最新刊期
      卷 ， 期 4 ， 2005
      • HE Yan~
        Issue 4, Pages: 1-4(2005) DOI: 10.13756/j.gtxyj.2005.04.001
        摘要：By using the remote ONU and the multiple logical link identification （LLID） technology, merging the multiservice management and remote equipment management of EPON into a new framework, and connecting the SLA with links to distribute the services over links, it is possible to realize the bandwidth guarantee of system and the strict control of delay and jitter, thus overcoming the deficiency of best-effort forwarding in Ethernet, obtaining a better solution for EPON multiservice access capability.  
          
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      • LI Pei-yuan~1,L Wei~1,GU Wan-yi~1,ZHOU Xi-zeng~2
        Issue 4, Pages: 5-7(2005) DOI: 10.13756/j.gtxyj.2005.04.002
        摘要：In this paper, we analyzed and studied the performances of the network with sparse wavelength conversion under dynamic service model, presented the systematic simulation for the performances of the network after introduction of wavelength converters, and analyzed the effect of several factors （such as the quantity of wavelength converter, the converter placemend, the wavelength conversion range, and the routing and wavelength assignment algorithm） on the network performauces.  
          
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      • BO Ming-xia,GONG Yong-tao,ZHONG Jing-shun,GU Wan-yi
        Issue 4, Pages: 8-11(2005) DOI: 10.13756/j.gtxyj.2005.04.003
        摘要：The dynamic routing and wavelength assignment issues in WDM optical networks under self-similar traffic are studied. Through simulation in three representative network topologies, the dynamic performance analysis of self-similar traffic in WDM optical network is presented. In addition the dynamic performance is compared between self-similar traffic model and the Poisson traffic model under the same condition.  
          
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      • CHEN Da-feng,LI Pei-yuan
        Issue 4, Pages: 12-14(2005) DOI: 10.13756/j.gtxyj.2005.04.004
        摘要：In practical applications, the reliability of control plane in GMPLS based on IP network couldn’t satisfy the telecom level requirements of ASON, in view of this condition ,this paper discusses extensions to RSVP-TE of GMPLS, in order to accomplish the function of excluding route when setting up a protect route, we extend two objects: Exclude Route Object （XRO） and Explicit Exclude Route Subobject （EXRS）.  
          
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      • SUN Jie~1,ZHANG Lin~2
        Issue 4, Pages: 15-17(2005) DOI: 10.13756/j.gtxyj.2005.04.005
        摘要：RSVP-TE is one of the main signaling protocol in control plane of ASON. In this paper, we overviewed the hop-by-hop message distribution method commonly used in RSVP-TE, then discussed a rapid paralled message distribution manner, described in detail its application condition and its merits and demerits in relation to conventional method.  
          
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      • GUO Zhi-xia
        Issue 4, Pages: 18-20(2005) DOI: 10.13756/j.gtxyj.2005.04.006
        摘要：This paper presented the multiplexing/mapping structure of digital wrapper based on ITU-T Recommendation G.709 firstly, then described in detail the block diagram of design of the subrate transparent multiplexer based on G.709, explained the advantages of the design, lastly, the BER-OSNR relation curve be showed and the FEC function be verified.  
          
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      • ZHU Fu-chun,MENG Xiang-yang,DING Guo-zhi
        Issue 4, Pages: 21-23(2005) DOI: 10.13756/j.gtxyj.2005.04.007
        摘要：The technologies of telecommunication network management are developing rapidly, and XML as a new interface technology begins to gain more attention. This paper introduces the features of main telecommunication network management interface technologies, proposes a integrated access Web network management model that uses the XML as network interface, and analyses the characteristics of this model.  
          
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      • LI Guang-yu,XIAO Ping-ping
        Issue 4, Pages: 24-26(2005) DOI: 10.13756/j.gtxyj.2005.04.008
        摘要：The resilient packet ring （RPR） is a new technology for high-speed backbone metropolitan area networks?A key performance objective of RPR is to simultaneously achieve high utilization, spatial reuse, and fairness?The core technical challenge for RPR is the design of a bandwidth allocation algorithm that dynamically achieves these three properties?In this paper,we introduce some problems in current fairness algorithm,and discuss a new dynamic bandwidth allocation algorithm called DVSR（Distributed Virtual-time Scheduling in Rings）.  
          
