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7946135 Extended-baking process for glass deposition tubes  
Disclosed is a method of heat treating quartz glass deposition tubes at between 900° C. and 1200° C. for at least 115 hours. The resulting deposition tubes are useful in forming optical preforms t...
7836728 Increasing the cladding-to-core ratio (D/d) of low D/d ratio core rods in optical fiber performs  
An optical fiber preform is fabricated by inserting a number of core body pieces end-to-end inside a glass cylinder, wherein the pieces may have a cladding-to-core diameter (D/d) ratio within the...
7752870 Hydrogen resistant optical fiber formation technique  
A method of forming an optical fiber preform using, for example, an MCVD process, is modified to reduce the presence of hydrogen-induced transmission losses in an optical fiber drawn from the...
7486862 Optical fiber and manufacturing method thereof  
A core rod is inserted into a cladding pipe, moisture in a space between the core rod and the cladding pipe is removed, and an optical fiber is drawn while the space is connected to a dry-gas...
7266275 Nonlinear optical fibre method of its production and use thereof  
An optical fiber having a longitudinal direction and a cross-section perpendicular thereto, said fiber in a cross-section comprising: (a) a core region (11) having a refractive index profile with a...
7089765 Method of making a jacketed preform for optical fibers using OVD  
On the basis of a known process for the production of a preform for an optical fiber for optical data transmission technology, the productivity of the process for the production of complex...
7062942 Method of manufacturing glass optical fibre preforms and optical fibres  
A method of making an optical fibre including providing an increased diameter portion on a rod. The rod is assembled by positioning the rod in a tube such that an annular gap is defined between an...
7010203 Optical fiber manufacturing method and optical fiber  
An object of the present invention is to provide an optical fiber manufacturing method and an optical fiber in which an increase in the transmission loss is suppressed by preventing hydroxyl group...
7003984 Hybrid manufacturing process for optical fibers  
A hybrid method of and apparatus for producing a structure capable of being drawn into an optical fiber. The method includes the steps of conducting vapor-phase reactants into an interior region of...
6968107 Holey optical fibres  
An optical fiber structure having a holey fiber arranged in a holey outer support structure made up of holey tubes encased in a thin walled outer jacket. The holey fiber may have a solid core...
6938443 Method for the manufacture of a quartz glass preform for an optical fiber  
The invention relates to a method for manufacture of a quartz glass preform for an optical fibre consisting of the following steps: preparation of a hollow cylinder made of porous quartz glass...
6892018 Micro-structured optical fiber  
A microstructured fiber having a cladding comprising a number of elongated features that are arranged to provide concentric circular or polygonial regions surrounding the fiber core. The cladding...
6883351 Method for fabricating a low polarization mode dispersion optical fiber  
The method of fabricating an optical waveguide fiber from a preform having a centerline aperture which includes reducing the pressure in the centerline aperture, then increasing the pressure in the...
6851281 Method of fabricating rare earth doped optical fibre  
The present invention provides a method of fabricating rare earth doped preforms and optical fibers by a combination of modified chemical vapor deposition (MCVD) process and solution doping...
6848277 Projection lithography photomasks and method of making  
The present invention is a method of making a lithography photomask and photomask blank. The method of making the lithography photomask and photomask blank includes providing a silicon oxyfluoride...
6847771 Microstructured optical fibers and preforms and methods for fabricating microstructured optical fibers  
A microstructured optical fiber is described. The microstructured optical fiber comprises an inner region and an outer region. The inner region includes an inner material and a plurality of holes...
6836605 Optical fiber preform, production method thereof, and optical fiber produced from the preform  
An optical fiber preform having a low core noncircularity and eccentricity for producing an optical fiber having an improved polarization mode dispersion, a method for producing the preform, and an...
6821449 Two step etching process for an optical fiber preform  
This invention relates to a method of preparing an optical fiber preform with the preform having a uniform refractive index profile for the deposited oxide material that ultimately forms the...
6775450 Micro-structured optical fibers  
A micro-structured optical fiber precursor 1 is made by size reducing a multiple core optical fiber having solid multiple cores or a multiple core optical fiber preform O having multiple solid core...
6754425 Dispersion flattened fiber with high negative dispersion and method for the manufacture thereof  
The invention relates to a dispersion flattened fiber (DFF) with high negative dispersion and a manufacturing method thereof. The dispersion flattened fiber comprises a central core; ring-type...
6738550 Holey waveguide manufacture  
A method of forming a holey waveguide, the method comprising the steps of forming a guiding region of a preform, forming a cladding region of the preform, wherein at least a portion of the cladding...
