共查询到20条相似文献,搜索用时 22 毫秒
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Baack C. Walf G. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1993,81(11):1624-1632
In future telecommunication systems, efforts will be made to exhaust the almost unlimited transmission capacity of optical fibers by applying optical frequency-division-multiplexing (OFDM) techniques. The switching elements of such networks must be able to process OFDM signals as well as time-division-multiplexing (TDM) signals. The extent to which optical signal processing can be brought into use instead of present-day electronic signal processing in such switching elements is examined. Several experiments involving OFDM technologies are described which are intended to underline the significance of those technologies for future telecommunication networks. Various techniques for and experiments on the optical switching of signals in the frequency, space, and time domain are described. Experiments dealing with optical signal regeneration are described 相似文献
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液芯波导在拉曼光谱研究中的应用及其研究进展 总被引:2,自引:1,他引:1
采用液芯波导系统进行液体样品的光谱研究具有相当高的探测灵敏度,本文对液芯波导系统在拉曼光谱中的应用及其研究进展作了比较全面的综述.分析了液芯波导系统的特点及其影响液芯波导拉曼光谱强度的主要因素及其激励采集方法、液芯波导中的光漂白效应及其对荧光背景的消除作用,以及液芯波导中的光散射机制问题,并对液芯波导的主要应用做了详细介绍. 相似文献
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近场光学显微镜可以突破传统光学显微镜的衍射极限限制,其分辨能力主要取决于探针的几何尺寸,而与波长无关。本文介绍了应用化学镀和烧结渗金镀制金膜制作纳米级光纤微探针的方法。 相似文献
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《Lightwave Technology, Journal of》2008,26(16):2848-2856
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本文介绍了基于激光的干涉特性,以氦氖激光器发出的波长为(基准)计量单位,测量压入深度的基准洛氏硬度机。主测量系统中选用楔形镜,阶梯移相、角锥棱镜来消除回光与旋光影响的方案。同时简要介绍了激光干涉系统中光信号的数据处理及本机技术性能。 相似文献
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首先介绍低温共烧陶瓷(LTCC)技术和数字光收发模块,阐述LTCC的技术特点、工艺流程以及它相较于传统PCB电路基板的优势,解释了数字光收发模块的通信原理和工作方式;其次,提出了一种基于LTCC电路基板的数字光收发模块的设计方案,详细介绍了该光模块的主要构成和实现方法,包括电路设计和关键器件的比较和选取;最后,通过对该方案所述的数字光收发模块的样件进行关键指标和性能测试,验证了该设计方案的可行性。 相似文献
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根据目前光缆进线室存在的问题,提出了光缆进线室设计的新理念,详细描述固话铜缆上线列架与光缆上线列架的不同之处,并对进线室的大小、上线列架的方式进行探讨.对双伸臂式列架进行全面的介绍。 相似文献
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Free space adaptive optical interconnect at 1.25 Gb/s, with beam steering using a ferroelectric liquid-crystal SLM 总被引:1,自引:0,他引:1
A free space adaptive optical interconnect is reported, in which an optically modulated channel from a vertical-cavity surface-emitting laser at 1.25 Gb/s is steered using reconfigurable binary phase gratings displayed on a ferroelectric liquid crystal on silicon (LCOS) spatial light modulator (SLM), to correct for misalignment. The optical system, and addressing scheme to maintain a transparent optical path, is described. The measured optical losses total 13.6 dB, sufficient to give a bit error rate (BER) of 10/sup -12/ with current optical transmitter and receiver technology. This is, to our knowledge, the first demonstration of a high-speed data transmission through an adaptive optical interconnect using an "off-the-shelf" commercial ferroelectric display panel. 相似文献
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A monolithic integration of an optical neurochip with variable interconnection capability is reported. The neurochip is a three-dimensional optoelectronic integrated circuit, in which a variable sensitivity photodetector is directly fabricated on a light emitting diode. The principle of operation and the fundamental characteristics of the monolithic neurochip are described in detail. The optical crosstalk was significantly reduced and the optical coupling efficiency between the light emitting diode and the variable sensitivity photodetector was improved as compared to the previous hybrid structure. The monolithic neurochip is suitable for a large scale integration because there is little optical crosstalk, high efficiency, and no need of optical alignment 相似文献
