node using the AODV Hello messages,and obtains an improved routing protocol,AODV-L.Simulation results show that this AODV-L protocol reduces the network load and shortens the routing repair time,more suitable for networks that the destination node randomly moves within the scope covered by the routing link signals and that the internode communication has higher real-time performance.关键词：Ad Hoc network;AODV;Hello message;route maintenance
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发布时间： - 摘要：This paper studies the highly efficient routing protocols in wireless sensor networks and analyzes in detail the rule of cluster head selection for a classical hierarchical routing protocol,i.e.Low Energy Adaptive Clustering Hierarchy（LEACH） protocol and the clustering algorithm and points out the limitation of this algorithm.In view of the different cluster head node positions,it presents an improved algorithm for the multi-hop relay transfers between the cluster heads.Simulation results prove that the network survival time in this improved algorithm is better than that in the LEACH algorithm.关键词：wireless sensor network;routing protocol;LEACH;cluster head
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