最新刊期
      卷 ， 期 1 ， 1990
      • Li Tianpei
        Issue 1, Pages: 1-10(1990) DOI: 10.13756/j.gtxyj.1990.01.001
        摘要：Future optical fiber telecommunication networks will require new types of semiconductor lasers. High speed single frequency lasers are needed for toll lines and local networks, while wavelength tunable lasers will be used for local oscillators in heterodyne receivers and wavelength switching in packet switches. This paper presents a brief review of the present status of these new semicondu■tor laser sources in the 1.3～1.55μm longwavelength region, with applications in the future broadband optical fiber transmission systems.  
          
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      • Pan Zhonghao
        Issue 1, Pages: 11-20(1990) DOI: 10.13756/j.gtxyj.1990.01.002
        摘要：This paper introduces the fundamental principle of the high density FDM fiber optic communications with coherent reception and key points for its realization. Briefing of initial experimental study on optical carriers is also given.  
          
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      • Ran Chongzhu Wang Dechao Wu Zhenying Wang Yuzhang
        Issue 1, Pages: 21-26(1990) DOI: 10.13756/j.gtxyj.1990.01.003
        摘要：This paper describes the improvements in quality of LPE wafers and in photo-electric cheracteristics of lasers by elaborate LPE and photoetching processes, with the lowest threshold current of 17 mA, single facet external differential quantum efficiency of 25%, maximum CW lasing temperature of 130℃, and the maximum output power of more than 40 mW. The reliability of lasers is enhanced by adopting PbSn welder and the modified manufacturing process. The lifetime of lasers is MTTF 25℃=2.6×105hours.  
          
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      • Guo Jianmin Tan Yuhua
        Issue 1, Pages: 27-41(1990) DOI: 10.13756/j.gtxyj.1990.01.004
        摘要：This paper deseribes the designing of op■ical fiber cable communication Project fo: Jiu jiang-Nan■ang s■tion built as the first ph■se of N an jing-Wuhan-Chongqing p■oject, which is China’s first long haul 140Mbit/s optical cable communication system.It also introduces the conf iguration and fanction of optical cable transmission syste■ and au■ilary systems, including line prot■tion s■i tching system, supe■visovy system, service sysiem and ■mote power feeding system.  
          
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      • Li Yong
        Issue 1, Pages: 42-49(1990) DOI: 10.13756/j.gtxyj.1990.01.005
        摘要：In this paper, analysis have been made on five kinds of supervisory transmitting methods for 5B6B code optical fiber communication systems. The impairment of main channel, due to using FDM method, is analyzed. The result of the experiment has Verified theoretical analysis.  
          
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      • Zhang Zhibing
        Issue 1, Pages: 50-56(1990) DOI: 10.13756/j.gtxyj.1990.01.006
        摘要：The compression coding of video conference signals is studied. A motion compensated interframe predictive coding scheme is presented, with which, the bit rate can be compressed to less than 2Mbit/s. The simulation shows that the quality of reconstructed picture at receiver side is good.  
          
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      • Xie Linzhen
        Issue 1, Pages: 57-59(1990) DOI: 10.13756/j.gtxyj.1990.01.007
        摘要：<正> 第十五届欧洲光通信会议于1989年9月10日～9月14日在瑞典Gothenburg市（哥德堡市）举行。会议由西欧电气工程师协会（EVREL）、美国光学学会（OSA）、日本电气工程师学会（IEEJ）等单位联合发起,由瑞典Chalmers理工大学具体组织。与会代表共计800人,宣读论文193篇。涉及到在光通信领域的各个方面（包括系统以及器件等各方面）的最新发展。兹分别介绍如下:  
          
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      • Issue 1, Pages: 60(1990) DOI: 10.13756/j.gtxyj.1990.01.008
        摘要：<正> 武汉邮电科学研究院在PCVD光纤熔炼系统的研制中取得了阶段性成果,制备出了低损耗单模光纤。研制的PCVD系统由熔炼车床、微波系统、流量柜、控制部分和真空部分等组成。微波源采用2 450MHz的连续波磁控管,最大功率为1.5kW,且连续可调。采用的原料为SiCl4、GeCl4、F-12和O2,其纯度与MCVD法时相同。石英管直径为20×2mm。一根预制棒可拉3 km左右光纤。  
          
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