最新刊期
      卷 ， 期 4 ， 2003
      • Issue 4, Pages: 1-2(2003) DOI: 10.13756/j.gtxyj.2003.04.001
        摘要：The paper briefly describes the vertical--cavity surface--emitting lasers （VCSEL）operated at three wavelengths （0. 85, 1. 3, 1. 55 μm） for optical communication systems.  
        关键词：optical fiber communication;laser;VCSEL   
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      • Issue 4, Pages: 3-5(2003) DOI: 10.13756/j.gtxyj.2003.04.002
        摘要：In this paper, super FEC technology is introduced first, by the use of super FECtechnology, we demonstrated 40×10 Gbit/s unrepeatered and error--free transmission over160 km of G. 655 fiber with 44 dB loss, and the transmission performance are better thanthe requirements of China communications standards.  
        关键词：WDM;super FEC;OSNR;G.655 fiber;coding gain   
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      • Issue 4, Pages: 6-9(2003) DOI: 10.13756/j.gtxyj.2003.04.003
        摘要：The routing technology is key technology of ASON. Based on the analysis of thearchitecture of layer network and routing,this paper has a detailed discussion about the hi-erarchical routing of ASON.  
        关键词：ASON;layer network;subnetwork division;hierarchical routing;routing area   
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      • Issue 4, Pages: 10-12(2003) DOI: 10.13756/j.gtxyj.2003.04.004
        摘要：The concept of multi--dimensional optical codes are expatiated, and their perfor-mance is analysed. Prime codes, two-dimensional optical orthogonal codes, two-dimen-sional prime codes and three-dimensional optical orthogonal codes are introduced emphati-cally.  
        关键词：OCDMA;multi-dimensional codes;encoder/decoder;large capacity   
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      • Issue 4, Pages: 13-17(2003) DOI: 10.13756/j.gtxyj.2003.04.005
        摘要：In the paper a more suitable SDH system with the new method of overhead pro-cessing is discussed,which results in fast upgrade. It has been realized and the hardwarehas been testified.  
        关键词：SDH;overhead processing;frame   
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      • Issue 4, Pages: 18-21(2003) DOI: 10.13756/j.gtxyj.2003.04.006
        摘要：Because of the phase noise fluctuation at the output of a semiconductor laser,the transimited optical signal experiencing multiple reflections from fiber interface will becoherently superposed with a delayed version of itself. This can produce intensity noisefluctuation due to phasc--to--intensity conversion. The effects of Interferometric noise onthe EFM optic-links must be considered due to the high data rate. In this paper, we ana-lyze the effects of interferometric noisc on the system performance and its power penalty.  
        关键词：EFM;interfcrometric noise;power penalty   
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      • Issue 4, Pages: 22-24(2003) DOI: 10.13756/j.gtxyj.2003.04.007
        摘要：The principle and operation mechanism of GMPLS is firstly analyzed. A GM-PLS--based control plane software suite is then designed for a novel kind of node model-op-tical router. The GMPLS--based control plane software architecture can implement unifiedtraffic cngineering and joint multi--layer protection/restoration techniques that help to im-prove the network throughput and resource utilization.  
        关键词：GMPLS;unified control plane;routing;signaling.   
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      • Issue 4, Pages: 25-28(2003) DOI: 10.13756/j.gtxyj.2003.04.008
        摘要：PON （Passive Optical Network） shares fiber at the ONUs. This can greatly decrease the cost of PON. But this also results in fragility of the network. If security of PONcan be assured, it can be more practical. This article analyzes in detail the reason of thefragility and offers some solutions. At the end of this article, the feasibility of the solu-tions is confirmed by simulation experiment.  
        关键词：PON;encipher;decipher;buffer;churning   
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      • Issue 4, Pages: 29-32(2003) DOI: 10.13756/j.gtxyj.2003.04.009
        摘要：The two standout features of MAN are full services and public network. Withthe common services in MAN, this paper analyses two development trends in the WDMmulti services transport platform: Coarse WDM and ION（Intelligent Optical Network）.  
        关键词：optic MAN;CWDM;ION   
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      • Issue 4, Pages: 33-36(2003) DOI: 10.13756/j.gtxyj.2003.04.010
        摘要：The paper firstly analyzes the development status and limitation of UniCom’sprovincial transmission backbone network. Then, after briefly introducing DWDM advan-tages, it presents and describes designing solutions for upgrading existing network byDWDM technology. Finally, in terms of optimization of UniCom’s network resource, rea-sonable configuration and network security, its advantages and development direction arediscussed in this paper.  
        关键词：DWDM;networking seheme;network resource optimization;network security   
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      • Issue 4, Pages: 37-41(2003) DOI: 10.13756/j.gtxyj.2003.04.011
        摘要：In order to break the electronic processing bottleneck of current routers andswitches, Internet will certainly evolve into a WDM--based all--optical network. The opticalrouter will play key roles in the future optical Internet, so it is necessary to research anddevelop the optical router. In this paper, we propose a architecture of optical router,which is based on labeled optical burst switching mechanism. The proposed architecturecan provide all--optical edge--to--edge data routing and transport services without o--e/e--oconversions. The paper has studied and analyzed some key issues in implementation includ-ing the burst data format and assembly, the extraction and recognition of burst header,optical routing and label switching, and congestion. Moreover we put forward some feasi-ble solutions to the issues, designed an experimental system and gave the relevant experi-ment results.  
