最新刊期
卷 ， 期 6 ， 2004
- 摘要：The paper introduces the photonic crystal （PC） and the photonic crystal fiber （PCF） in terms of theory and conception, with the emphasis on light-guiding principles, novel properties, applications, recent progress and prospect of PCF.关键词：photonic crystal（PC）;photonic crystal fiber（PCF）;holey fiber;photonic bandgap fiber
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- 282
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发布时间： - 摘要：40 Gbit/s single channel system transmission over 480 km of G.652 fiber without electronic regeneration is introduced in the paper. In this work ,we employ NRZ format ,distributed Raman amplification（DRA）. No FEC technology is used in the system. After transmission over 480 km, the OSNR of MPI-R is more than 29 dB,the sensitivity of receiver is about -22.3 dBm at BER=10-12.The system has run error free continuously for 12 hours.关键词：OSNR;dispersion compensation;BER;DRA
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- 67
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发布时间： - 摘要：With the rapid development of WDM technology, the requirements of survivability of optical networks are increasing more and more. Some protection methods are given in this paper, and their features and applications field are analyzed too. In addition, comparison and analyses of these methods are given, which include the resource utilization, cost, the time of protection, the requirements of node and network topology. Conclusion can be drawn that different protection methods should be adopted according to different networks and survivability requirements.关键词：survivability;protection;restoration;APS
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- 228
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发布时间： - 摘要：All-optical metwork of WDM is the core of next generation backbone network. This paper studied the protection mechanism for virtual ring in mesh topology, and analyzed a construction algorithm for a virtual ring based on spanning tree. This algorithm can be used in all kinds of mesh topologies, it has good adaptivity, and can avoid the issue of searching in Hamilton circle.关键词：spanning tree;P-cycles;mesh network
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- 93
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发布时间： - 摘要：ASON is the research focus of NGN,with the developing of the ASON technology ,the demand on ASON management system became stronger and stronger. This paper gave a analysis of of ASON management system ,then presented a realization scheme of unified network management system in optical network it.关键词：ASON;management plane;management system
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- 59
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发布时间： - 摘要：A traditional restoration technique based on link is introduced and its defects are shown in this article. Moreover, a modified distributed restoration algorithm is presented, which can solve not only link failures but also node failures. By simulation, the technique shows great performance in terms of restoration time and resource utilization.关键词：optical network;network survivability;restoration algorithm;single-link failures;lightpath
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- 93
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发布时间： - 摘要：Ethernet passive optical networks are being considered as a promising solution for next-generation broadband access network. In this paper, we propose a new algorithm of dynamic bandwidth allocation for multimedia services over Ethernet PONs. To implement the suggested dynamic bandwidth allocation algorithm, we present control message formats that handle classified bandwidth in a multipoint control protocol of Ethernet PONs.
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- 88
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- 2
发布时间： - 摘要：By the aid of the description method of the network model of ITU-T and the thinking of the recommendation about Ethernet over transport network,this paper introduces some conceptions of connectionless transport network,analyses and summarizes the layer model and characteristics of connectionless transport network chiefly.关键词：connectionless transport network;layer network;characteristics of network
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- 30
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发布时间： - 摘要：This paper introduces the application reference model of providing circuit emulation services over Ethernet, and then states the technical requirements of this service. Finally, the paper gives a method to provide some typical schemes of realization of circuit emulation services over Ethernet.关键词：Ethernet;circuit emulation;TDM;SDH
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- 84
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- 2
发布时间： - 摘要：This paper introduces the structure and routing algorithm of ShuffleNet multihop network and proposes a new TDM network equivalent to ShuffleNet multihop network and its routing algorithm. At last we analyze the performance of an 8-node ShuffleNet based on OTDM.关键词：OTDM;ShuffleNet;multihop;DSB structure
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- 64
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发布时间： - 摘要：FEC has been applied into the high-speed fiber-optical communication for further improvement of transmission performances of the optical network. The performance of SDH/DWDM network are simply analyzed in this paper. The FEC technology and its improvement to BER are also discussed.关键词：forward error correction（FEC）;SDH;WDM;BER;performance
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- 176
