Patent application number | Description | Published |
20080279516 | Low bend loss coated optical fiber - An optical fiber includes a core and a cladding, said cladding having a refractive index n | 11-13-2008 |
20080279517 | Large effective area fiber - An optical fiber according to an embodiment of the present invention comprises: a glass core extending from a centerline to a radius R | 11-13-2008 |
20080304800 | Optical fiber with large effective area - An optical fiber comprising: a glass core extending from a centerline to a radius R | 12-11-2008 |
20090060435 | Polarization maintaining and single polarization optical fiber - An optical fiber, comprising: (i) a core, (ii) a cladding surrounding the core, (iii) at least one stress member adjacent the fiber core and situated within the cladding, said stress member comprising silica co-doped with B and F. | 03-05-2009 |
20090080843 | Polarization Maintaining And Single Polarization Optical Fiber - An optical fiber, comprising: (i) a core having a core center and a radius or a width a, (ii) a cladding surrounding the core, and (iii) at least one stress member situated proximate to the fiber core within the cladding, said stress member comprising silica co-doped with F and at least one dopant selected from the list consisting of: GeO | 03-26-2009 |
20090120134 | Method and apparatus for measuring surface shape profile - An apparatus for measuring a shape profile of a surface of a sheet of material includes a light source for providing a light beam to be directed at the surface of the sheet of material, a linear translation stage coupled to the light source for translating the light source over the surface of the sheet of material such that the light beam, when directed at the surface, is incident on the surface at multiple positions and produces a reflected light beam at each of the multiple positions, a plurality of light receivers located at predetermined positions for selectively intercepting the reflected light beam produced at each of the multiple positions, a data acquisition device configured to receive information related to position difference between the light source and a selected one of the plurality of light receivers intercepting the reflected light beam produced at each of the multiple positions, and a data analysis device configured to correlate the position difference information to a shape profile of the surface of the sheet of material. | 05-14-2009 |
20090148113 | Large Effective Area Optical Fiber - An optical fiber comprising: (i) a glass core ( | 06-11-2009 |
20090219516 | Fiber Optic Sensing System, Method of Using Such and Sensor Fiber - An embodiment of a sensor fiber includes: at least two fiber sections with a plurality of holes; and at least one other fiber section situated between said at least two fiber sections, wherein the at least one other fiber sections being without the plurality of holes. | 09-03-2009 |
20090274428 | Optical Fiber and a Method of Making - According to one example of the invention an optical fiber comprises: (i) a silica based core, said core having a core diameter greater than 80 μm and a numerical aperture NA≧0.24; and (ii) a silica based cladding in contact with and surrounding the core and having a second index of refraction n | 11-05-2009 |
20100021114 | Double-Clad Optical Fibers And Devices With Double-Clad Optical Fibers - A double-clad optical fiber includes a core, an inner cladding and an outer cladding of silica-based glass. The core may have a radius of less than about 5 μm, a first index of refraction n | 01-28-2010 |
20100021118 | Double-Clad Optical Fibers and Devices with Double-Clad Optical Fibers - A double-clad optical fiber includes a core, an inner cladding and an outer cladding of silica-based glass. The core may have a radius of less than about 5 μm, a first index of refraction n | 01-28-2010 |
20100040336 | Multimode Fiber With At Least Dual Cladding - Multimode optical fiber is disclosed herein having a core surrounded by first and second annular cladding regions. The second annular cladding region has a maximum relative refractive index that is at least 0.05% higher than the minimum relative refractive index of the first annular cladding region. | 02-18-2010 |
20100085558 | Detection System and Optical Fiber for Use in Such System - A detection system comprising: (i) an optical fiber, the optical fiber having (a) a length L≧1 km; (b) beat length between 10 m and 100 m; and (c) beat length uniformity over any distance of at least 100 m within the length L is characterized by standard deviation σ, where |σ|≦10 m; (ii) an OTDR coupled to the fiber and including (a) a radiation source providing pulsed radiation to the fiber, (b) a detection system capable of detecting radiation that is backscattered back through the fiber; and (iii) at least one polarizer situated between the fiber and the detector, such that the backscattered radiation passes through the polarizer before reaching the detector. | 04-08-2010 |
20100086271 | Ultra Low PMD Fibers and Method of Making - A method for making low PMD fiber comprising the steps of: (i) making an initial fiber preform; (ii) modifying said initial fiber preform to introduce higher birefringence than that of the initial fiber preform into modified preform; and (iii) drawing an optical fiber from the modified preform and bi-directionally spinning the drawn fiber during draw. | 04-08-2010 |
20100142890 | +Cylindrical Polarization Beams - Generation of a cylindrically polarized light beam, and in particular, a hybrid-azimuthal-radial polarization beams, called HARP modes, generated from an input linearly polarized Gaussian beam using a spun optical waveguide device is taught. The HARP modes are comprised of hybrid-azimuthal polarization (HAP) and hybrid-radial polarization (HRP) superposition modes. These beams possess a non-zero local angular momentum density that is spatially varying and a zero total angular momentum. | 06-10-2010 |