        关键词：IP router;optical label;optical burst switching;WDM   
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      • Issue 4, Pages: 42-44(2003) DOI: 10.13756/j.gtxyj.2003.04.012
        摘要：This paper introduces the IN/Internet interworking service types,the interwork-ing architecture, the related function entities and the communication protocols. Besides,anexample of one service implementation（ICW） is given in illustration of the service imple-mentation process.  
        关键词：IN;Internet;gateway   
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      • Issue 4, Pages: 45-47(2003) DOI: 10.13756/j.gtxyj.2003.04.013
        摘要：With the development of the optical transmission network and the enlargement ofthe Internet,maintenance workers are required to improve their skills continously. Besidesproviding high--quality service to consumers,how to make correct judgement about break-downs and cope with them immediately is the key to win customers’ trust and dominate themarket.  
        关键词：optical transmission equipment;causes of breakdown;fixing process   
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      • Issue 4, Pages: 48-50(2003) DOI: 10.13756/j.gtxyj.2003.04.014
        摘要：This paper discusses many factors which increase the attenuation of multi--modefiber（MMF） and methods to reduce the attenuation. We find that these methods can suc-cessfully reduce the attenuation of multi--mode fiber.  
        关键词：MMF;PCVD;attenuation;intrinsic absorption;Rayleigh scattering   
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      • Issue 4, Pages: 51-54(2003) DOI: 10.13756/j.gtxyj.2003.04.015
        摘要：The construction characteristics, water absorbability and waterproof mechanismof waterblocking tape used in optical fiber cable are introduced briefly at first. On thesetheory basises, we propose a convenient and effective method--viscosity test to evaluatethe core substance of the waterblocking tape--superabsorbent polymer’s （SAP） hydrogelintensity and heat stability with full consideration of optical fiber cable’s practical usage.The contrast experimental results indicate this method has practical value for the wa-terblocking tape’s quality control.  
        关键词：superabsorbent polymer （SAP）;hydrogel intensity;heat stablity;viscosity   
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      • Issue 4, Pages: 55-57(2003) DOI: 10.13756/j.gtxyj.2003.04.016
        摘要：This paper proposed an integrated semiconductor device based on SOI. A 5 μm×5 μm single mode waveguide was designed and its optical field was simulated with APSSsoftware. Strait rib waveguide, Y--branch and V--grove were made by KOH wet chemicaletching. Fiber was coupled with wavguide through UV--glue at last.  
        关键词：SOI;optical waveguide;Y-branch;V-groove   
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      • Issue 4, Pages: 58-60(2003) DOI: 10.13756/j.gtxyj.2003.04.017
        摘要：This paper introduces the concept of discrete Raman fiber amplifier（RFA）,someexperiment and analysis results about the amplifier are also presented.  
        关键词：discrete RFA;distribute RFA;high non-linear fiber   
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      • Issue 4, Pages: 61-63(2003) DOI: 10.13756/j.gtxyj.2003.04.018
        摘要：The flatness of distributed Raman amplifier’s （DRA） gain profile is a key parame-ter. This paper verified the great influence of pumping configuration and signals power ongain profile by experiment. The WDM signals of 20 channels （ranging from 1 537. 377 to1 560. 605 nm） on the ITU-T grid were used as the incident signals of DRA. Each channelwas modu1ated externally by a electro--absorption （EA） modulator using a 2. 5 Gbit/s non-return--to zero （NRZ） format, with a 27 -- 1 long pseudo-random bit sequence （PRBS） sig-nal. The experimental results have referential value for optimizing the flatness of DRA.  
        关键词：distributed Raman amplifier;erbium doped fiber amplifier;dense wavelength division multiplexing   
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      • Issue 4, Pages: 64-66(2003) DOI: 10.13756/j.gtxyj.2003.04.019
        摘要：This paper reported new coherent optical pulse resource which is 10 GHz passiveexternal cavity mode--locked pulse laser diode used in the ultrahigh speed optical communi-cation. Its pulsewidth is 2. 9 ps, wavelength tuning range is 1. 53～1. 57 μm（40 nm）,preci-sive output wavelength is 1. 55 μm, repeat frequency is 10 GHz, average output power is1 mW, and time jitter is low（<0. 6 ps）.  
        关键词：OTDM;MLLD;fibre-optic communication;MQW-LD   
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      • Issue 4, Pages: 67-70(2003) DOI: 10.13756/j.gtxyj.2003.04.020
        摘要：The main electro--optic modulators in the high speed long distance optical fibercommunication are introduced, their principle, construction and application are described.The researches in semiconductor modulator are making great progress. The organic poly-mer electro--optic modulator is considered as the most potential modulator in the high speedoptical fiber communication, and is being the focus of people’s attention.  
        关键词：Mach-Zehnder interfermeter electro-optic modulator;Fabry-Perrot electro-optic modulator;directional coupling electro-optic modulator;Silicon-based electro-optic modulator;organic polymer electro-optic modulator   
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