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发布时间： - 摘要：In this paper a solution about simulation of single-mode digital lightwave communication links is given. The model of signal, model of fiber and model of components are analysed respectiverly, furthermore the BER and eye diagram for evaluateion of the performances of system are analyzed.关键词：optical fiber;simulation;BER;eye diagram
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- 220
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发布时间： - 摘要：Based on the foundational control procedure of calling for SIP protocol, and by the use of the analysis of the flow chart and state diagram, this paper discussed on the method for the design implementation of SIP protocol.关键词：NGN;softswitch;SIP;software design
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- 166
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发布时间： - 摘要：This article presented a brief introduction to the background of emergence of next generation network （NGN） and its features, with the emphasis on the core technique of NGN —— softswitch. This paper described the NGN in terns of its conception, development status, the benefits the NGN brings about to the telecommunication operators, and its market prospect. At the end of this paper, the problems presented in softswtch technique are outlined.关键词：NGN;softswitch;market prospect
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- 176
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- 8
发布时间： - 摘要：Routing code analysis table is used to map the route code to the destination address. Nowadays there are two methods to construct the analysis table: single table and multiple table. This article analysed the features and the trends of mobile communication. We compare the two kinds of tables using the simulation results. After analysis of the results in the time and space domain of the emulation, we validated that the single table can be used in the specifical mobile switch.关键词：routing table;mobile communication;softswitch;switch
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- 45
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发布时间： - 摘要：Making a brief analysis of local transport network of Gansu Unicom and considering the shortcomings of current networks, we put forward the targets and principles of the network optimization, and presented the concrete measures and guiding ideology for the choise of technologies and equipments in the course of network optimization. At the end of this paper, we described the concrete optimization scheme of local transport network of Gansu Unicom.关键词：transport network;network optimization;MSTP;SDH
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- 46
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发布时间： - 摘要：Recently,the technology of vector graphics has been rapidly advanced. Especially, all kinds of application softwares try to optimize its graphical user interface with SVG format after W3C recommended the open specification of SVG. This paper introduced two basic graphics theories, then analysed a series of advantages of SVG, finally presented the study on optimization of communication network GUI with SVG technology.关键词：graphical user interface（GUI）;vector;SVG;topological graph
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- 134
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发布时间： - 摘要：Since 1963, with the requirement of the task under the iron tower, some country have started to research the distributing electric field and its biology effect on power line. In China, someone analyzed the distributing electric field of power line by numerical mathematics without iron tower. This method may cause error. In this paper, the analysis and prediction for the 3-dimension distributing electric field of power line by matrix mathematics with iron tower is provided, the comparison of the computing results with this method with the field testing results showed that these results are effective. These results can be used in the domestic construction of power line communication network in the future.关键词：ADSS;power line iron tower;ultra high voltage power line;optic fiber communication;power line communication
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- 72
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- 2
发布时间： - 摘要：This paper introduces a kind of laser source with APC, ATC and modulation interface.It improves the output characteristics of LD by outside circuits.That includes the modulation wave through high-speed photodetector, the relationship between modulation frequency and threshold current, and the relationship between average output power and modulation frequency.关键词：semiconductor lasers;direct-modulation;modulation frequency
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- 457
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- 13
发布时间： - 摘要：The study of rare-earth doped fiber amplifier is very important for broadening the bandwidth of fiber communication system. In this paper, the principle of rare-earth doped fiber amplifier including Er3+、Tm3+、Pr3+、Dy3+、Ho3+、Nd3+ is introduced, and the recent development in this field is also reviewed.关键词：rare-earth doped;fiber amplifier;bandwidth broadning
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- 374
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发布时间： - 摘要：A wide range and high accuracy dark current test system using logarithmic converter is designed and produced based on galvanometer common model. The sensitivity is as high as 0.1pA, which is better than that of other current test instruments in China. It works well in measuring photo-detector dark current, weak optical power and high resistance. Utilizing a computer, the dark current test system can have more functions.关键词：logarithmic converter;Dark current;dynamic range;sensitivity
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- 119
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