20100149553 | Method and Apparatus for Determining Sheet Position During Production and Handling - A method for determining a position of a selected area of a sheet of material relative to a reference plane includes launching a first incident light beam at the selected area of the sheet of material such that the first incident light beam strikes the selected area at a first position and a first angle, thereby producing a first reflected light beam. A second incident light beam is launched at the selected area of the sheet of material such that the second incident light beam strikes the selected area at a second position and a second angle, thereby producing a second reflected light beam. The second position and second angle are different from the first position and first angle, respectively. The first reflected light beam and the second reflected light beam are intercepted at the reference plane. Information related to positions at which the reflected light beams were intercepted and angles at which the incident light beams were launched were received and correlated to the position of the selected area relative to the reference plane. | 06-17-2010 |
20100178504 | Bend Insensitive Optical Fibers with Low Refractive Index Glass Rings - An optical fiber includes a silica-based glass portion having an outer diameter of less than about 120 μm. The glass portion comprises a core, an inner cladding and a low index ring. The core comprises an index of refraction n | 07-15-2010 |
20100195194 | Large Mode Area Optical Fiber - A large-mode-area (LMA) optical fiber ( | 08-05-2010 |
20100221501 | GLASS SHEET WITH PROTECTED EDGE, EDGE PROTECTOR AND METHOD FOR MAKING GLASS SHEET USING SAME - A glass sheet assembly includes a glass sheet having an edge surface and a shaped fiber. The shaped fiber has a first surface bonded to the edge surface of the glass sheet and a convex second surface not bonded to the edge surface for receiving a load. | 09-02-2010 |
20100277719 | Intrusion Detecting System With Polarization Dependent Sensing Elements - A detection system includes a length of optical fiber and an OTDR coupled to the optical fiber. The OTDR includes a radiation source providing pulsed radiation to the fiber, a detector detecting radiation that is backscattered through the fiber, and a processor capable of analyzing the variation of the radiation that is backscattered through the fiber. At least two polarization dependent sensing elements are positioned along the length of optical fiber. | 11-04-2010 |
20110265520 | Methods For Determining The Rotational Characteristics Of An Optical Fiber - A method for determining a rotational characteristic of an optical fiber is disclosed. The method includes forming an orientation registration feature in an optical fiber preform and drawing an optical fiber from the preform such that the orientation registration feature formed in the optical fiber preform is imparted to the optical fiber. The optical fiber is then rotated about a longitudinal axis and the direction of rotation is periodically reversed. An orientation signal of the optical fiber is determined based on a position of the orientation registration feature as the optical fiber is rotated. A rotational characteristic of the optical fiber is then determined based on the orientation signal. | 11-03-2011 |
20120123702 | System and Method for Simultaneously Determining Strain and Temperature Characteristics of an Object - A system for simultaneously determining strain and temperature characteristics of an object comprising: (i) at least one optical fiber having at least two Brillouin peaks; (ii) at least one connector securing the optical fiber to the object to be monitored; (iii) a laser positioned to provide laser light to said at least one optical fiber; (iv) a device measuring frequencies of said at least two Brillouin peaks, and determining frequency shifts of said at least two Brillouin peaks for said at least one optical fiber along the length of fiber; and (v) a system calculating strain and temperature characteristics along said fiber, based on the coefficients of strain and temperature as well as the measured Brillouin frequency shifts for said optical fiber along the length of said optical fiber. | 05-17-2012 |
20130047676 | METHOD FOR PRODUCING OPTICAL FIBER HAVING CONTROLLED PERTURBATIONS - A method for producing an optical fiber is provided. The method includes the steps of drawing an optical fiber from a heated glass source in a furnace and introducing index perturbations to the optical fiber via a plurality of perturbation sources arranged at a plurality of different azimuthal locations. The index perturbations are introduced synchronously at different locations along the axial length of the fiber by the plurality of perturbation sources in a generally helical pattern on the outside surface of the fiber in one embodiment. According to another embodiment, the index perturbations are introduced by the plurality of perturbation sources at different frequencies. | 02-28-2013 |
20130077926 | MULTIMODE OPTICAL FIBER AND SYSTEM INCORPORATING SUCH - According to some embodiments, a multimode optical fiber comprises a graded index glass core with refractive index Δ1, a maximum refractive index delta Δ1 | 03-28-2013 |
