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Topic: Optical waveguide

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Optical waveguide - Wikipedia, the free encyclopedia Optical waveguides can be classified according to their geometry (planar, strip or fiber waveguides), mode structure (single-mode, multi-mode), refractive index distribution (step or gradient index) and material (glass, polymer, semiconductor). The optical waveguide can be used as an component in integrated optical circuits or as a transmission medium in local or long haul optical communication systems. An optical waveguide is a form of a dielectric waveguide that is capable of guiding an optical signal. en.wikipedia.org /wiki/Optical_waveguide   (100 words)

Optical waveguide switch - Patent 4805975 An optical waveguide switch according to claim 1, in which said waveguides are made of a light conductive semiconductor material and said optically controlled switch element is made of an optically nonlinear material responsive to light rendered to be totally reflective when the incident light energy exceeds a given light intensity threshold. An optical waveguide switching according to claim 1, in which said loop feedback waveguide is disposed in the vicinity of the intersection region in communication with said one of the waveguides. An optical waveguide switch according to claim 7, in which the Bragg wavelength of the Bragg reflection type branching filter is equal to the wavelength of the excitation light to the Bragg reflection type branching filter. www.freepatentsonline.com /4805975.html   (2532 words)

Class Definition for Class 385 - OPTICAL WAVEGUIDES Optical modulation that occurs within the area of total internal reflection of an optical waveguide belongs in this class, whereas modulation occurring outside the optical waveguide is classified elsewhere. The waveguiding structures which can be connected (as defined herein) include optical fibers, optical fiber bundles, nonfiber-like optical waveguides, and electro-optical transmitting or receiving devices (e.g., semiconductor laser diodes). An integrated optical circuit including a combination of an optical waveguide and a device of the Class 357 type is classified here provided the combination does not meet the requirement of a still larger system class. www.uspto.gov /go/classification/uspc385/defs385.htm   (3843 words)

Optical waveguide element and method for preparation thereof - US Patent 6818577 An optical waveguide element as described in claim 1, wherein the glass material is in a substrate form having a thickness of 5 mm or less, at least one surface of which is in a state of a mirror surface having a surface roughness Ra of from 0.001 to 0.1 µm. The optical waveguide formed in the glass material may be formed on the surface of the glass material, but such a structure is preferred that the Ag ion doping region is embedded within the glass material. An optical waveguide element as described in claim 1, wherein the glass material has a refractive index of 1.50 or less with respect to a near infrared ray having a wavelength of from 1,200 to 1,650 nm. www.patentstorm.us /patents/6818577.html   (2167 words)

Optical waveguide with protective coating - Patent 4173393 Optical waveguides require high strength for cabling processes and system installation. The waveguide recited in claim 3 wherein said coating is applied as a liquid which contracts as it cools to place the surface of said tube under compression thereby strengthening it. The waveguide recited in claim 7 wherein said liquid metal is heated to apply it as a coating and solidifies as it cools to room temperature. www.freepatentsonline.com /4173393.html   (2001 words)

Device for coupling a light source or receiver to an optical waveguide - US Patent 5940564 Now that the optical properties of waveguide 12 and transducer 14 have been discussed, it is time to turn to the description of the interaction of these elements with the coupling system 16. Communication systems are now being developed in which optical waveguides such as optical fibers are used as conductors for modulated light waves to transmit information. The refractive index, n, of the medium incident on the waveguide 12 multiplied by the sine of the half angle of the focused beam is known as the numerical aperture, NA, of the beam. www.patentstorm.us /patents/5940564.html   (10779 words)

Dielectric optical waveguide couplings - Patent 4102717 A dielectric optical waveguide coupling machine as claimed in claim 10 wherein said photo-diode is mounted in a housing hinged to said column, and biased towards an open position and a closed position by a pair of over centre mounted springs. A dielectric optical waveguide coupling machine as claimed in claim 20 wherein said photodiode is mounted in a housing hinged to said column, and biased towards an open position and a closed position by a pair of over center mounted springs. As the two dielectric optical waveguides to be coupled are brought closer to the correct alignment less and less of the light is radiated from the vicinity of the joint, since most of the light is now being coupled into the second dielectric optical waveguide. www.freepatentsonline.com /4102717.html   (3115 words)

