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Topic: Optical communication

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Learn more about Communications satellite in the online encyclopedia. Communications satellites provide a technology that is complementary to that of fiber optic submarine communication cables. A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications using radio at microwave frequencies. The first geosynchronous communications satellite that could be seen from a fixed satellite antenna (over North America) was Anik 1, a Canadian satellite launched in 1973. www.onlineencyclopedia.org /c/co/communications_satellite.html   (493 words)

Optical communications device - Patent 5969839 An optical communications device is disclosed which is equipped with a transmission unit adapted to send binary-coded electrical pulse signals to another optical communications device in the form of optical pulse signals. The optical communications device according to claim 2, wherein said demodulation means provides a high-level electrical pulse signal of a fixed pulse width each time an electrical pulse signal that is narrow in pulse width is output from said opto-electrical conversion means. This transmission device 20 is adapted to two-way optical communications with an external optical communications device through a single optical fiber 21, and comprises an application function unit 22, a communications LSI 23, a transmitter circuit 24, and a receiver circuit 25. www.freepatentsonline.com /5969839.html   (6494 words)

Device offers promise for faster optical communications Optical communication systems transmit signals over hair-thin glass fibers, each capable of carrying huge amounts of data over as many as 100 channels. A device used to separate the channels, or wavelengths, in optical fibers is called an arrayed waveguide grating, which is actually a complex optical circuit contained on a glass-silicon wafer about one or two inches in diameter. Weiner's research group earlier pioneered optical systems that "shape" and manipulate pulses of laser light, technology now being used in laboratories around the world, especially in physics and chemistry research to study and control ultra-fast processes inside molecules. news.uns.purdue.edu /html4ever/0105.Weiner.optical.html   (637 words)

INTHFT: Optical Communications After having conceived and defined experiments for demonstrating fundamentals of quantum mechanics, the specific objective of a present study is to accommodate existing optical free-space technology for quantum communication purposes. In the field of fiber communications we investigate the simultaneous transmission of several broad-band signals over a single fiber, so-called wavelength-division multiplexing (WDM), both experimentally and by simulation. In the area of integrated optical interconnections we are working on the integration of optical waveguides into circuit boards. www.nt.tuwien.ac.at /optical   (651 words)

Photonics and Optical Communications Optical communications is a field that today impacts every developed and developing country on the earth. Optical fiber communications are now used inside individual buildings, around campuses, throughout small and large cities, across nations and linking together most nations around the world. As it relates to photonics, I have contributed to the field of optical communications and this is one of the important areas of photonics technology, so we will focus our comments today on optical communications. www.finisar.com /frankscorner/20020620.php   (2694 words)

MULTIGIGABIT OPTICAL COMMUNICATIONS Because optical signals still have to be routed to their destinations through computer switches, communications now suffer from the "electronic bottleneck". In communications systems, the number of waves per second (or hertz) represents a rough measure of its potential bandwidth or ultimate carrying capacity. In this case the fiber will not work as a replacement for copper wires but will be used for a system when a single fiber optic cable carries several channels of various data types with each channel being used a different wavelength (frequency). www.lanl.gov /lanp/optical-nets.html   (1861 words)

optical data communication training/optical communications Optical communication systems have progressed very rapidly from the research labs into commercial applications. Future optical communication networks for terabit transmission rates require the use of optical routing to cope with ever increasing capacity demand due to growing internet traffic. As optical communication system technologies have improved, an increasing variety of applications have become technically feasible and economically attractive. www.lightwavetc.com /box17.html   (665 words)

Optical Communications A key operational feature in such an optical network is the ability to synchronize the switching node to the incoming different data streams to facilitate efficient switching/routing decisions. Next-generation reconfigurable optical networks that interconnect many high-capacity media immersi-stations are expected to accommodate fine-granularity traffic switching, shifting complexity from electrical to optical equipment and at the same time increasing throughput. Synchronization, especially all-optical synchronization to allow for the ever-increasing bandwidth requirements, is crucial for preventing packet and information loss in switched optical networks. imsc.usc.edu /research/project/opt_comm.html   (145 words)

Free Space Optics :: Technology Optical wireless networks based on FSO technology must be designed to combat changes in the atmosphere, which can affect FSO system performance capacity. Optical wireless also eliminates the need to buy expensive spectrum (it requires no FCC or municipal license approvals worldwide), which further distinguishes it from fixed wireless technologies. Optical wireless, based on FSO-technology, is an outdoor wireless product category that provides the speed of fiber, with the flexibility of wireless. www.freespaceoptics.org   (1382 words)

Lecture: Optical Communications I and II Optical Communications I and II Lecture: Optical Communications I and II Prof. The course deals with special aspects, requirements and potentials of optical as compared to conventional communication systems. An introduction is given to the topics of optical fiber amplifiers and to soliton propagation. www.om.tu-harburg.de /Lehre/Vorlesungen/optcommunication.htm   (228 words)

