Matches 251 - 300 out of 340 < 1 2 3 4 5 6 7 >
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5101461 Optical fiber amplifier apparatus  
An optical amplifier apparatus which amplifies a signal light in an optical fiber includes an optical fiber having a core containing a rare-earth dopant element and an excitation light source...
5091983 Optical modulation apparatus and measurement method  
In an optical micromechanical method for changing the phase of guided waves and a measurement method for measuring very small mechanical displacements and/or mechanical forces or pressures,...
5061857 Waveguide-binding sensor for use with assays  
An optical waveguide-binding sensor which increases sensor sensitivity to fluorescence detection during assays of liquids based on adjustments in the V number along the optical waveguide. The...
5058977 Broadband tunable in-line filter for fiber optics  
A broadband tunable in-fiber filter includes a grating with divergent ridges which can be translated transversely of a side-polished optical fiber to vary the periodicity at an exposed evanescent...
5054871 Semiconductor waveguide and impedance-matched detector  
An impedance-matched semiconductor detector formed on a portion of a waveguide. The waveguiding layer of the waveguide has one refractive index and the light absorbing layer of the detector has...
4993797 Optical fibre lattice signal processors  
The optical fibre lattice signal processor comprises at least two coupling devices through which two optical fibres pass in a manner permitting optical coupling therebetween. The optical coupling...
4986624 Optical fiber evanescent grating reflector  
A periodic grating structure is placed on a facing surface formed on an optical fiber so that the grating structure is within a portion of the evanescent field of an optical signal propagating...
4976512 Narrowband fiberoptic spectral filter formed from fibers having a refractive index with a W profile and a step profile  
A narrowband optical fiber spectral filter comprises a fiber optic coupler formed from a W fiber and step index fiber. The W index fiber comprises a core having a high index of refraction. The core...
4963832 Erbium-doped fiber amplifier coupling device  
This invention is directed toward reducing substantially the loss incurred when two optical fibers of different mode diameters are coupled together. In this invention, the coupling of one fiber to...
4955028 Wavelength tunable composite cavity laser  
Wavelength tunability and single frequency output are achieved in a coherent light source employing an adjustably controllable reflector. The light source includes a gain medium coupled to a...
4927223 Optic fiber correlator  
An optic fiber correlator having a first laser and a second laser emitting with the same frequency and with an amplitude modulated respectively by a first and second signal which are correlated....
H000668 Nonlinear optical apparatus using optical fibers  
A nonlinear second order signal processing apparatus having a number of high quality optical fibers that are embedded in a nonlinear optical material in such a way that their cores are in...
4852967 Evanescent wave sensors  
The present invention relates to a novel evanescent wave sensor which can have a high numerical aperture and is capable of being used in various forms of optically-based assays. Unlike previous...
4842368 N×N single-mode optical waveguide coupler  
The present invention relates to a N×N single-mode optical coupler employing evanescent wave coupling between mutually adjacent optical waveguides sufficiently close to one another to facilitate...
4828350 Fiber optic mode selector  
An all fiber mode selector comprises a single-mode optical fiber and a double-mode optical fiber, each having a facing surface formed on one side of the cladding. The facing surfaces are juxtaposed...
4815804 In-line fiber optic memory and method of using same  
A fiber optic recirculating memory comprises a splice-free length of optical fiber which forms a loop that is optically closed by means of a fiber optic coupler. The coupler couples an optical...
4815817 D-shaped fiber  
A D-shaped fiber which has an evanescent-field which is easily tapable has a low attenuation since a buffer material disposed on a cladding planar side of the waveguide has an index of refraction...
4810052 Fiber optic bidirectional data bus tap  
A fiber optic data bus tap includes a tap coupler for coupling signals traveling in either direction in a data bus fiber into one of two lengths of a tap fiber. The signals are then guided to a...
4798438 Method of making a single-mode evanescent-wave coupler having reduced wavelength dependence  
A method of making a single-mode evanescent-wave coupler having reduced wavelength dependence includes the steps of (a) providing first and second single-mode optical fibers having substantially...
4795233 Fiber optic polarizer  
In the present invention, a multilayer stack of alternating layers of a metal and a dielectric is deposited directly onto the surface of an optical fiber that has been processed to remove the...
4795226 Optical fibre reflective diffraction grating devices  
An optical device comprising a length of optical fibre of predetermined convex configuration supported by fibre mounting and/or attachment means, the convex outer part of the optical fibre having a...
4792200 Array of coupled optical waveguides  
An array of coupled waveguides in the form of MCRW laser diodes and/or passive waveguides are coupled to one another by optical waves of the TM-mode occurring in semiconductor regions between the...
4779945 Directional coupler utilizing biconically tapered optical fibers and a method of making same  
A fiber optic directional coupler comprising a pair of strands of single mode optical fiber having biconical tapers whereby the electromagnetic field within the fibers extend virtually to the...
4778237 Single-mode fiber optic saturable absorber  
A fiber optic saturable absorber for processing optical signals comprises an optical fiber from which a portion of the cladding is removed to form a facing surface. A light-absorbing substance...
4775216 Fiber optic sensor array and method  
A fiber optic sensor array comprises a single transmit optical fiber for guiding an incident optical signal through a plurality of sensing segments in the transmit optical fiber arranged in a...