United States Patent: 6,777,715 The optical waveguides include a highly reflective material that is deposited so as to line an inner surface of the high aspect ratio holes which may be filled with air or a material with an index of refraction that is greater than 1. For example, optical transmitter 104a is coupled to one end of optical waveguide 102a and optical receiver 106a is coupled to a second, opposite end of optical waveguide 102a. Optical waveguide 102a is coupled to functional circuits 108a and 109a. web.engr.oregonstate.edu /~flf/6777715.html   (5258 words)

Optical Waveguide Taps on silicon CMOS circuits The optical waveguides are made from polymer materials for economy of processing and for polymer planarization properties. In particular, the proposed technology distributes signals optically via integrated optic waveguides over the surface of a circuit board or CMOS chip. The optical signals are split up by wavelength to multiple, series "tap" circuits, where the optical signal is efficiently converted back to an electrical one at very high speed. www.ececs.uc.edu /~psdl/projects/WaveguideTaps/WaveguideTaps.htm   (665 words)

Waveguide In the optical regime, a waveguide used as a long transmission line consists of a solid dielectric filament (optical fiber), usually circular in cross section. Waveguide propagation modes depend on the operating wavelength and polarization and the shape and size of the guide. In the microwave regime, a waveguide normally consists of a hollow metallicconductor, usually rectangular, elliptical, or circular in cross section. www.therfcc.org /waveguide-41202.html   (217 words)

Waveguide fabrication using organic nonlinear optical materials To solve a problem of the crystal, i.e., the crystal with water is inactive for second-order optical nonlinearity, a specific photo-process was proposed and a ridge waveguide was fabricated using the photo-process combined with a reactive ion etching. Organic and polymeric waveguides with optical nonlinearity will be discussed which include electro-optic polymer waveguides and an organic crystal waveguide. A bis-azo-dye attached poly-methylmethacrylate (PMMA) with large optical nonlinearity was successfully fabricated into a channel waveguide by using a standard photo process and reactive ion etching. www.na.infn.it /amalfi99/abstract_Kaino.htm   (241 words)

Definition: optical waveguide Note: Optical waveguides may be (a) thin-film deposits used in integrated optical circuits (IOCs) or (b) optical fibers. optical waveguide: Any structure having the ability to guide optical energy. www.atis.org /tg2k/_optical_waveguide.html   (66 words)

(WO 01/46731) RECONFIGURABLE ADD/DROP MULTIPLEXER FOR FIBER OPTIC NETWORKS A transmission filter (106, 164) is in optical communication between the input optical waveguide and the receiver optical waveguide (120, 170) with the transmission filter being tunable to drop a select channel to the receiver optical waveguide (120, 170) and to reflect the remaining channels of the multi-channel optical signal. The transmission filter is tuned to drop a select channel to the receiver optical waveguide and to reflect the remaining channels of the multi-channel optical signal to a retransmission optical waveguide in optical communication with the main optical fiber. A selectively reflective apparatus (108, 168) is in optical communication between the receiver optical waveguide and the second receiver optical waveguide for selectively reflecting the dropped channel or transmitting the dropped channel to the second receiver waveguide. wipo.int /cgi-pct/guest/getbykey5?KEY=01/46731.010628&ELEMENT_SET=DECL   (443 words)

Patent Detail Subsequently, after adhering a multilayer wiring board to the optical waveguide via an adhering layer made of a photosetting resin, the adhering layer is irradiated with light so as to be set, thereby fixing the multilayer wiring board to the optical waveguide. The peelability promoting film promotes the peelability between the transparent substrate and the optical waveguide with sufficient adhesion that it is not peeled off from the transparent substrate during formation of the optical waveguide. Disclosed is a method of manufacturing an optical waveguide, capable of easily manufacturing an optical waveguide which can hold an excellent light propagating characteristic irrespective of the kind of a supporting substrate. www.designinfo.com /engineering-search/patents/abstract/120301700033/Method_of_manufacturing_optical_waveguide   (289 words)

