最新刊期
      卷 ， 期 3 ， 1994
      • Zhang Xu
        Issue 3, (1994)
        摘要：The paper suggests some critical problems which must be carefully considered in the preliminary stage of planning the development of″Information Superhigh way″in China.These problems include:the formation of telecommunication networks, the build-up of information industries, the experience obtained in the execution of reform and opening policy for telecommunications, the transition of the technology research accomplish ments to commercial productive force, and the policy-making and legislation for telecom munication construction in China. The essentials of these problems are briefly described.  
          
        2
        |
        38
        |
        2
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502831 false
        发布时间：
      • Li Ping,Tang Qunhui,Xu Xiouzuo
        Issue 3, (1994)
        摘要：In this paper,we report a multi-gradient layers （three or more） InGaAs （P）/InP avalanche photodiode with the middle bandgap transition between seperated absorp tion and multiplication regions, which has beed successfully developed by using liquid phase epitaxy growth and traditional photoetching fabrication technique （referred to as InGaAs （P）/InP SAGM）. The obtained test results are: breakdown voltage VB=40～90V,dark cur rent Idmin（0.9 VB）<10nA, responsivity （1.3μm）Re=0.6～0.8A/W, multiplication factor M ≥20（Mmax>40）,excess noise factor F=5, and wide band frequency response.  
          
        2
        |
        86
        |
        3
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502820 false
        发布时间：
      • Wu Zhenying,Hu Chongyan,Wu Tong,Le Rongping,Liu Zheli
        Issue 3, (1994)
        摘要：InGaAsP/InP ridge waveguide （RWG） lasers at 1.3μm have been successful ly developed using five-layer structure crystal material made by one step LPE technology and the self-alignment process. By the upside of active area mounting method,the smallest threshold.current of lasers（CM）is 23mA at 25℃ ambient and shows good uniformity on this parameter;the highest opto-electric tramsfer efficiency from single facet is 0.18mW/mA;the highest output power at 65℃ambient temperature is more tham 10mW;the coupled power into the standard single mode fiber is more than 1.5mW at threshold current plus 20 mA and 25℃ambient temperature.  
          
        2
        |
        66
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502809 false
        发布时间：
      • Zhang Xiaoguang,Guo Wanwen,Zhang Lan
        Issue 3, (1994)
        摘要：A kind of finite difference method is obtained with numerical solution of mod ified nonlinear Schrodinger equation （MNLS eq）. Using this method,the computer simula tions for the experiment concerned of optical soliton telecommunication. Some aspects of de sign scheme for the experiment,has also been discussed.  
          
        2
        |
        75
        |
        4
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502754 false
        发布时间：
      • Liu Shuihua,Xu Yuanzhong,Fang Luozhen
        Issue 3, (1994)
        摘要：The compact fabry-perot type tunable optical filters with single mode fiber pigtailed GRIN lens at 1. 5μm or 1. 31μm band have been developed. The devices preserve high performance over a wide free spectral range. In this paper,we first introduce the opera tion principle,structure and key factors for fabrication. The measured results by the method of spectral analysis are also given.  
          
        2
        |
        107
        |
        4
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502838 false
        发布时间：
      • Jiang Shan,Liu Shuihua,Fang Luozhen,Xu Yuanzhong
        Issue 3, (1994)
        摘要：In this. paper,a kind of high return loss single mode fiber joint with bevelled endface is reported. The characteristics of its return loss is analyzde by Gaussian beam cou pling theory. The results of experimental measurements .show that the insertion loss is less than 0.6dB,and the return loss is better than 53dB, The theoretical study indicated single mode optical fiber bevelled joint is an effective way in developing passive devices with high return loss.  
          
        2
        |
        369
        |
        24
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502743 false
        发布时间：
      • Wu Zhongjun
        Issue 3, (1994)
        摘要：This paper introduces the field application of FMS-1 fixed optical fiber connectors to tour single mode optical cable lines 154 have been used, the average connecting loss is 0.125dB and the average joint loss for each optical fiber line is 0.15dB. The longest connected line is 33km. The return loss of all applied connectors from Qingyang to Ji uhuashan has been measured and results show that it is more than 38dB.  
          
        2
        |
        50
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502789 false
        发布时间：
      • Issue 3, (1994)
        摘要：光纤连接器产生反射的原因及其避免措施据美刊《光波》１９９４年４月的一篇载文报道，当两个插配连接器的光纤纤芯彼此不能实现物理接触时，反射便随之产生而大大降低各光纤系统性能，使数据信号不能达到高效率与远距离传送。实验研究发现，光纤端面抛光应力不当、连接器...  
          
        2
        |
        49
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502828 false
        发布时间：
      • Jin Zhengwang
        Issue 3, (1994)
        摘要：This paper describes the relation between characteristics （insertion loss and return loss） of optical fiber connectors and the shape structure of the ferrule endface and pol ishing technology. The design requirements of the shape structure of the ferrule endface are discussed. The test results of several different shapes of the ferrule end face and polishingtechnology are given.  
          
        6
        |
        175
        |
        8
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502762 false
        发布时间：
      • Liu Zeheng
        Issue 3, (1994)
        摘要：The paper reports the elongation test of Fiber-bundle central tube cable of with longitudinally wraped steel tape and its rexult. It also descusses the elongation proper ties, attenuation characteristics, definition of the elongation force and redundancy of the op tical fiber.  
          
        2
        |
        54
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502770 false
        发布时间：
      • Wei Zhongcheng,Cao Meie,Shi Qing,Tang Renjie
        Issue 3, (1994)
        摘要：Gel-derived silica tubes are synthetized at low temperature through the col loid-sol process.This technique has been proved to be effective in preventing the gel cracking and shortening the period of the process. Under a proper sintering, the complete densified and transparent silica tubes can be obtained.  
          
        2
        |
        55
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502779 false
        发布时间：
      • Yan Yuelin,Tang Qin,Xiong Xenwei
        Issue 3, (1994)
        摘要：The theoritical and experimental study on the strain of loose-tube stranding optical cable has been done.The experimental instruments and samples are introduced.The experimental results show that fibers are not in tension when the strain of the cable is smaller than the fiber extra length,and the strain curve of cable is approximately linear.The variation of optical power in fibers and the strain approach zero when the cable sample is in the long term tension. The biggest variation of optical power in fibers is 0.023dB and the biggest fiber strain is 0.012% during the short term tension.  
          
        2
        |
        71
        |
        2
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502801 false
        发布时间：
      • Issue 3, (1994)
        摘要：光缆应变的分析王宏伟（西古光纤光缆有限公司技术部）１引言现行光缆应变的测试方法主要有两种：一种是测量拉伸试验设备中可动导轮的位移，另一种是在光缆受拉段上作标记（ｌｍ），并测试拉伸时该段的伸长。这两种方法本质是一样的。但运用上述两方法，却发现光缆应变的...  
          
        2
        |
        54
        |
        2
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502797 false
        发布时间：
      • Issue 3, (1994)
        摘要：简讯日本将开发高速电信网络日本政府及工业界对在建立全国性电信网络方面，日本可能会落后于美国表示忧虑。如今，华盛顿方面正在加速建设信息高速公路，而日本计算机和电信工业界担心美国的公司将得到所有的主要专利。因此，日本政府将帮助成立一个公司，以开发高速数字...  
          
        2
        |
        13
        |
        0
        <HTML>
        <Meta-XML>
        <引用本文> <批量引用> 27502777 false
        发布时间：
      0