共查询到20条相似文献,搜索用时 62 毫秒
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本文概述了密集波分复用系统中光复用/解复用滤波器、光纤、光放大器、光分/插复用器、光交叉连接器等器件,并对其发展作了简要介绍。 相似文献
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波分复用无源光网络系统方案研究 总被引:2,自引:0,他引:2
介绍了波分复用无源光网络的原理,比较了功率分割无源光网络和波分复用无源光网络的特点。介绍了波分复用无源光网络系统方案,并分析了其优缺点,提出了波分复用无源光网络的升级方案。 相似文献
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随着光波分复用系统的建设,关于光波分复用系统的测试项目也成了大家讨论的热门话题。我们参考ITUT相关建议及惠普公司、郎讯公司的相关资料,对光波分复用系统的系统测试项目进行了整理。1光波分复用系统的测试点光波分复用系统的测试点如图1所示。2测试项目2... 相似文献
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WDM系统本质上是光域上的模拟系统,WDM技术第一次把复用方式从电域转移到光域,在光域上用波长复用(即频率复用)的方式提高传输速率,光信号实现了直接复用和放大,而不再回到电信号上处理,因而大大增加了光电器件,而且光模拟系统的性能很大程度上取决于各器件... 相似文献
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通过数学分析,定量地描述了高密度光波分复用传输系统的信道串扰与信道间隔及其信道带宽的关系,从理论上计算出了单模光纤低损耗窗口在各种情况下最多能复用的信道数。简单介绍了光波分复用器的性能指标及适应于不同光波分复用传输系统中的光波分复用器 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
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“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献