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Green backbone optical networks: the way forward

Green backbone optical networks: The way forward

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8th International conference on Information, Communications and Signal Processing, ICICS 2011

作者： Shen, Gangxiang Deng, Jing Ho, Pin-Han School of Electronic and Information Engineering Soochow University Suzhou China Electrical and Computer Engineering University of Waterloo Waterloo Canada

ISBN: (纸本)9781457700309

optical transport networks have been considered as one of the dominant energy consumers in the modern Internet, wherein the design toward green communication with awareness of energy saving has received growing attention from both industry and academia. this article reviews green designs in the Internet optical transport backbone, particularly on the current progresses in the development of various energy-saving strategies, such as optical bypass configurations and turning off (or sleeping) equipments, as well as the impact on network survivability and security, and renewable energy use. the article will also discuss how the network control plane should be extended to support the energy-saving functionality in the context of Generalized Multi-Protocol Label Switching (GMPLS). © 2011 IEEE.

关键词： Energy conservation

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optical design of SHASM: Segmented hexagon array solar mirror

Optical design of SHASM: Segmented hexagon array solar mirro...

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conference on current developments in Lens design and optical Systems engineering

作者： Huegele, VB NASA George C Marshall Space Flight Ctr SOMTC Huntsville AL 35812 USA

ISBN: (纸本)0819437387

A segmented array of mirrors was designed for a solar concentrator test stand at MSFC for firing solar thermal propulsion engines. the 144 mirrors each have a spherical surface to approximate a parabolic concentrator when combined into the entire 17-foot diameter array. the mirror segments are aluminum hexagons that had the surface diamond turned and quartz coated. the array focuses sunlight reflected from a heliostat to a 4 inch diameter spot containing 8 kilowatts of power at the 15 foot focal point. the derivation of the surface figure for the respective mirror elements is shown. the alignment process of the array is discussed and test results of the system's performance are given.

关键词： segmented mirror array spherical approximation solar thermal propulsion solar power

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Review of the design and manufacturing procedures for large format holographic optical element

Review of the design and manufacturing procedures for large ...

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conference on current developments in optical design and engineering VII

作者： Stojanoff, CG Schütte, H Schulat, J Fröning, P Aachen Tech Univ Rhein Westfal TH Aachen Lehr & Forsch Gebiet Hochtemp Thermodynam D-52056 Aachen Germany

ISBN: (纸本)0819428841

the objective of this research program was the development of the technology for the industrial manufacturing of HOEs for technical applications such as: holographic solar concentrators for utilization in photovoltaic energy conversion and solar photochemistry, and integrated holographic stacks for daylighting, glazing and shading in buildings. Some of the fabricated HOEs exhibit apertures in the order of 8 square meters. the accomplished technology facilitates the continuous fabrication of the holographic films on glass or plastic substrata. the standard holographic material we use for the fabrication of HOEs is dichromated gelatin (DCG) on glass or plastic film (PET) substrata the dichromated gelatin layer could be prepared with different compositions to accommodate the desired exposures and chemical processing procedures. At present we manufacture holographic plates on glass substrata in sizes of up to 1 meter square. the holographic film on plastic substratum is 20 cm wide and could be made in lengths of hundredths of meters. the inexpensive fabrication of such large formats is attained by automation of the entire process: film manufacturing, hologram copying, development and test. We present in this paper the design considerations and the developed manufacturing procedures. these comprise the fabrication of large format reflective holograms for concentrating mirrors and the copying of transmissive holograms, such as gratings and lenses, using in-plane contact copying in checkerboard arrangement or rotating drum continuous copying onto an endless plastic film.

