最新刊期
      卷 ， 期 1 ， 1988
      • Xie Yutang
        Issue 1, Pages: 1-9(1988) DOI: 10.13756/j.gtxyj.1988.01.001
        摘要：This paper briefly describes the overall configuration and performance targets of the optical fiber cable experimental project between Hankou and Jingzhou, Its main targets are: 1. in complete conformity with the related recommendations of CCITT; 2.with channels for inter-regional communications; 3. with perfect automatic supervisory system, nonmanned repeater stations; 4. order and supervisory information transmitted through optical path without additional copper wire.  
          
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      • Issue 1, Pages: 10-15(1988) DOI: 10.13756/j.gtxyj.1988.01.002
        摘要：A new high precision optical aligning system is described; analysis and calculations are made theoretically on its practicability design philosophy and experimental results are presented; its application in machining sing（?）emode connectors is also discussed.  
          
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      • Pu Guosheng,Liao Chengen
        Issue 1, Pages: 16-22(1988) DOI: 10.13756/j.gtxyj.1988.01.003
        摘要：It is shown that the dispersion curves of composite dielectric wavegudes with two different ellipt ic-cylinder boundaries are computable by using the second-order f in ite - e lenient method. In this paper, a finite element program is written.The results of calculations are compared with that of previous approximate calculations.  
          
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      • Zhao Liyun
        Issue 1, Pages: 23-31(1988) DOI: 10.13756/j.gtxyj.1988.01.004
        摘要：This paper describes a high speed pseudorandom code generator developed by using China-made ECL devices. Theoretical analysis is made on such pseudo-random code generator, measures are suggested for increasing transmission bit rate, circuits of seven-order and twentythree-order for such generator are also presented.  
          
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      • Ding Guoqing
        Issue 1, Pages: 32-40(1988) DOI: 10.13756/j.gtxyj.1988.01.005
        摘要：Two large area （φ1.6mm） Ge photo-detectors with a groove-mesa structure have been-fabricated adopting Sb-doped N typegermanium crystal with resistivities of 0.35Ω-cm and 6Ω-cm as the substrate material, using ion-implantations of B+ or Be+ for forming a p+ region. The measured photoelectric characteristics indicate that, the spectral response does not depend on the sort of implanted ions and material resistivity when these Ge-PDs are applied at a bias voltage of nearly zero volt, but I-V characteristics and light response （Re） depend on material resistivity, junction depth and the sort of implanted ions.  
          
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      • Yang Zhuang
        Issue 1, Pages: 41-48(1988) DOI: 10.13756/j.gtxyj.1988.01.006
        摘要：Longitudinal-mode fluctuation characteristics of nearly single-longitudinal-mode semiconductor laser is investigated theoretically and experimentally. Statistical characteristics of longitudinal - mode intensity fluctuation of the laser is derived by a simple model, and corresponding experiments are made. The two results are in good agreement.  
          
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