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      • KE Jun-Jie,MAO Qian
        Issue 4, Pages: 27-29(2005) DOI: 10.13756/j.gtxyj.2005.04.009
        摘要：This paper discussed the application of object-oriented mechanism in system management. Through setting up of data points information acquisition, resource sharing, structured information model, bus-type module communication mode and other technologies, it is possible to seek paths for decrease of network overhead, supporting various deployments dynamic management of system resources and increse of the system stability, it is also possible to allow the system to provide the network management personnel with more comprehensive knowledge and realize more optimized control.  
          
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      • LIU Chun-yan
        Issue 4, Pages: 30-32(2005) DOI: 10.13756/j.gtxyj.2005.04.010
        摘要：This paper described the position and role of FTTH system in the communication network, its network architecture and required functions. For the FTTH network architecture, we compared many different schemes and proposed that differend network schemes must be adopted according to the concrete application environments. These schemes include FTTB optical network, point-to-point fiber-division scheme, point-to-poin active optical network, IEEE-based EPON system and IUT-T-based GPON system.  
          
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      • HUANG Jun,HUANG De-xiu,WANG Tie-jun
        Issue 4, Pages: 33-35(2005) DOI: 10.13756/j.gtxyj.2005.04.011
        摘要：Dispersion of multi-clad fiber is solved with equivalent refractive index in this paper. First, the relation between the dispersion of the fiber and the propagation constant and equivalent refractive index is presented. Then, the dispersion of the multi-clad fiber is obtained by solving the propagation constant and the equivalent refractive index of single-clad fiber which is equal to multi-clad fiber. On this basis, the propagation constant is obtained by solving coupled equations with computer iteration, and dispersion of the multi-clad fiber is solved using curve mimesis and differential numerical method. Finally, as an example, the dispersion of triple-clad dispersion-flattened fiber is solved by this method.  
          
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      • LI Xin-he,TANG Yong-zheng,ZHANG Qi-li
        Issue 4, Pages: 36-38(2005) DOI: 10.13756/j.gtxyj.2005.04.012
        摘要：The most important aspect in the processing of optical fiber connector is the ultra-precision of endface of the ferrule. This paper discussed a new ultrasonic grinding processing, gave a simple analysis of the mechanism of the new lapping processing, and compared this new grinding processing with the conventional polishing processing. The results show that the grinding efficiency is raised by at least 48 times compared to that of processesing, average the surface roughness Ra of the fiber area is smaller than 3 nm, the corresponding average return losses is less than -60 dB and the average insertion losses is down 0.1 dB.  
          
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      • ZENG Zhi~1,YU Chong-xiu~1,LIU Lei~1,YU Jian-guo~2
        Issue 4, Pages: 39-41(2005) DOI: 10.13756/j.gtxyj.2005.04.013
        摘要：We compared feed forward and feedback as control mechanisms in adaptive polarization mode dispersion compensators（APMDC）; Different signals work as control input of APMDC, such as degree of polarization, spectral frequency component, eye-opening penalty, phase difference between frequency components on the orthogonal principal states of polarization, subcarrier tone added to data, are also analyzed and compared.  
          
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      • Shashi Kant,Harish Taneja,Sudipta Bhaumik,Abhay Arora
        Issue 4, Pages: 42-45(2005) DOI: 10.13756/j.gtxyj.2005.04.014
        摘要：Dense Wavelength Division Multiplexing （DWDM） emerges for increasing the network capacity for longer transmission distance, but its complication and expensive component restrict its cost effective uses in metropolitan networks. A newly developed low water peak single mode fiber has been designed to best suited for CWDM system. The newly developed fibers have low attenuation over wide range of operating bands including water peak at 1 3803 nm. Low water peak fiber with CWDM system can be used in about 33% more channel than conventional SMF in the same system. The fiber undergone robust environmental testing that enables its stability against hydrogen-induced attenuation, to ensure long-term reliability of field installed optical fiber cables. With its enhanced bend sensitivity make it compatible with recently deployed broadband access technology called Fiber to the Premises （FTTP）.  
          
