共查询到20条相似文献,搜索用时 93 毫秒
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自由空间光通信技术的发展 总被引:3,自引:0,他引:3
自由空间光通信(FSO)又称无线光通信,是指以激光(MHz)为载波、自由空间为传输介质的一种通信技术。文中主要介绍了自由空间光通信的优势、特点以及应用价值,分析了自由空间光通信系统在蓝绿激光水下通信方面的应用。 相似文献
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自由空间光通信(FSO)系统性能受激光产品的安全标准、激光的大气传输特性、激光波长及背景噪声等诸多因素限制,在分析计算上述因素影响的基础上给出了短距离FSO系统的一些设计原则和参数。 相似文献
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自由空间光通信系统的设计方法研究 总被引:1,自引:0,他引:1
随着光器件技术的发展,以及凭借着高带宽、方便、快捷等优势.自由空间光通信(FSO)系统已经逐步商用化、实用化。本文结合广东电信FSO商用实验网项目,对自由空间光通信系统的一些设计要点进行分析和研究。 相似文献
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《无线电工程》2018,(3):244-248
逆向调制自由空间激光通信(MRR FSO)系统是将传统FSO链路的一个终端替换成逆向调制器(MRR)而构成的一个非对称FSO系统,因其功耗低、MRR端体积小和易安装等优点,成为自由空间光通信技术研究热点之一。针对MRR FSO系统现存在的捕获系统复杂、对准难度大等技术难题,在原有MRR FSO系统的基础上设计了一种全双工MRR FSO系统。其中光收发机端的共用光学天线模块采用较大孔径的反射式天文望远镜系统,主要用来减小光束发散角、增加接收孔径。MRR端采用单个大尺寸或多个小尺寸MRR器件,来提升反射光信号质量,并搭建室外长距离实验系统,对该MRR FSO系统进行测试,验证了该系统的合理性。结果表明,所设计的全双工MRR FSO系统在长距离全双工激光通信是可行的,为最终实现长距离全双工MRR FSO系统做铺垫,是未来MRR FSO技术的发展方向之一。 相似文献
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分析了自由空间光通信(FSO,Free Space Optica Communication)系统在应用中受气象条件影响的因素.试验通过对哈尔滨市区内的一对试验FSO通信系统在各种气象条件下传输性能的的跟踪测试,以极限恶劣天气(沙尘暴、大雪低温)为例,对FSO系统在黑龙江省的寒温带气候特征下应用时的传输性能作了试验分析,并得出了相关结论及解决办法. 相似文献
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McArdle N. Naruse M. Toyoda H. Kobayashi Y. Ishikawa M. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2000,88(6):829-837
We describe our research on optically interconnected optoelectronic parallel computing systems. Our architecture is based on a multilayer pipeline of two-dimensional optoelectronic device arrays in which each pixel is composed of an optical input channel, a general-purpose programmable processor, local memory, and a surface-emitting laser diode as an optical output channel. Free-space optics provides parallel, global communication between layers in the pipeline via optical paths that are dynamically reconfigurable. Design and initial realization of a system are described 相似文献
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自由空间光 (FSO)技术作为地下光纤网的补充 ,在提供“最后 1km”宽带接入方面与其他的固定无线设备相比有很强的竞争力。虽然通过空气传输光信号仍然存在技术上的挑战 ,但是与敷设光纤网相比 ,FSO成本低、安装快捷 ;与安装其他固定无线网络相比 ,FSO还具有高速宽带和无需许可的特点 ,具有非常好的应用前景。 相似文献
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F.B. McCormick A.L. Lentine R.L. Morrison S.L. Walker L.M.F. Chirovsky L.A. D'Asaro 《Photonics Technology Letters, IEEE》1991,3(3):232-234
Free-space optics for digital optical computing or for electrooptic interconnections is considered. Results of an experiment are presented in which 512 symmetric self-electrooptic effect devices (S-SEEDs) were simultaneously operated. In this experiment, simultaneous continuous bistable operation was shown for the 32*16 array of S-SEEDs, as well as simultaneously optical latching of optical data in a random access manner onto the array.<> 相似文献
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大气效应对通信链路的影响限制了自由空间光通信技术的应用,研究其影响机理和改善方法有利于降低光通信链路的误码率,提升通信速率及距离.总结了大气对自由空间光通信的影响机理,指出了不同大气效应对光通信的影响形式,其中包括光强衰减、脉冲展宽、光强起伏和闪烁、光束漂移、光束扩展、相位起伏等.综述了现有的大气影响改善方法,主要包括大孔径接收、多波长传输、多光束传输、部分相干光传输、自适应光学等技术,并简述了进一步开展工作的方向. 相似文献
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浅谈自由空间光通信技术及其应用 总被引:1,自引:1,他引:0
自由空间光通信技术(FSO)是一种宽带无线接入技术,利用激光束作为信道在大气空间中直接进行语音、数据、图像等信息的双向传送,是光通信技术和无线通信技术相结合的产物。文章首先简要介绍了自由空间光通信技术的起源和发展历史,分析了自由空间光通信技术的基本工作原理及它的优缺点,阐述了自由空间光通信技术的应用领域,并对自由空间光技术的发展现状做了讨论。 相似文献
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Wireless Personal Communications - Optical wireless communication (OWC) also known as free space photonics or free space optics is a data transmission technology in which information is transmitted... 相似文献
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Arnon S. Kopeika N.S. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1997,85(10):1646-1661
A number of serious consortiums develop satellite communication networks. The objective of these communication projects is to service personal communication users almost everywhere on Earth. The intersatellite links in those projects use microwave radiation as the carrier. Free-space optical communication between satellites networked together can make possible high-speed communication between different places on Earth. Some advantages of an optical communication system over a microwave communication system in free space are: (1) smaller size and weight, (2) less transmitter power, (3) larger bandwidth, and (4) higher immunity to interference. The pointing from one satellite to another is a complicated problem due to the large distance between the satellite, the narrow beam divergence angle, and vibration of the pointing system. Such vibration of the transmitted beam in the receiver plane decreases the average received signal, which increases the bit error rate. We review: (1) the present status of satellite networks, (2) developing efforts of optical satellite communication around the world, (3) performance results of vibration effects on different kinds of optical communication satellite networks, and (4) seven approaches to overcome the problems caused by transmitter pointing vibration 相似文献
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Miller D. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2009,97(7):1166-1185
We examine the current performance and future demands of interconnects to and on silicon chips. We compare electrical and optical interconnects and project the requirements for optoelectronic and optical devices if optics is to solve the major problems of interconnects for future high-performance silicon chips. Optics has potential benefits in interconnect density, energy, and timing. The necessity of low interconnect energy imposes low limits especially on the energy of the optical output devices, with a ~ 10 fJ/bit device energy target emerging. Some optical modulators and radical laser approaches may meet this requirement. Low (e.g., a few femtofarads or less) photodetector capacitance is important. Very compact wavelength splitters are essential for connecting the information to fibers. Dense waveguides are necessary on-chip or on boards for guided wave optical approaches, especially if very high clock rates or dense wavelength-division multiplexing (WDM) is to be avoided. Free-space optics potentially can handle the necessary bandwidths even without fast clocks or WDM. With such technology, however, optics may enable the continued scaling of interconnect capacity required by future chips. 相似文献