最新刊期
      卷 ， 期 4 ， 1998
      • Mao\ Qian
        Issue 4, (1998)
        摘要：This paper describes the production and it’s determination for sub STM 0 rate and about the interface standards.  
        关键词：SDH;\ Sub STM 0 rate;\ interface   
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      • Yang Zhu
        Issue 4, (1998)
        摘要：This paper describes the 10 Gbit/s system transmission test in 478.8 km G.655 fiber at the first time of our coumtry.The test used 5 EDFAs without dispersion compensation method,at the last the dispersion cost is 0.1 dB and the PMD has no effet on system.  
        关键词：optical fiber transmission;\ system test;\ EDFA   
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      • Yin Yanfen
        Issue 4, (1998)
        摘要：This paper introduces a kind of way which can reduce the timing jitter induced by bit justification--adaptive threshold modulation.The theoretical analysis and digital implementation are developed.The comparison between stuff threshold modulation and adaptive threshold modulation proves that the later is better.  
        关键词：threshold modulation;\ jitter;\ frequency shift   
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      • Li Qungao
        Issue 4, (1998)
        摘要：This thesis focused on SDH communication network protections.When some failures occur,some routes must be searched to build enough paths for restoration.At the same time,in building a communication network,we will spend the least spare resouce to satisfy the protection demand.The first step to solve this problem is presenting a mathematic model for it.It is also the most difficult and important step.When a mathematic model is built,the problem can be solve by mathematic algorithm.  
        关键词：network;\ spare capacity;\ optimal planning;\ mathematic model   
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      • Song Lijun\ Huang Chao\ Li Shichen
        Issue 4, (1998)
        摘要：The concepts of wavelength division multiplexed all optical fiber networks （WDM AONs）,the topology,wavelength routing,optical cross （OXC） and the future trend of WDM AONs are analyzed in this paper.  
        关键词：WDM;\ WDM AONs;\ OXC   
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      • Qiou Wenhua
        Issue 4, (1998)
        摘要：This paper discusses the destination,position and function of the port control in ATM switching fabric,and gives a design algorithem based on searching tree data structure,which can be used in large scale public communication network.  
        关键词：ATM;policing;searching\ tree   
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      • Tang Renjie\ Cao Meie
        Issue 4, (1998)
        摘要：As the rapid development of optical fiber communication, the demand on silica based single mode fiber （SMF） is increasing dramatically. The productivity of SMF is restricted by several factors with traditional MCVD process. This paper gives a brief analysis about these factors at first, and then, reviews the new technologies to overcome them, including using synthetic silica tube, various hybrid processes and new heating technologies to substitute for H 2 O 2 flame .Finally, suggestions about the development of optical fiber fabrication in China are presented.  
        关键词：single mode fiber;\ MCVD;\ synthetic silica tube;\ hybrid process;\ new heating\ technologies   
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      • Chen Minna\ Song Chuanying\ Li Yanjie\ et.al
        Issue 4, (1998)
        摘要：This paper describes the usage and principle of GZSH 01 absorbent thixotropic gel for optical cable. The paper also introduces the formula of GZSH-01 absorbent thixotropic gel for optical cable, the effect of absorbent thixotropicgel’s formula and technology on its properties ,and the test results of batch product of GZSH-01 absorbent thixotropic gel for optical cable.  
        关键词：absorbent thixtropic gel;\ flooding;\ additive   
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      • Peng Hongling\ Fu Yanfeng\ Liu Bo\ et al
        Issue 4, (1998)
        摘要：Acousto optic tunable filter （AOTF） is the main device to provide wavelength routing in the future’s all optical network. It has special multi channel operation function and can simultaneously select multi-wavelength and tuning quickly. To implement the selective function of tuning wavelength , AOTF requires high qulity RF power resources . This article introduces a type of RF power source that can implement tuning and multi channel operation simultaneously. In our circuit, SAW resonator is used to make out the oscillator. The oscillator has enough frequency tuning range and enough stability. Its instant stable degree can reach 10 -8 . The single channel’s output power can reach 1W that meets the needs of the AOTF’s operation.  
        关键词：AOTF;surface acoustic wave resonator;\ driving power source   
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      • Wei Daoping\ Zhao Yucheng\ Zhang Jinsong\ et.al
        Issue 4, (1998)
        摘要：The asymmetrical fused taper couplers have been studied theoretically in this paper,theoretical analysis reveals that this kind of couplers have wavelength flattened characteristics,and this result agree with the experimental data.  
        关键词：optical fiber couplers;optical passive devices;fused taper optical couplers   
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      • Li Fang\ \ Li Ling
        Issue 4, (1998)
        摘要：Erbium doped fiber amplifier （EDFA）, in conjunction with wavelength division multiplexing （WDM） techniques,has been the dominated direction to improving the capacity of high speed optical communication in recent years.In this paper, we introduce and analyze several kinds of effect method to achieve gain flattened EDFA for WDM applications,which provides reference for the applied research of EDFA for WDM applications.  
        关键词：WDM;\ EDFA;\ gain flattened   
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      • Zhang Zhemin\ Huang Dexiu
        Issue 4, (1998)
        摘要：The polarization dependent optical confinement factor of waveguide structure with mixed strained layer multi quantum well has been discussed in this paper. Since the barrier width is relative small, its variation doesn’t affect the optical confinement very much. If the refractive index of layers are fixed, the optimal widths of waveguiding layer （with the largest confinement factor） are the same for symmetry and unsymmetry waveguide structures. And near the optimal width, Γ TM /Γ TE is sensitive to waveguiding layer width. This can be used to design polarization insensitive semiconductor laser amplifiers.By adjusting the waveguiding layer width, we can change the ratio of gain between TM and TE modes.  
        关键词：quantum well;\ optical confinement factor;\ optoelectronic devices   
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      • Wu Yousheng et al
        Issue 4, (1998)
        摘要：This paper presents the 2.5 Gbit/s transmitter module（TM） that the authors have designed and experimentalized. In the paper,the working principle, key technology, typical characteristics parameters of the module are given. The module has stabilized the center wavelength of laser diode by controling its temperature. It has supplied the light source with the characteristic of stable center wavelength for wavelength devision multiplexing system application.  
        关键词：transmitter module（TM）;laser diode（LD）;wavelength devision multiplexing （WDM）   
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      • Wang Wnxiao
        Issue 4, (1998)
        摘要：the PLD are widely used because they can be used easily,in this paper presents how to select the devices and quicken application, and our experince are given.  
        关键词：logic array;\ CPLD;\ ASIC   
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