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      • CHEN Xin-qiao~
        Issue 4, Pages: 46-49(2005) DOI: 10.13756/j.gtxyj.2005.04.015
        摘要：In this paper, we introduced the network design,the selection of devices, the installation and tested data of the CTYOP POF demonstration network, analyzed some problems of CYTOP POF and CYTOP POF Gigabit LAN, investigated the application prospect of the CYTOP Gigabit Ethernet. At last, we presented a suggestion to press on with the study of CYTOP in China.  
          
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      • LU Lin,WEI Yi-mei,WANG Rong
        Issue 4, Pages: 50-53(2005) DOI: 10.13756/j.gtxyj.2005.04.016
        摘要：The structure of FAMS（Fiber Automatis Mornitoring System） based on the concept of virtual instrument is proposed first. A FAMS scheme which uses embedded OTDR is discussed in detail in this paper.  
          
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      • LIU Wen~1,YANG Kun-tao~1,XU Yuan-zhong~2
        Issue 4, Pages: 54-56(2005) DOI: 10.13756/j.gtxyj.2005.04.017
        摘要：Optical fiber sensor is a newly developed technology. This paper presents, a distributed fiber temperature sensing system based on spontaneous Raman scattering, its applications and configuration design. The principal operation of the system pumped by a pulsed laser is analyzed emphatically. A new type of WDM based on the thin film filters used in Raman scattering is designed.  
          
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      • SONG Xue-peng,HUANG Yong-qing,REN Xiao-min
        Issue 4, Pages: 57-60(2005) DOI: 10.13756/j.gtxyj.2005.04.018
        摘要：The photonic crystal fiber （PCF） has a lot of peculiar features and broad prospects of application. At present, the PCF technology is developing quite rapidly, its potential applications are being unearthed continuously. this paper briefly analyzed the ligh-guiding mechanism of the photonic bandgap （PBG）-type PCF, described its typical structure, manufacturing processing and the formation mechanism of PBG, discussed its applications in optical communication.  
          
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      • LI You-mou,HAN Jun-gang
        Issue 4, Pages: 61-63(2005) DOI: 10.13756/j.gtxyj.2005.04.019
        摘要：The function verification of integrated circuits has become the bottleneck of the design cycle because of the increasing scale and the complexity of chips. In order to verify the design of ASIC chip in the field of SDH, this paper presents a primary verification platform, which includes various layers for specifying test benches and a library of standard data,as well as some C programs for comparing simulation dada with expected data. The platform has been use for verifying the design of 40 Gbit/s switch chip with satisfactory results.  
          
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      • YU Xian-lun~
        Issue 4, Pages: 64-67(2005) DOI: 10.13756/j.gtxyj.2005.04.020
        摘要：Many applications of solid-state Cr4+YAG laser require strict frequency stability. This paper, starting from the equations about the frequency characteristics of solid-state Cr4+YAG laser quantitatively analyzed the effect of variation of environmental temperature, atmosphere and humidity of laser work on the frequency fluctuation of the laser, proposed that the Pound-Drever system can be used to realize active frequency stabilization of Cr4+YAG laser.  
          
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      • Issue 4, Pages: 67(2005)
          
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      • YIN Ya-fang,FANG Qiang,LIU Yu
        Issue 4, Pages: 68-70(2005) DOI: 10.13756/j.gtxyj.2005.04.021
        摘要：The degree of polarization （DOP） is one of the physical quantities to describe fentures of light beam, its measurement is of great importance. In this paper, the principle and realization of DOP measurement using polarimetric method, scrambling method and extrema search method are analyzed in detail. The advantages and disadvantages of every methods are also given. The difference between two formulae for calculating DOP is discussed. And a DOP measurement scheme with high speed and accuracy applicable to polarization mode dispersion （PMD） compensation system is presented.  
          
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