4768850 Cascaded fiber optic lattice filter  
A fibre optic lattice filter having a transfer function wherein the poles and zeros are adjustable independently of each other. The filter comprises a cascaded configuration of recursive and...
4768849 Filter tap for optical communications systems  
A filter tap for optical communication systems includes an optical resonant cavity comprising generally parallel, facing dielectric mirrors spaced to permit resonance in a selected band of...
4763974 Δβ-Phase reversal coupled waveguide interferometer  
An improved electro-optic coupled waveguide interferometer (50) is provided. The device comprises a single input (52), a Y-junction splitter (54), two interferometric arms (56a, 56b), a Y-junction...
4753497 Directional coupler for coupling single-polarization optical fibers  
A directional coupler for coupling two single-polarization optical fibers each comprising a core, a cladding, and an elliptic jacket having a major axis is made by preparing two quartz substrates...
4738503 In-line fiber optic memory  
A fiber optic recirculating memory comprises a splice-free length of optical fiber which forms a loop that is optically closed by means of a fiber optic coupler. The coupler couples an optical...
4738511 Molecular bonded fiber optic couplers and method of fabrication  
A fiber optic coupler is formed by heating juxtaposed optically flat surfaces formed on two lengths of optical fiber to the glass transition temperature. The fibers bond together while preserving...
4737007 Narrow-band wavelength selective optical coupler  
Narrow band, wavelength selective optical coupling is achieved in a device including first and second optical transmission media and a filter. The first and second optical transmission media are in...
4735484 Acousto-optic frequency shifter utilizing multi-turn optical fiber  
A fiber optic frequency shifter comprises an optical fiber having an acoustic conducting medium for propagation of an acoustic signal. The acoustic medium is preferably shaped as a rod, and the...
4733938 Magneto-optic rotator  
A single, continuous strand of fiber optic material is wrapped about a mandrel to form oval-shaped loops having parallel sides and curved ends. A magnet is positioned so that its B-field is...
4723827 Fiber optic switch and discretely variable delay line  
A single mode optical fiber switch having a base (70) and a laterally slidable top (91). The base is composed of a quartz block (70) with a slight radius of curvature along its length supporting a...
4721352 Polarizing apparatus and method utilizing an optical fiber  
An apparatus selectively transmits light in one of two orthogonal polarizations in an optical fiber. The apparatus has a facing surface formed at one location on the fiber to expose the evanescent...
4708424 Transmissive single-mode fiber optics star network  
Apparatus and method for interconnection for fabrication of combinatorial transmissive star couplers suitable for single-mode fiber optic local area networks. Various types of couplers including...
4693545 Apparatus for the controlled transmission of light  
The invention provides a method for controlling the transmission of radiant energy through a light transmissive medium and an apparatus whereby the method can be effected. The method includes the...
4688882 Optical contact evanescent wave fiber optic coupler  
A single mode, evanescent wave, fiber optic coupler. The coupler comprises a pair of substrates, each substrate having an optically worked fiber embedded therein and wherein the substrates are...
4681397 Optical switching arrangement  
A cross point of an N×M optical switching network is defined by a pair of switches, a first of which couples optical information from a row waveguide to a bypass waveguide. The second switch...
4679894 Electrically switched fiber optic directional coupler  
This invention relates to an electrically switchable fiber optic directional coupler. Two oppositely oriented blocks of an interaction material are placed adjacent the fibers in an evanescent field...
4676585 Continuously variable fiber optic delay line  
A continuously variable optical delay line having a first substrate (66, 70) and a second substrate (95). The first substrate is composed of a quartz block (70) with a large radius of curvature...
4676583 Adscititious resonator  
An optical fiber structure having resonant characteristics useful for coupling to an optical transmission line for removing selected wavelengths of light energy includes a light guiding structure,...
4673270 Channel add/drop filter-coupler  
A channel add/drop filter-coupler includes two single-mode optical fibers that have different refractive index profiles. Each optical fiber has a propagation constant that is a function of...
4669816 Optical waveguide coupler  
A single mode optical waveguide directional coupler is provided with enhanced wavelength selectivity by dividing the coupling region up into a number of identical sections (12) between which are...
4669814 Single mode, single polarization optical fiber with accessible guiding region and method of forming directional coupler using same  
An optical fiber comprising a core and cladding having different refractive indices and forming a single-mode guiding region, the core having a non-circular cross-section defining two transverse...
4652079 High speed pulse train generator  
There is disclosed a high speed pulse train generator for generating a train of pulses having arbitrarily close spacing. The apparatus consists of a generator loop comprised of a fiber optic...
4630885 Multichannel optical wave guide resonator  
A multichannel optical waveguide resonator having a plurality of evanescently coupled optical dielectric waveguide rings and an input optical waveguide and an output optical waveguide located...
4630884 Method and apparatus for monitoring optical fiber lapping and polishing  
In this invention, the depth of lapping an optical flat on optic fibers is monitored while the fiber is mounted on the lapping fixture. A collimated light beam is tangentially incident upon the...
4615582 Magneto-optic rotator for providing additive Faraday rotations in a loop of optical fiber  
A single, continuous strand of fiber optic material is wrapped about a mandrel to form oval-shaped loops having parallel sides and curved ends. A magnet is positioned so that its B-field is...
Matches 251 - 300 out of 340 < 1 2 3 4 5 6 7 >