20140086577 | MULTIMODE OPTICAL FIBER SYSTEMS WITH ADJUSTABLE CHROMATIC MODAL DISPERSION COMPENSATION - Multimode optical fiber systems with adjustable chromatic modal dispersion compensation are disclosed, wherein the system includes a VCSEL light source and primary and secondary optically coupled multimode optical fibers. Because the VCSEL light source has a wavelength spectrum that radially varies, its use with the primary multimode optical fiber creates chromatic modal dispersion that reduces bandwidth. The compensating multimode optical fiber is designed to have a difference in alpha parameter relative to the primary multimode optical fiber of −0.1≦Δα≦−0.9. This serves to create a modal delay opposite to the chromatic modal dispersion. The compensation is achieved by using a select length of the compensating multimode optical fiber optically coupled to an output end of the primary multimode optical fiber. The compensating multimode optical fiber can be configured to be bend insensitive. | 03-27-2014 |
20140086578 | MULTIMODE OPTICAL FIBER SYSTEMS WITH ADJUSTABLE CHROMATIC MODAL DISPERSION COMPENSATION - Multimode optical fiber systems with adjustable chromatic modal dispersion compensation are disclosed, wherein the system includes a VCSEL light source and primary and secondary optically coupled multimode optical fibers. Because the VCSEL light source has a wavelength spectrum that radially varies, its use with the primary multimode optical fiber creates chromatic modal dispersion that reduces bandwidth. The compensating multimode optical fiber is designed to have a difference in alpha parameter relative to the primary multimode optical fiber of −0.1≦Δα≦−0.9. This serves to create a modal delay opposite to the chromatic modal dispersion. The compensation is achieved by using a select length of the compensating multimode optical fiber optically coupled to an output end of the primary multimode optical fiber. The compensating multimode optical fiber can be configured to be bend insensitive. | 03-27-2014 |
20140092380 | METHOD OF MEASURING MULTI-MODE FIBER BANDWIDTH THROUGH ACCESSING ONE FIBER END - A method of measuring the bandwidth of a multi-mode optical fiber using single-ended, on-line and off-line approaches and test configurations. The method includes: transmitting a light signal through the first end of a multi-mode fiber toward the second end of the multi-mode fiber, so that a portion of the light signal is reflected by the second end toward the first end of the multi-mode fiber; and receiving the reflected portion of the light signal at the first end of the multi-mode fiber. The method also includes obtaining magnitude and frequency data related to the reflected portion of the light signal at the first end of the multi-mode fiber; and analyzing the magnitude and the frequency data to determine a bandwidth of the multi-mode optical fiber. The length of the multi-mode fiber may also increase over time during testing. | 04-03-2014 |
20140119701 | MULTIMODE OPTICAL FIBER AND SYSTEMS COMPRISING SUCH FIBER - A multimode optical fiber includes: (i) a graded index glass core having a radius R | 05-01-2014 |
20140318188 | METHODS FOR MODIFYING MULTI-MODE OPTICAL FIBER MANUFACTURING PROCESSES - Methods for modifying multi-mode optical fiber manufacturing processes are disclosed. In one embodiment, a method for modifying a process for manufacturing multi-mode optical fiber includes measuring at least one characteristic of a multi-mode optical fiber. The at least one characteristic is a modal bandwidth or a differential mode delay at one or more wavelengths. The method further includes determining a measured peak wavelength of the multi-mode optical fiber based on the measured characteristic, determining a difference between the target peak wavelength and the measured peak wavelength, and modifying the process for manufacturing multi-mode optical fiber based on the difference between the target peak wavelength and the measured peak wavelength. | 10-30-2014 |
20140319354 | METHODS AND APPARATUS FOR MEASURING MULTIMODE OPTICAL FIBER BANDWIDTH - Methods and apparatus for measuring the modal bandwidth of a multimode optical fiber as a function of wavelength are disclosed. The methods include emitting polarized light from a single-mode fiber, frequency-modulating the single-mode polarized light, and then conditioning the frequency-modulated polarized light to excite multiple modes of the multimode optical fiber. The multimode light transmitted by the multimode optical fiber is detected and analyzed by a network analyzer to determine a bandwidth for at least three different wavelengths. A controller performs a fit to the measured bandwidths using a fitting equation to determine the modal bandwidth as a function of wavelength. | 10-30-2014 |
20140368809 | MULTI-WAVELENGTH DMD MEASUREMENT APPARATUS AND METHODS - A differential mode delay (DMD) measurement system for an optical fiber is provided. The system includes an optical test fiber with a plurality of modes; a single mode light source that provides a continuous light wave signal to a modulator; and a pulse generator that provides an electrical pulse train signal to the modulator and a triggering signal to a receiver. The modulator is configured to generate a modulated optical test signal through the optical fiber based at least in part on the received light wave and pulse train signals, and the receiver is configured to receive the test signal transmitted through the fiber and evaluate the test signal based at least in part on the triggering signal. The system can be employed to create DMD waveform and centroid charts to obtain minEMBc bandwidth information for a fiber within a wavelength range. | 12-18-2014 |
20150086161 | OPTICAL FIBER LINK WITH PRIMARY AND COMPENSATING OPTICAL FIBERS - An optical fiber link that utilizes concatenated primary and compensating multimode optical fibers is disclosed. The primary optical fiber has a first relative refractive index profile with a first alpha value α | 03-26-2015 |