最新刊期
      卷 ， 期 6 ， 1999
      • ZHANG Xu
        Issue 6, Pages: 1-4(1999) DOI: 10.13756/j.gtxyj.1999.06.001
        摘要：The paper begins with outlining the historical developments from frequency division to time division and then to wavelength division multiplexing systems. Then, it explains the fiber characteristics required by WDM systems and the fiber amplifier used together with WDM systems. Finally, it describes the applications of WDM systems on point-to-point transmission lines as well as in optical communication networking, indicating their bright prospects.  
        关键词：wavelength division multiplexing;fiber amplifier;transmission lines;communication network   
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      • MAO Qian
        Issue 6, Pages: 5-20(1999) DOI: 10.13756/j.gtxyj.1999.06.002
        摘要：We analyze the composition and layering structure of the synchronization network from the network view point, give the reference link of the clock transporting of the synchronization network, describe the rule on synchronization. It specifies the atomic function building blocks related with the network synchronization and timing,and how the SDH network elements take part in the synchronization of the network. It defines the atomic functions that are part of the two synchronization layers, the Synchronization Distribution （SD） layer and the Network Synchronization （NS） layer from atomic structure view point. It also defines some atomic function, part of the Transport layer, which are related with synchronization. We select the Synchronization Status Messages （SSM） Specifications suitable for applications in China based on the situations in our country.  
        关键词：SDH;synchronization;SSM   
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      • YANG Chun-hua
        Issue 6, Pages: 21-24(1999) DOI: 10.13756/j.gtxyj.1999.06.003
        摘要：ATM is orient-connect technology,realizing multicast/broadcast is important embodiment that ATM exchange is better than STM exchange, and is also hinge that whether ATM technology can apply at large in base of now networks. In shared buffer ATM exchange,realizating multicast is an item of emphases and difficulty. The article introduce a way to realize multicast communication in shared buffer ATM Exchange.  
        关键词：ATM;exchange;multicast;network;shared buffer   
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      • Issue 6, Pages: 25-29(1999) DOI: 10.13756/j.gtxyj.1999.06.004
        摘要：The gain response characteristics of a semiconductor optical amplifier （SOA） and their effects on the switching window of a terahertz optical asymmetric demultiplexer （TOAD） are studied by solving the gain dynamics equation of SOAs numerically.  
        关键词：semiconductor optical amplifier （SOA）;terahertz optical asymmetric demultiplexer （TOAD）;optical time division multiplexing （OTDM）   
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      • Issue 6, Pages: 30-34(1999) DOI: 10.13756/j.gtxyj.1999.06.005
        摘要：The principles of various kinds of all optical wavelength conversion as well as their advantages and shortcomings are discussed briefly in this article. And the Potential uses in optical communication are given also.  
        关键词：all optical wavelength conversion;WDM;OTDM   
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      • Issue 6, Pages: 35-40(1999) DOI: 10.13756/j.gtxyj.1999.06.006
        摘要：Clock synchronization is the precondition for digital equipment to work in harmoniously. To aim at synchronization problems of the widely used SDH self-healing rings, the paper gives a discussion, and puts forward a viewpoint. In the MS shared protection rings, if combining the message of APS to realize the functions of synchronization state byte S1, we should have a larger space to solve the synchronization problems.  
        关键词：synchronization of network;self-healing ring;timing loop;APS protocol;Protection switching   
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      • Issue 6, Pages: 41-43(1999) DOI: 10.13756/j.gtxyj.1999.06.007
        摘要：It is very important to make a test of lightning strike defense for optical fiber cables used in more lightning areas. This measurement aimed at WRI optical fiber cables is expatiated in this paper. The results of measurement indicate that WRI optical fiber cables have a favorable capacity of defense against lightning strike.  
        关键词：optical fiber cables;lightning strike defense   
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      • Issue 6, Pages: 44-46(1999) DOI: 10.13756/j.gtxyj.1999.06.008
        摘要：A high power 1. 31 um AlGaInAs/InP strained layer multiquantum well distributed feedback （SL MQW DFB LD） with RWG structure has been developed by MOCVD technique. The maximum output power of chip was larger than 50 mW at 25℃,thresthod currents （Ith ）were in the range of （1320） mA, the front facet slope efficiency （Es） was higher than o. 45 mW/mA. Side mode suppression ratio （SMSR）exceeded 35 dB, Median to time failure at room temperature was larger than 3×105hour.  
        关键词：AlGaInAs;strain multiquantum well;high power   
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      • Issue 6, Pages: 47-53(1999) DOI: 10.13756/j.gtxyj.1999.06.009
        摘要：This paper describes the principle、design and applications in WDM systems of arrayed-waveguide grating wavelength multiplexers, and the newest research results of them are introduced.  
        关键词：AWG;PLC;WDM   
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      • Issue 6, Pages: 54-59(1999) DOI: 10.13756/j.gtxyj.1999.06.010
        摘要：The authors report the operation of a harmonically and regeneratively modelocked erbium fiber ring laser at 1. 55um. Harmonic regenerative modelocking was achieved by feeding back the harmonic longitudinal beat signal which was detected with a high speed photodetector and a high Q dielectric filter. The laser keeps mode-locked status during 24 hours.  
        关键词：supermode noise;relaxation oscillation;modulation frequency;regenerative modelocking   
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