最新刊期
      卷 ， 期 2 ， 1992
      • Zhang Xu
        Issue 2, Pages: 1-7(1992) DOI: 10.13756/j.gtxyj.1992.02.001
        摘要：The paper presents the technical considerations concerning the use of optical fiber in building the cable television broadcasting network . The problems under discussion include, radio TV vs.cable TV, analog TV vs. digital TV, multichannel video multiplexing, frequency modulation vs. amplitude modulatron imposed on subcarriers, lasers, optical amplifiers, power splitters used in distribution system,and interactive communication with video data base.  
        关键词：电视广播;有线(无线)电视;模拟(数字)电视;多频道复用;副载波多路复用   
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      • Issue 2, Pages: 2(1992)
          
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      • Issue 2, Pages: 7(1992) DOI: 10.13756/j.gtxyj.1992.02.002
        摘要：<正> 邮电部副部长谢高觉于1992年5月13日到武汉邮电科学研究院检查工作。随行人员有邮电部办公厅主任赵品健,通信司司长周长镛,基建司司长郑通扬、计划司副司长戴爽等。谢副部长一行听取了武汉院院长江廷林的汇报,重点视察了该院承担的京汉广140Mbit/s架空光缆光通信工程的设备、565Mbit/s光通信系统试验段设备,以及配合邮电通信设备整治而开发的多频、对端机等设备。谢副部长对武汉院近几年来面向通信建设的主战场,加速科技  
          
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      • Wang Duanxiang
        Issue 2, Pages: 8-20(1992) DOI: 10.13756/j.gtxyj.1992.02.003
        摘要：This paper describes the principle, structure and performance of two types of optical amplifier, i.e., travelling-wave semiconductor laser amplifier and Erbium-doped fiber amplifier, the application and problem of optical amplifier in optical fiber transmission system are also given. In addition, this paper analyses the signal-to-noise ratio for AM and FM format in TV transmission on optical fiber. Finally, the author pointed out that the trend in ultra-long distance fiber transmission is to employ optical fiber amplifier regenerator and wavelength - division multiple -xing.  
        关键词：光纤有线电视;半导体行波光放大器;掺铒光纤放大器   
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      • Li Linlin
        Issue 2, Pages: 21-26(1992) DOI: 10.13756/j.gtxyj.1992.02.004
        摘要：The quantum noise in optical heterodyne detection process is discussed. The effects of optical power in local oscillator on quantum noise are also discussed.  
        关键词：相干光通信;外差检测;量子噪声   
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      • Lu Weiping
        Issue 2, Pages: 27-34(1992) DOI: 10.13756/j.gtxyj.1992.02.005
        摘要：This paper introduces the principle of SB—APC—AB. The real-time implementation of the 16kbit/s SB—APC—AB speech compression coding and transmission system using high-speed DSP TMS320 C25 is described. Finally, the performance of the system is evaluated. The result indicates that the output speech quality is close to that of the 7 bit PCM.  
        关键词：语音压缩编码;子带编码（SBC）;自适应比特分配;自适应预测编码   
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      • Liu Rui Yin Yaping
        Issue 2, Pages: 35-45(1992) DOI: 10.13756/j.gtxyj.1992.02.006
        摘要：Based on the experimental result of modulation characteristics of lightwave devices, this paper analyses theoretically the intermodulation interference in high capacity SCM optical fiber communication system,it also presents some relevant formula, thereby provides theoretical basis for designing high capacity SCM optical fiber communication system.  
        关键词：光纤通信;副载波复用;互调失真干扰   
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      • Issue 2, Pages: 45(1992) DOI: 10.13756/j.gtxyj.1992.02.007
        摘要：<正> 邮电部科技司于1992年5月14日至17日在武汉邮电科学研究院召开会议,对京汉广架空光缆通信系统采用的四次群光电设备科研样机进行了鉴定。会议由邮电部科技司副司长赵墨林主持,邮电部副部长谢高觉及部相关司局长参加了开幕式。参加鉴定会的有国家科委成果办公室、邮电部有关司局、科研单位、高等院校、生产部门、使用部门等23个单位的专家和代表。与会专家和代表在鉴定委员会技术组和资料组的领导下,对设备进行了认真的测试和检查,对全套图纸和文字资料进行了认真的审查。专家们对该设备给予充分的肯定。  
          
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      • Ren Xingen
        Issue 2, Pages: 46-51(1992) DOI: 10.13756/j.gtxyj.1992.02.008
        摘要：Based on the fundamental theory of quantum amplifier, the phenomena of excited state absorption （ ESA ） in Erbium-Doped Fiber Amplifier （ EDFA ） is studied in this paper. The expression of the optimum Er3 + -doped fiber length pumped with 800nm LD is obtained where strong ESA exists. The calculated result using typical parameters of Er3 + -doped fiber is found to be in excellent agreement with the result of the experiment. Finally.a method of realising high-gain LD pumped EDFA is proposed.  
        关键词：掺铒光纤放大器;LD泵浦;激发态吸收   
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      • Tang Difang Gong Zhimin Yu Zunyong
        Issue 2, Pages: 52-61(1992) DOI: 10.13756/j.gtxyj.1992.02.009
        摘要：This paper gives the theory of optical frequency discriminator using optical fiber delay line, a design method is proposed for fiber delay line discriminator, finally a computer simulation is presented.  
        关键词：鉴频器;光纤延迟线;光纤延迟线鉴频器   
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      • Issue 2, Pages: 62(1992) DOI: 10.13756/j.gtxyj.1992.02.010
        摘要：京汉广架空光缆工程的建设是我国通信史上的大事,也是对国内光通信科研、设计、生产力量的全面检阅,深为人们所关注。本刊今年的第1期曾报道过“邮电部决定建设京汉广架空光缆工程”。这篇筒讯又进一步对该工程的概貌作了补充介绍。为了使广大读者了解该工程的进展情况,我们今后还将作跟踪报道。  
          
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