关键词： holography HOE large aperture optics fabrication procedures optical materials solar concentrators

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design of lens hoods for the "Lira-B" space telescope 19

Design of lens hoods for the "Lira-B" space telescope

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19th conference on current developments in Lens design and optical engineering

作者： Muratov, Artem Olyunin, Vyacheslav Bacholdin, Alexey Voznesenskaya, Anna ITMO Univ 49 Kronverksky Av St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

the space investigation project "Lira-B" is purposed to perform a high-precision multicolor photometric all-sky survey of objects from 3 to 16 m. this investigation concludes in multiple photometric measurements in ten spectral bands from 200 to 1000 nm. Such telescope systems should provide maximum light gathering and meet stray light requirements. the main goal of the given work is optical design of the telescope system with lens hoods protecting against the parasitic illumination. Analysis of impact of the lens hoods' surface structure and coatings on the image quality is performed and ways to reduce the stray light in the system. the modeling is carried out using Zemax OpticStudio software in the non-sequential mode.

关键词： Lira-B Zemax lens hood telescopic system

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High magnification zoom lenses for 3-5 μm applications

High magnification zoom lenses for 3-5 μm applications

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conference on current developments in optical design and engineering VII

作者： Sinclair, RL Wescam Inc Flamborough ON L9H Canada

ISBN: (纸本)0819428841

Over the past twenty years numerous papers and patents have reported on the design of infrared zoom lenses for a variety of civilian and military applications. the vast majority of these lenses have been afocal 8-12 mu m zoom lenses with magnification ratios of five to twenty. With the advancement of 3-5 mu m staring focal plane array technology a growing demand has emerged for a compact imaging 3-5 mu m zoom lens. To meet this demand a variety of such zoom lenses have been designed which support image formats of over 10 mm diagonal. In this paper the preliminary design of a high magnification 3-5 mu m zoom lens is described. Infrared system modeling, detailed lens performance and manufacturing issues are reviewed.

关键词： infrared lens zoom lenses diffractive optical elements lens design

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design of an adaptive Fresnel lens using design thinking methodology and cost analysis 19

Design of an adaptive Fresnel lens using design thinking met...

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19th conference on current developments in Lens design and optical engineering

作者： Santiago Alvarado, Agustin Cruz Felix, Angel S. Santiago Gomez, Stephanie L. Ruiz Zavala, Soledad Osorio Garcia, Adelita Iturbide Jimenez, Fernando Univ Tecnol Mixteca Carretera Acatlima Km 2-5 Huajuapan De Leon 69000 Oaxaca Mexico

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

the main characteristic of adaptive lenses is to change their shape, and consequently their focal length, by modifying their physical parameters. On the other hand, Fresnel lenses have such features as large aperture, short focal length, they are slim and reduced in size. these kind of lenses have become very popular due to their applications, such as in compound eyes, optical communication systems, photolithography, imaging systems, etc. Nowadays, several kinds of tunable lenses exist such as those made with dielectric materials, lenses that change their focal length by varying the refractive index of the material, liquid lenses composed by elastic membranes and solid elastic lenses. In this work, we present the design, simulation of the mechanical behavior using Finite Element Method (FEM) and cost analysis of an Adaptive Fresnel Lens made of an elastic material, together with a mechanical mounting system. Our study considered the use of design thinking methodology to obtain the best optical design at minimal cost. Analysis, results and future applications are presented.

关键词： Adaptive Fresnel lens design thinking optical design

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current and next-generation passive optical networks monitoring solution

Current and next-generation passive optical networks monitor...

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8th International conference on High-Capacity optical Networks and Emerging Technologies, HONET 2011

作者： Esmail, Maged Abdullah Fathallah, Habib King Saud University Riyadh Saudi Arabia Electrical and Computer Engineering Department Laval University QC Canada

ISBN: (纸本)9781457711695

In order to enable new services that require high data rates over longer distances, the optical fiber substitutes the copper cable step by step in the access network area. Time division multiplexed Passive optical network (TDM-PON) is a fast emerging architecture that uses passive components only between the customer and the central office. PON operators need a monitoring system for the physical layer to guarantee high service quality. this monitoring system is necessary during the fiber installation, final testing, regular operation of the network, and for fault localization. In this paper, we present our monitoring system based on optical coding for PON maintenance. this system has almost all the monitoring features required by a network operator. We explained the design and the principle operation of the technique. Moreover, we presents a management and protection solution for long-reach PON networks. Our system design achieves high reliability performance with almost half the cost if full network protection is used. © 2011 IEEE.