IEEE Optical Communications IEEE Optical Communications promises to be a significant part of our initiative to bring together and better serve the growing community working in the field of optical communications. As Director of Magazines for the IEEE Communications Society, I am very pleased to announce this new quarterly publication. www.comsoc.org /optical   (66 words)

NIST and the Communications Industry Optical Components Group—characterizes the properties of optical fiber and optical communication systems components; develops wavelength standards for optical communications. Standard Reference Materials for optical fibers—here's a list of optical fiber and wavelength calibration standards for telecommunications. Communications firms have been competing for the Baldrige Award since it was established in 1988. www.nist.gov /public_affairs/communication.htm   (1725 words)

FIBERWORK OPTICAL COMMUNICATIONS His PhD degree in optical fiber communications was obtained at the Optoelectronics Research Centre, Southampton, United Kingdom and his Master degree in coherent optical communications was obtained at the Faculty of Electrical Engineering, Unicamp, Brazil. He is the founder and technical director of FiberWork Optical Communications Ltd. Before that, he was with the Dept. Fiberwork is a company specialized in optical fiber communication technology, continuously updated with technological trends. www.fiberwork.com.br /site/english/sbarcelos.htm   (386 words)

OPTICAL COMMUNICATIONS AND INTERSATELLITE LINKS A secondary, though not unimportant, fact about optical communications is that, unlike the rf spectrum which is regulated by national and international agencies, the optical spectrum is currently unregulated. At JPL, the emphasis has been on space-earth communications at planetary distances which usually support only hundreds of kbps or a few Mbps, but the 10 cm aperture Optical Communications Demonstrator (OCD) shown in Figure 3.22 is capable of up to 250 Mbps and is being upgraded to 1 Gbps capability for near-earth experiments. Intersatellite communications is used primarily for "networking" a constellation of satellites at data rates up to many Gbps or for data relay purposes from tens of Mbps up to Gbps. www.wtec.org /loyola/satcom2/03_06.htm   (2597 words)

Optical Communications We study the characteristics of some novel optical devices, which are the enabling technologies for high-speed optical signal processing and utilize them to perform some networking functions. Optical fiber is the dominant media for long distance high-capacity transmission systems. We design novel optical techniques to monitor the working status of some major network elements where any performance degradation or component failure can be detected and reported. www.ie.cuhk.edu.hk /index.php?id=135   (304 words)

Defects boost optical communications (October 2000) - News - PhysicsWeb Japanese scientists have created a device that could revolutionise optical communications by paving the way for all-optical circuits. They found that the defect behaved as an optical resonator with a resonant frequency that depends on its size. The team believes that this flexibility - combined with the geometry, efficiency and very small size of the new device - could have an enormous impact in global communications networks. physicsweb.org /article/news/4/10/1   (432 words)

Optical Wireless Communications We are beginning to witness an exciting era for researchers and developers of optical wireless communications; optical wireless technologies have already expanded their presence into a broad range of traditional communications markets. Optical wireless is also widely available on personal computers, peripherals, embedded systems and devices of all types, terrestrial and in-building optical wireless LANs, and intersatellite link applications. Optical wireless products ranging from TV remote control to IrDA ports currently have a worldwide installed base of over 200 million units with a 40% annual growth. www.osa-jon.org /abstract.cfm?URI=JON-4-3-119   (361 words)

Williams Communications to Provide eTech Global Communications With Optical Wave Service Williams Communications' network currently has 26,000 route miles of fiber deployed, 24,000-route miles lit and is planned to total 33,000 route miles connecting 125 cities by the end of this year. "Our optical wave service is unique in the broadband industry, providing carrier customers with an option that spans the gap between buying dark fiber and leasing capacity," said Frank Semple, president of Williams Communications' network. Based in Tulsa, Okla., Williams Communications had revenues of $2 billion in 1999 and today has 9,000 employees primarily in North America, with offices in Europe and Asia and investments in South America and Australia. www.wiltel.com /overview/content/pressreleases/2000/03-01.htm   (625 words)

Optical Communications in Space Optical phased arrays provide laser communication systems with the inertia-free and hence ultra-fast, beam scanning ability needed for accurate beam pointing, efficient area scanning and reliable link tracking in the presence of spacecraft attitude jitter. Today, the problem of acceptance of optical free-space communication in the commercial payload market is not so much a technical one but rather the lack of its convincing in-orbit demonstration to the commercial satellite communications community. SILEX is a free-space optical communication system which consists of two optical communication payloads to be embarked on the ESA Artemis (Advanced Relay and TEchnology MIssion Satellite) spacecraft and on the French Earth-observation spacecraft SPOT-4. esapub.esrin.esa.it /bulletin/bullet91/b91lutz.htm   (2643 words)