Dielectric waveguide An example of a dielectric waveguide is optical fiber. Microwave and Optical Waveguide Analysis by the Finite Element Method (Electronic & Electrical Engineering Research Studies. In telecommunication a dielectric waveguide is a waveguide that consists of a dielectric material surrounded by another dielectric material as air glass or plastic with a lower refractive index. www.freeglossary.com /Dielectric_waveguide   (149 words)

PolyurethaneWeb: Polyurethane foams, coatings, adhesives, elastomers and equipment. An optical waveguide is disclosed in which a section of the waveguide core is vertically tapered during formation by spin coating by controlling the width of an underlying mesa structure. The vertically-tapered waveguide section can be used to provide a vertical expansion of an optical mode of light within the optical waveguide. A laterally-tapered section can be added adjacent to the vertically-tapered section to provide for a lateral expansion of the optical mode, thereby forming an optical spot-size transformer for efficient coupling of light between the optical waveguide and a single-mode optical fiber. www.polyurethaneweb.com /patents.php?patno=&pubdate=&titel=&abstract=&no=232535&aktion=2&order=DD   (154 words)

EXFO OWA-9500—Optical Waveguide Analyzer The OWA-9500 Optical Waveguide Analyzer is the only commercial refractive index profiler for integrated optical waveguides, a technology that is being widely used in the next generation of telecom optical devices. Optical waveguide design and performance is critical, and so is the need for better characterization. The OWA-9500 meets the industry’s need for RIP characterization during the optical waveguide fabrication process. www.exfo.com /en/products/ProductsView.asp?Product=150   (436 words)

PolyurethaneWeb: Polyurethane foams, coatings, adhesives, elastomers and equipment. The optical waveguide structure and the LED resin case are bonded by, in one embodiment of the invention, a light or thermally curable resin that is applied and further solidified. In a second embodiment of the invention, a photopolymer, sensitive to the light emerging from the waveguide, is used to bond the LED resin case and the optical waveguide structure. An input end of the optical waveguide is mounted proximal and substantially perpendicular to the surface. www.polyurethaneweb.com /patents.php?patno=&pubdate=&titel=&abstract=&no=237027&aktion=2&order=DD   (229 words)

Definition: thin-film optical waveguide thin-film optical waveguide: A slab-dielectric waveguide that consists of multilayered films of material of different optical characteristics, is capable of guiding an optical signal, and may be used as a component in integrated optical circuits. www.atis.org /tg2k/_thin-film_optical_waveguide.html   (52 words)

Title page for etd-0801103-214919 In the application of nonlinear optical waveguide structure, the three-layers nonlinear waveguide structure and the local nonlinear Mach-Zehnder waveguide interferometer structure will be discussed: In the three-layers nonlinear waveguide structure, by launching the symmetric and antisymmetric modes, various characteristics of spatial optical solitons will be observed. The nonlinear optical waveguide is a medium whose refractive index changes with the electric field intensity. In the paper, the beam propagation method is used to analyze the characteristics and the applications of nonlinear optical waveguide structures. etd.lib.nsysu.edu.tw /ETD-db/ETD-search/view_etd?URN=etd-0801103-214919   (227 words)

Modeling of Optical Waveguide Structures These are used to connect efficiently the optical fibers with the integrated waveguides. The Beam Propagation Method (BPM) is well established for the calculation of wave propagation in integrated optical waveguide structures. This is essential, because of the significant difference of the propagating modes in the waveguide and the fiber. www.ifh.ee.ethz.ch /~spuehler/work.html   (217 words)

QEP.P3.14.doc This waveguide can be used as a wavelength dependent delay line and to enhance nonlinear effects such as second-harmonic generation. However, as the name implies, because this waveguide has strongly resonant properties, coupling light into the waveguide is still a challenge. The FDTD method was used to simulate the optical propagation of the modified CROWs. www.photon04.org /Abstract/QEP.P3.14.doc   (209 words)

