| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 065393000 | Hollow optical fibers or waveguides | 6 |
| 20090056383 | HOLEY OPTICAL FIBER WITH RANDOM PATTERN OF HOLES AND METHOD FOR MAKING SAME - A random array of holes is created in an optical fiber by gas generated during fiber drawing. The gas forms bubbles which are drawn into long, microscopic holes. The gas is created by a gas generating material such as silicon nitride. Silicon nitride oxidizes to produce nitrogen oxides when heated. The gas generating material can alternatively be silicon carbide or other nitrides or carbides. The random holes can provide cladding for optical confinement when located around a fiber core. The random holes can also be present in the fiber core. The fibers can be made of silica. The present random hole fibers are particularly useful as pressure sensors since they experience a large wavelength dependant increase in optical loss when pressure or force is applied. | 03-05-2009 |
| 20090095023 | ULTRA HIGH NUMERICAL APERTURE OPTICAL FIBERS - Various embodiments described include optical fiber designs and fabrication processes for ultra high numerical aperture optical fibers (UHNAF) having a numerical aperture (NA) of about 1. Various embodiments of UHNAF may have an NA greater than about 0.7, greater than about 0.8, greater than about 0.9, or greater than about 0.95. Embodiments of UHNAF may have a small core diameter and may have low transmission loss. Embodiments of UHNAF having a sufficiently small core diameter provide single mode operation. Some embodiments have a low V number, for example, less than 2.4 and large dispersion. Some embodiments of UHNAF have extremely large negative dispersion, for example, less than about −300 ps/nm/km in some embodiments. Systems and apparatus using UHNAF are also disclosed. | 04-16-2009 |
| 20090133445 | Method for manufacturing glass body and method for manufacturing optical fiber - A method for manufacturing a glass body containing bismuth, which can be used for manufacturing an optical fiber having a low background-loss is provided. The method includes depositing a glass micro-particle layer on an inner wall of a glass pipe, consolidating the glass micro-particle layer to form a glass layer, reducing of a diameter of the glass pipe having the glass layer on the inner wall of the glass pipe, and collapsing the glass pipe having been reduced in diameter at the diameter-reducing step so as to form the glass body. At the depositing step, the glass micro-particle layer is formed while an organobismuth compound is being supplied into the glass pipe. At the consolidating step, the glass layer is consolidated while an organobismuth compound is being supplied into the glass pipe. The optical fiber is made by drawing the glass body. | 05-28-2009 |
| 20120118019 | METHOD OF PRODUCING OPTICAL FIBER - A method of producing an optical fiber that has a hole extending in a longitudinal direction includes preparing a glass preform that has a hole extending in a longitudinal direction, synthesizing a porous preform layer by depositing silica-based glass particles on an outer circumference of the glass preform, dehydrating the porous preform layer, sintering the dehydrated porous preform layer under a reduced pressure so that the porous preform layer becomes a translucent glass preform layer that contains closed pores, and drawing a translucent glass preform that includes the glass preform and the translucent glass preform layer so that the translucent glass preform layer becomes a transparent glass layer. | 05-17-2012 |
| 20140013808 | HOLEY OPTICAL FIBER WITH RANDOM PATTERN OF HOLES AND METHOD FOR MAKING SAME - A random array of holes is created in an optical fiber by gas generated during fiber drawing. The gas forms bubbles which are drawn into long, microscopic holes. The gas is created by a gas generating material such as silicon nitride. Silicon nitride oxidizes to produce nitrogen oxides when heated. The gas generating material can alternatively be silicon carbide or other nitrides or carbides. The random holes can provide cladding for optical confinement when located around a fiber core. The random holes can also be present in the fiber core. The fibers can be made of silica. The present random hole fibers are particularly useful as pressure sensors since they experience a large wavelength dependant increase in optical loss when pressure or force is applied. | 01-16-2014 |
| 20160376185 | METHOD AND DEVICE FOR MANUFACTURING AN OPTICAL PREFORM BY MEANS OF AN INTERNAL VAPOUR DEPOSITION PROCESS, AND A CORRESPONDING SUBSTRATE TUBE ASSEMBLY - A device for manufacturing an optical preform by means of an internal vapour deposition process including an energy source, a hollow substrate tube having a supply side and a discharge side and the energy source being moveable along a length of the hollow substrate tube, and an elongation tube connected to the hollow substrate tube at the discharge side thereof, wherein the hollow substrate tube extends into an interior of the elongation tube and an internal diameter of the elongation tube is at least 0.5 millimeters larger than an external diameter of the hollow substrate tube. | 12-29-2016 |