Tektronix Enables a New Era in Optical Communications The 40- and 50-GHz modules (the 80C05 and 80C06) expand the power of Tektronix' CSA8000 Communications Signal Analyzer to enable the design and manufacturing of optical networking components based upon emerging OC-768 and STM-256 standards. BEAVERTON, Ore., March 5, 2001 - Tektronix, Inc. (NYSE: TEK), a leading provider of test and measurement equipment for telecommunications component and equipment manufacturers, today announced the industry's first solutions for testing 40 Gb/s optical networks - test tools critical to the development of next-wave optical communications infrastructures. According to telecom market research firm RHK Inc, the worldwide market for optical components will grow from $5 billion in 2000 to nearly $24 billion by 2004. www.tek.com /Measurement/Products/press/wave2comp   (327 words)

Optical Communications (Full Report) These are used to transfer the information with an optical beam, and this beam can be used in various communication schemes to enable the most effective or desired method of moving the information, including optical multiplexing when plural information signals or plural transmitters and receivers are utilized. The communication may be through free space, fibers or waveguides. Such communication includes transmitting an intelligence-bearing signal from one point to another in the form of variations in a characteristic of the light wave. www.marketresearch.com /redirect.asp?productid=1124085&progid=3603   (160 words)

EE402A: Optical Communications Systems The students will have a good knowledge of the principles and practice of modern optical communications and be aware of current developments and future opportunities. Learning Outcomes: The students will acquire a good knowledge of the principles and practice of modern optical communications and be aware of current developments and future opportunities. The course will give an overview of optical communications from principles of fibres through to modern developments in the latest high speed networks. www.eeap.aston.ac.uk /modules/EE402A.html   (464 words)

Optical Networks Magazine Optical Networks Magazine is an international, peer-reviewed magazine that gives you timely reports on the challenges and opportunities driving the research, development, and commercialization of optical communications technologies. SPIE and Kluwer Academic Publishers extend their thanks and appreciation to all of the editors, authors, and subscribers who contributed to the magazine. For information about paid subscriptions that have not run out, please contact membership@spie.org or telephone +1 360 676 3290. optical-networks.com   (89 words)

OICETS (Optical Inter-orbit Communications Engineering Test Satellite) A Japanese experimental communications satellite to be launched by JAXA (Japan Exploration Agency) in 2005. The crux of its mission will be a conversation with ESA’s (European Space Agency’s) ARTEMIS fixed-orbit communications satellite, using an array of pointing, targeting, and acquisition hardware. By proving the space-worthiness of these technologies, OICETS will help lay the foundation for a global communications network to support broadcast television, mobile communications, computer connections, and manned spacecraft. www.daviddarling.info /encyclopedia/O/OICETS.html   (170 words)

IBM Redbooks Understanding Optical Communications Although it is intended for professionals who already have some technical background, it is nevertheless relevant to anyone wishing to understand optical communication. This book presents a high level technical overview of the emerging technologies of fibre optical communications and optical networking. Written at the ".technical conceptual" level it is intended as an introduction to the field for computer and data communication professionals. www.redbooks.ibm.com /abstracts/sg245230.html   (89 words)

Optical Communications The main purpose is to couch these fundamentals in a context that serves as the backbone for device, components and sub-system development for use in high speed optical data and information links and networks. Nine credit hours must be from the courses designated for the specific certificate and three hours (one course) is an elective from approved graduate optics courses. www.ucf.edu /gradcatalog/grad9900/cert_optcomm.htm   (106 words)

ITS Projects: Fiber Optics Basics An optical repeater is used to boost the light pulse in a fiber-optic cable. Optical fiber is also desirable because of it's electromagnetic immunity. The research and writing was done by advanced-level students of the School of Telecommunications, Ohio University, under supervision of Don Flournoy, Professor and Director, Institute for Telecommunications Studies. www.tcomschool.ohiou.edu /its_pgs/fiber.html   (2722 words)

Flight R & D When the optical communications telescope looks back at earth for acquisition and tracking and downlink, the sun is generally in the background and at times partially within its field of view. The NASA/JPL patented optical communications demonstrator (OCD) is a laboratory prototype development of a scalable architecture that with minor modifications could accommodate optical communications links from airborne platforms to near-earth-space-borne satellites to planetary-spacecraft. We are proposing a series of initial air-to-ground optical communications demonstrations to demonstrate acquisition tracking and pointing (ATP) and high data rate (~ 1-2.5 Gbps) transmission of data. lasers.jpl.nasa.gov /PAGES/flight.html   (2079 words)

About Optical Fiber Communications Laboratory In standard communication fibers, the length scale over which the optical fiber birefringence varies randomly is 30 -100 m, while the dispersive and nonlinear scale lengths are typically hundreds of kilometers. The invention and deployment of erbium-doped fiber amplifiers (EDFAs) in the 1990s revolutionized high-data-rate optical fiber communications. Accurately characterizing the optical and electronic filters in the receiver, as well as the clock recovery system, is critical when determining performance. www.photonics.umbc.edu /home/members/cmenyuk/research.html   (1978 words)

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