最新刊期
      卷 ， 期 2 ， 1998
      • Yuan Xinchang\ Li Guangcheng
        Issue 2, (1998)
        摘要：The 2 448 Mbit/s SDH multiplexing transmission equipment and repeating equipment developed by native is applied successly in high capacity optical cable transmission system fram Haikou to Sanya,and with some 155 Mbit/s multiplexing equipments.This paper introduces the construction and characteristic of this system.  
        关键词：optical communication;SDH;transmission system   
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      • Yin yanfen
        Issue 2, (1998)
        摘要：The timing jitter induced by pointer adjustments represents a technical problem in SDH based network.Because of the characteristics of its large amplitude and low frequency,the result of reducing jitter is unsatisfied using usual way. A new method of pointer spreading——double period leaking and modulating desynchronizer is proposed in this paper.The effect on reducing jitter is obvious and its curcuit is simple.  
        关键词：modulation;double period leaking;jitter   
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      • Lin Xiao
        Issue 2, (1998)
        摘要：In this paper,we introduce a new way on distribution of information flow in uplink multiplex systems with TDMA, and by discussion we present a relative optimal algrithm on distrbution of flow.Furthermore,this algrithm is also fit for the ATM problem on distribution of band width which is needing resolution.  
        关键词：access network （AN）;passive optical network （PON）;services array;algrithm;calculation complexity   
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      • Yu Jianjun\ Yang Bojun\ Guan Kejian
        Issue 2, (1998)
        摘要：A fiber ring laser with tuable wavelength and repetitive frequency is successfully made.The optical pulse with different wavelength transmitting in the fiber chain composed of normal and abnormal dispersion fiber waw researched experimentally and numerically.The results show that with the same initial condition,nonlinear optical pulse transmission in average normal fiber is superior to soliton transmission in short distance.However,soliton transmission is superior to nonlinear optical pulse in long distance.There exists an optimum wavelength with the optical fiber chain composed of normal and abnormal dispersion fibers in long distance transmission.  
        关键词：dispersion allocation;\ soliton transmission;\ tunable wavelength   
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      • Yang Zhenzhong
        Issue 2, (1998)
        摘要：The subscriber line cross connect system（LXM） is high rate digital multichannel cross connect system,as a narrow band service platform,the subscriber may connect to switching system using it.It is useful for FTTH,this paper describes the application and technology concept of LXM.  
        关键词：fiber optical communication;\ access nctwork;\ cross connect system   
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      • Huang Hongtao
        Issue 2, (1998)
        摘要：The voltage frequency converters are ideally suited for use in simple lowcost circuits for analog to digital conversion.We completed the analog optical fiber tansmission line\ experiment using the PIN FET integrated optical clectronics receiver and analog integrated circuit,and achiecved 100 kHz frequency convertion and excellent accuracy as 0.1%.  
        关键词：VFC;\ FVC;\ analog signal;\ transmission accuracy   
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      • Zou Linsen
        Issue 2, (1998)
        摘要：A new cable structure is reported in the paper.It is central tube type optical fiber cable with coil bore hole.Calculation of optical fiber exceed longth in cable is introduced.  
        关键词：central tube type fiber cable;coil bore hole;optical fiber exceed longth   
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      • Huang Liqun\ Jian Wei\ Zhang Jie\ Jiang Zhongao Jian Shuisheng
        Issue 2, (1998)
        摘要：The mechanical performances of various overhead optical cables are analyzed in various meteorological and aerical conditions.The cross section areas of overhead optical cable reinforcing materical are calculated for a big span.The results are significant for the design and manufacture of self supportiong overhead optical cables.  
        关键词：self supporting overhead optical cable;\ big span;\ meteorological condition;\ mechanical calculation   
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      • Jian Wei\ Zhang Jie\ Huang Liqun\ Jiang Zhongao
        Issue 2, (1998)
        摘要：This paper discusses structure and character of a new type of non metal armoured optical cable,experimental data indicates that the cable has better performance and lower price.  
        关键词：big core diameter;\ loose tube;\ non metal armour   
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      • Xiao Xiaoming\ Wang Yunchen\ Liao Yanbing\ Le Ping
        Issue 2, (1998)
        摘要：In connection with the problem of the induced loss due to hydrogen diffusion which has been disturbing people in optical cable field,the paper discribes the method of testing the induced loss due to hydrogen diffusion by analysing some typical examples.The main source of the inducced loss due to hydrogen diffusion is explored in this paper.Especially,the paper introduces how to avoid the induced loss due to hydrogen diffusion and how to make the cable with the induced loss due to hydrogen diffusion return to normal.  
        关键词：optical cable;\ loss due to hydrogen diffusion;\ optical loss   
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      • Zhang Zhemin Jin Jinyan\ Huang Gefan\ Li Tongning\ Huang Dexiu
        Issue 2, (1998)
        摘要：The dual polarization dual wavelength lasers with active layer of mixed strained layer quantum well are reported in this paper. These lasers are compared with lasers with bulk active layer, lattice matched quantum well active layer, and compressively strained quantum well active layer.These lasers can operate with both TE and TM polarization lasing at the same time, and the two polarization modes have different lasing wavelengths. Combining other people’s experimental results, it is concluded that in the mixed strained layer quantum well structure, we can’t determine the band filling effect in the two kinds of strained layer quantum wells from the peak wavelength difference of the two polarized spontaneous emission spectra.  
        关键词：Semiconductor laser;\ strained layer quantum well;\ polarization   
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      • Zhang Jinsong\ Zhao Yucheng\ Xie zenghua et al
        Issue 2, (1998)
        摘要：Condition for single mode operation of DBR fibre laser is given based on rate equations theory.We apply it to the design by analyzing characteristics of grating reflectivity and some approximation.It provides theoretical guidance for real fabrication.  
        关键词：rate equations;\ distributed Bragg reflection （DBR）;\ fibre lasers   
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      • Wang Wenxiao
        Issue 2, (1998)
        摘要：The series of FLEX10K device are used widely because of its rich resource and its being used more easily,in this paper the key technique and own experiences are given to quicken application.  
        关键词：logic array;\ FPGA;\ embeded programmable logic device   
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      • Issue 2, (1998)
        摘要：实现高速光纤通信的方案有多种：电时分复用（ＥＴＤＭ）、波分复用（ＷＤＭ）、光时分复用（ＯＴＤＭ）、光孤子传输以及它们的组合等。由于ＥＤＦＡ（掺铒光纤放大器）本身具有Ｔｂｉｔ／ｓ级信号的处理能力，因此，以ＥＤＦＡ为代表的光放大技术的研制成功和应用，使这些技术方案将显示出更加美好的前景。  
        关键词：光纤通信;波分复用;光时分复用   
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      • Issue 2, (1998)
        摘要：多模光纤获得更多局域网的市场份额闫长（长飞光纤光缆有限公司４３００７３）在企业网、智能化办公大楼及高速计算机网络中越来越多地使用了光纤。尽管铜缆目前仍然最为常用，但越来越多的网络在规划时已考虑到使用光纤。信息高速公路、因特网接入、连机用户增加及多媒...  
          
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      • Issue 2, (1998)
        摘要：对“关于ＡＤＳＳ光缆强度和架设垂度的计算”补充（武汉邮电科学研究院邹林森）在《光通信研究》１９９８年第１期ＰＰ２９～３２刊登了“关于ＡＤＳＳ光缆强度和架设垂度的计算”。该文中公式的推得，是假定ＡＤＳＳ架设在等高的铁塔上，并将附加荷重（如冰、风力作用）...  
          
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