最新刊期
卷 ， 期 4 ， 1999
- 摘要：In SDH system desynchronizer, the bit leaking and PLL circuit is the key technical problem in the design. This paper describes a example of the desynchronous circuit which based on adaptive bit leaking, and the jitter measurement result is given.关键词：bit leaking;\ PLL;\ jitter
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- 摘要：IBAS offers a brand new way for varied non telecommunication service to accessing into SDH networks. What is the difference between IBAS and ATM on accessing method of video service is the focus of this article. The article will compare these two methods and give some conclusions.关键词：IBAS;\ ATM;\ SDH/SONET;\ MPEG;\ Synchronous Inverse Multiplexing
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发布时间： - 摘要：In this paper, we will study how to design the economic SHR with a variety of demand patterns. We first analyze capacity of different SHRs with special demand patterns, and then present two efficient demand loading algorithm: splitting loading algorithm and non splitting loading algorithm for BSHR capacity calculation and analyze the results on a variety of demand patterns.关键词：SDH;\ self healing ring;\ splitting loading algorithm;\ non splitting loading algorithm
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发布时间： - 摘要：This paper introduces the design of a Synchronous Digital Hierarchy（SDH） Application Special Integrated Circuit（ASIC）. The chip can demultiplex and muiltiplex up to 21 E1 signals form and to VC4 frame including codec of E1 line signal, digital desynchronizer, bit rate justification, TU12 pointer interpretation and generation, VC12 overhead termination and generation. The design of the chip not only accords with the ITU T recommendiations but also considers the system application. It has the characters of large scale, comprehensive functions and perfect performances.关键词：SDH;\ ASIC;\ add and drop multiplexer;\ terminal multiplexer;\ self healing ring
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发布时间： - 摘要：There are characteristics of digital/analog signal mixed, multi power, multi ground wire, having too much components and so a high density, etc. with subscriber circuit board, which will bring about interference. Proper and rational distribution and wiring plans an important role in restraining interference. By analyzing several typical interference phenomenon and causatiou that causing it, a series of means to control the interference effectively is raised here. Finally, it indicates the problems to which one should pay more attention when designing power and ground wire in Subscriber Circuit Board.关键词：subscriber circuit;\ printed board wiring;\ EMC
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发布时间： - 摘要：The paper introduced the characterization of singularities, and how to describe it with wavelet transform, and gave a kind of multi scale wavelet transform based on B spline, A new simplified practical denoising algorithm is given with soft thresholding.关键词：wavelet transform;\ denoising;\ B spline;\ soft thresholding
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发布时间： - 摘要：This paper theoretically analyzes EDFA’s effects on signal distortion and carrier noise ration（CNR） when it is applicated in optical fiber CATV system. The performances of EDFA are optimized so that the system has more power abundance and can transmit the signal longer distance.关键词：EDFA;\ signal distortion;\ CNR
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- 60
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发布时间： - 摘要：This paper mainly introduces the measures to reduce the cost of optic fiber access network in Japan, include used new networking technology, ONU and STL, optical active device, nagtive device, optical cable, and engineering technology.关键词：ONU;\ SLT;\ active device;\ concentrated access
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发布时间： - 摘要：The most recent notable trend in worldwide optical fiber production and market will be introduced. It includes the fact that some important US patents concerned with optical fiber fabrication will expire in a few years and its effects on the optical fiber market in years to come, the merger and acquisition trend ,the trend on fiber price descent. This paper also expounds the strategies should be taken by new entrants in optical fiber market.关键词：optical fiber;production and market;\ \ fiber price
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发布时间： - 摘要：In this paper, the principle of spectrum analytical method for optical fiber polarization mode dispersion testing,which is used in the testing instrument, was discussed, and we also introduced the randomicity and variable law of polarization mode dispersion in the weak guided mode fibers. The testing results of this fiber polarization mode dispersion instrument were given.关键词：polarization mode dispersion;\ maxwell distribution;\ palarization state;differential group delay
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发布时间： - 摘要：In this paper, we discuss the structures, performance and features of add/drop multiplexer with fiber gratings and circulators. We have proposed a new multichannel add/drop multiplexer that is constructed by a piece of fiber with a few fiber gratings, circulators, and WDM multiplexer and demultiplexer. Using it, we can obtain each channel signal from the WDM transmission link in the same time. It has less insert loss than that in the simply cascaded single channel optical add/drop multiplexers. The technology of optical add/drop multiplexing in WDM all optical network is one of key technologies for realizing WDM network.关键词：WDM;\ add/drop multiplexer;\ fiber grating
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发布时间： - 摘要：We presents a semiconductor laser amplifier （SLA） with a three wavelength configuration, which works as a nonlinear element and realizes the OTDM demultiplexing function in an optical loop mirror. The simulation shows that its switching time can be less than 10 ps at the holding beam power of 1W, and therefore it has the ability of demultiplexing the signal of any channel from the 100 Gbit/s optical time division multiplexing （OTDM） pulse trains at the control power of 900 mW.关键词：SLA;\ NOLM;\ OTDM;\ demultiplexer
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发布时间： - 摘要：We gave a numerical model to describle the dispersion compensation effect of the fibre gratings. Then ,we calculated the limit of the compensation ability of the chirp gratings in theory.关键词：chirp;\ fibre grating;\ dispersion compensation
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- 156
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发布时间： - 摘要：This paper demonstrates the configuration and theory of fiber compound ring resonator. The effect of parameters on transmission characteristics is presented. Possible applications of the resonator are discussed.关键词：resonator;\ fiber ring resonator;\ optical passive device
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发布时间： - 摘要：The energy equilibrium model—The stability theorem on the strained quantum well structure materials have been introduced in the paper. Some typical photoluminescence spectrum related to the crystal quality degeneration also have been reported. They calculated the critical elasticity stress of some ordinary strained multiquantum well structure materials, and pointed out that the in strained cap layer will increase the critical stress of well layers. The difference between the allowed stress in fact and the calculated one have been discussed for the first time.关键词：strained quantum well material;energy equilibrium model;lattice relax
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