关键词： Monitoring

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the impact of zonal irregularity on infrared lens performance 6

The impact of zonal irregularity on infrared lens performanc...

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current developments in optical design and engineering VI conference

作者： Sinclair, RL Wescam Inc 45 Innovation Drive Flamborough L9H 7L8 ON Canada

ISBN: (纸本)0819422517

High performance infrared optical designs require careful tolerancing to ensure that the as built performance meets the system requirements. Using modem optical design programs a wide variety of single element and group tolerances can be defined and statistical analysis employed to formulate a prediction of the as built performance. When the number of units being produced is small or near diffraction limited performance is required, then a worst case analysis is often employed to generate a more accurate prediction. However, in some situations, such as low F/number lenses, certain effects that may be important are not always adequately addressed by first order tolerance analysis. this paper reviews one such effect;zonal irregularity or slope errors. To quantify the impact of zonal irregularity on the MTF performance of an infrared lens, detailed comparisons are made between measured and predicted performance. Interferometric analysis of the lens element irregularity is incorporated within the design to predict the as built lens line spread function.

关键词： infrared lens optical tolerances interferograms

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design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding

Design and fabrication of low-cost thermal imaging optics us...

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conference on current developments in Lens design and optical engineering IX

作者： Curatu, George LightPath Technol Orlando FL 32826 USA

ISBN: (纸本)9780819472809

Aspheric and diffractive surfaces in infrared materials are traditionally fabricated by single point diamond turning, which is a high-cost, low-throughput process, not suitable for low-cost, high-volume applications. Precision molding of chalcogenide glasses is a novel process we developed to allow the efficient fabrication of quality infrared optics in large volumes. In this paper we present the advantages and particularities of designing thermal imaging lenses for high-volume applications using precision molded chalcogenide glasses. As an example, we present a compact 19 mm F/1.1 infrared lens design for a 320 x 240 uncooled detector array operating from 8 to 14 microns. the excellent image quality and transmission of tested prototypes prove that precision molding of chalcogenide glasses is an ideal optical fabrication technology for the high-volume production of infrared optics.

关键词： infrared lens design thermal imaging precision glass molding chalcogenide glasses athermal design diffractive optics

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optical coatings for the optical concentrator with the prism film 19

Optical coatings for the optical concentrator with the prism...

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19th conference on current developments in Lens design and optical engineering

作者： Jaing, Cheng-Chung Wan, Wei-Li Yang, Pao-Keng Ying, Shang-Ping Chen, Bing-Mau Minghsin Univ Sci & Technol Dept Optoelect Syst Engn 1 Xinxing Rd Hsinchu 30401 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Effects of a coating combination, a prism film and a phosphor layer on the short current of the solar cell in the optical solar concentrator and the illuminance of the sunlight passing through the samples were investigated. the optical solar concentrator was a 50 mm x 50 mm x 5 mm B270 thick glass with its sides connected by a solar cell. the prismatic structure of the prism film had a period of 50 mu m. A phosphor Y560 having an absorption band of 390 nm to 500 nm and emitting from 490 nm to 700 nm was prepared. Six coating combinations applied in this study were composed of optical filters and glass. the optical filters included infrared cut-off, magenta, red, green and blue filters. the deflection angle was between 31 and 33 degrees when the incident sunlight passed through the prism film. the short current of the solar cell in the optical solar concentrator with the prism film, the coating combination and the phosphor layer was largest in this study. Experimental results show that the coating is more suitable for enhancing the short current than the phosphor layer in the optical solar concentrator with the prism film. And the phosphor layer can increase the illuminance of the sunlight passing through the samples due to the human eye sensitivity.

关键词： optical concentrator coating prism film phosphor layer short current illuminance optical filter solar cell

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