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The present status and research trends in light sources, detectors, and various optical components are described, focusing mainly on those for single-mode fiber systems. Laser-diode and light-emitting-diode sources are described, and their problems and advantages are examined. The features of optical detectors, namely, avalanche and p-i-n photodiodes are discussed. A method of comparing the performance of optical receivers with different detectors, by examining the minimum detectable power at a specified error probability for the received pulses, is presented. Optical components such as optical filters, couplers, dividers, isolators, connectors, and switches are considered briefly. The potential of optoelectronic integrated circuits is discussed 相似文献
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光纤放大器的泵浦问题 总被引:4,自引:2,他引:2
文章结合光纤放大器的工作原理和应用,对其泵浦光源的技术要求与泵浦光输入方式作了较为全面的阐述。由此可以看出,对于不同用途的光纤放大器,其泵浦光源本身和应用中的泵浦方式也是一个广阔的研究开发领域。 相似文献
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An optical receiver suitable for a 10 Gbit/s direct detection optical transmission system is described. It uses a pin diode, commercial GaAs MESFETs and hybrid construction techniques on a coplanar substrate. The measured sensitivity of the receiver is -20.4 dBm, which is the best reported sensitivity at 10 Gbit/s for a pin-FET optical receiver to date.<> 相似文献
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A reciprocal time multiplexer-demultiplexer for optical PCM is proposed. The device is based on the coincidence of an optical pulse and a modulating voltage pulse in an electrooptic crystal. Both a lumped and a traveling-wave configuration are described. 相似文献
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提出两种分数傅里叶变换数值计算新方法。本文用分数傅里叶变换描述信息在光学系统中的传输过程 ,分别基于分数傅里叶变换与菲涅尔变换之间联系和基于基本光学单元 (薄透镜及其组合 )实现分数傅里叶变换。该算法与光传输物理过程有着直观的联系 ,计算时光学系统的焦距、距离等参数可调。避免了传统算法中“变换核”等复杂计算 ,便于计算复杂光路和缩短计算时间。以三种飞机 (及字符 )光学模式识别实验为例 ,给出了空域 -频域变换混合光路的计算流程与结果 相似文献
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Koji Yasukawa Ken'Ichi Araki Kanshiro Kashiki Tadashi Aruga 《International Journal of Satellite Communications and Networking》1988,6(2):141-152
The current state of research and development activities of optical intersatellite links (ISLs) and related optical devices in Japan, including semiconductor laser diodes, photodiodes, CCDs and modulation/demodulation techniques, is described. Subjects for further research on optical devices and communications are summarized. An optical communication experiment which uses the communications system on board the Engineering Test Satellite-VI to be launched in Japan in 1992, is outlined. 相似文献
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Van Breusegern E. Cheyns J. De Winter D. Colle D. Pickavet M. De Turck F. Demeester P. 《Selected Areas in Communications, IEEE Journal on》1996,14(5)
To efficiently support the highly dynamic traffic patterns of the current Internet in large-scale switches, we propose a new hybrid optical network design: Overspill Routing In Optical Networks (ORION). By taking advantage of the reduced (electronic) processing requirements of all-optical wavelength switching, the electronic bottleneck is relieved. At the same time, ORION achieves a level of statistical multiplexing comparable to the more traditional point to point WDM solutions, circumventing the bandwidth inefficiencies of all-optical wavelength switched networks, caused by dynamic traffic patterns. The result is a true hybrid optical network design, forming a bridge between these two switching concepts. In this paper the generic concept of ORION is described. An example node design, based on current advanced optical technologies, is described in detail. The ORION concept is also evaluated, comparing it with its two composing technologies, optical wavelength switching and point to point WDM, as well as a third, more trivial, hybrid one, through several case studies. 相似文献