Optical waveguide sensor, device, system and method for glucose measurement (US6903815) Optical chemical sensor and method using same employing a multiplicity of fluorophores contained in the free volume of a polymeric optical waveguide or in pores of a ceramic waveguide a second optical waveguide layer located between the entrance grating and the exit grating while being in contact with the first optical waveguide layer, the second optical waveguide layer having a higher refractive index than that of the first optical waveguide layer; and a functioning layer containing an enzyme and a coloring reagent which is formed on the second optical waveguide layer. www.delphion.com /details?pn=US06903815__   (283 words)

Micromachined Optical Waveguide Cantilever (ResearchIndex) An optical waveguide is formed from a 2.2 mm thick SiO 2 layer deposited on a single crystal silicon wafer and etched to yield a SiO 2 /Si composite slab cantilever. Abstract: Design, fabrication, and testing of a micromachined cantilever beam that is optically transmissive and operates in the resonant mode is presented with application as a micro-optical scanner. Using a novel capacitively coupled reactive ion etching (RIE) technique, a cavity is back-etched in the silicon to release the 30--40 mm thick... citeseer.ist.psu.edu /610577.html   (459 words)

Coaxial periodic optical waveguide Yariv and A. Gover, "Equivalence of the coupled-mode and Floquet-Bloch formalisms in periodic optical waveguides," Appl. It is possible that the waveguide structure can be applied to filters or optical fibers to reduce nonlinear effects. Guided modes in a dielectric waveguide structure with a coaxial periodic multi-layer are investigated by using a matrix formula with Bessel functions. www.opticsexpress.org /abstract.cfm?URI=OPEX-7-1-10   (444 words)

Experimental study on the origin of optical waveguide losses by means of Rayleigh backscattering measurement In order to evaluate the magnitude of scattering in those waveguides, an optical low coherence reflectometry experiment has been conducted, showing that the amount of backscattered light is not enough to explain that difference in losses. Scattering is often considered as the main cause of the huge attenuation difference between optical fibers and integrated optical waveguides. I. Salinas, I. Garcés, R. Alonso, J. Pelayo, and F. Villuendas, "Experimental study on the origin of optical waveguide losses by means of Rayleigh backscattering measurement," Opt. www.opticsexpress.org /abstract.cfm?URI=OPEX-13-2-564   (323 words)

Sorting of polystyrene microspheres using a Y-branched optical waveguide Polystyrene microparticles, optically guided in the waveguide’s evanescent field, are directed down the desired, more strongly illuminated, output branch. Tanaka and S. Yamamoto, “Optically induced propulsion of small particles in an evanescent field of higher propagation mode in a multimode channeled waveguide,” Appl. Sorting of polystyrene microspheres using a Y-branched optical waveguide www.opticsexpress.org /abstract.cfm?URI=OPEX-13-1-1   (487 words)

Optical Waveguide 2D Mode Solver Bitline 2D Mode Solver calculates the mode profile of optical rib waveguide and optical rectangular waveguide. Users define the dimentions of the waveguide and the wavelength of the optical field. Bitline 2D Mode Solver is a set of software that helps users to design and analyze some common two-dimension optical waveguide problems. www.myspecial.com.au /Waveguide/waveguide.asp   (192 words)

FEM Books-Koshiba Current topics of the application of the finite element method to various optical waveguide problems, such as planar optical waveguides, optical channel waveguides, optical fibers, polarization-maintaining optical fibers, optical gratings, optical waveguide discontinuities, nonlinear optical waveguides, optical solitons, and quantum well structures, are presented. This book starts with a brief review of electromagnetic theory for optical waveguide analysis, then the concepts of the finite element method and its fundamentals are described in detail. The finite element techniques for solving the most general optical waveguide problems are discussed. ohio.ikp.liu.se /fe/kosh.html   (146 words)

Optical waveguide couplers save space: News from FibreFab A new generation of Optronics optical waveguide couplers using planar silica glass technology has been introduced by FibreFab. Based on news supplied by FibreFab - Subject: Optronics optical waveguide couplers Nominal chip size for a typical 1 x 16 waveguide coupler is only 32 x 6 x 3mm. www.electronicstalk.com /news/fib/fib101.html   (191 words)

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