6718800 Method of collapsing a tube for an optical fiber preform  
The present invention provides a method of preparing preforms for optical fibers. The invention allows one to remove or significantly reduce undesirable refractive index variations in the central...
6587633 Active optical fibre doped with rare earth elements  
An active optical fiber (20) having: a silica glass cladding (4), anda glass core (2), doped with a rare earth, comprising a quantity of SiO2 of at least 50% in weight, and a quantity of an oxide...
6574994 Method of manufacturing multi-segmented optical fiber and preform  
A method for manufacturing optical fiber preform and fiber. According to the method, a core cane segment is formed with a refractive index delta preferably between 0.2% and 3% that is most...
6523368 Dispersion-managed fiber preform and fabricating method thereof by MCVD  
There is provided a dispersion-managed fiber preform and a fabricating method thereof preform by modified chemical vapor deposition (MCVD). A core and a clad having the refractive index...
6523369 Method of forming an optical fiber  
A method and apparatus are disclosed for the manufacture of an optical fiber preform having incorporated therein a comparatively high concentration of rare earth dopant material, and which thus can...
6519974 Method for fabricating an optical fiber by simultaneous preform fusing and fiber drawing  
Disclosed is an apparatus for fabricating an optical fiber, which comprises a furnace for melting a sealed preform assembly to draw an uncoated optical fiber, a coater for coating the uncoated...
6519388 Tube-encased fiber grating  
A tube-encased fiber grating includes an optical fiber 10 having at least one Bragg grating 12 impressed therein which is embedded within a glass capillary tube 20. Light 14 is incident on the...
6510711 Apparatus and method for sintering a sol-gel tube using a furnace having a rotating cap  
Disclosed is an apparatus and method for sintering an over-jacketing tube in the zone sintering phase of an optical fiber preform fabrication process using a sol-gel process. The sintering...
6408653 Apparatus and method for manufacturing optical fiber preform by MCVD  
An apparatus and a method for manufacturing an optical fiber preform by modified chemical vapor deposition (MDVD). The apparatus includes a heating device for heating a rotating substrate tube...
6405566 Method and device for over-cladding an optical fiber primary preform  
A method and device for providing an optical fiber secondary preform by collapsing an over-cladding tube on an optical fiber primary preform is disclosed in the present invention. The device for...
6173588 Method of making dispersion managed optical fibers  
An optical fiber having optical characteristics that vary along its length is made by assembling a plurality of cylindrical glass or soot tablets into or along a glass tablet alignment device, then...
6053013 Apparatus and method for overcladding optical fiber preform rod and optical fiber drawing method  
There are provided an optical fiber rod overcladding apparatus and method, and an optical fiber drawing method. In the preform rod overcladding method, a preform rod is clamped in a top chuck and...
5917109 Method of making optical fiber having depressed index core region  
Disclosed is a method of making an optical fiber preform having at least one annular region of depressed refractive index. A tube of silica doped with fluorine and/or boron is overclad with silica...
5868815 Method of making an optical fiber by blowing on a preform tube to enhance collapse  
The specification describes a process and apparatus for monitoring and controlling the ellipticity of preform tubes during Modified Chemical Vapor Deposition. In response to computer generated...
5802236 Article comprising a micro-structured optical fiber, and method of making such fiber  
Disclosed are non-periodic microstructured optical fibers that guide radiation by index guiding. By appropriate choice of core region and cladding region, the effective refractive index difference...
5658363 Method of joining a tube to a rod having an annular rib, so as to form an optical fiber preform  
A method of manufacturing a preform for drawing into an optical fibre comprises positioning a rod within a sleeving tube therefor to form an assembly in which there is an annular space between the...
5578106 Method for making optical fiber preforms by collapsing a hollow glass tube upon a glass rod  
In accordance with the invention, a plurality of elongated refractory bodies are laminated together by placing the bodies in close adjacency, exposing the adjacent bodies to a plasma torch heat...
5198270 Method of forming a fiber preform with dopants dissolved in a liquid  
A method of forming an optical fiber. A solution (12) is prepared in which are dissolved both a ladder siloxane and one or more dopants which are to be incorporated into the final silica or...
5145509 Method of manufacturing optical fibres  
In the manufacture of optical fibers according to the PCVD method, a method is provided wherein the yield of the method (η), in particular at increased deposition rates (m), is raised by reducing ...
5127929 Process for the manufacturing of optical waveguides with fusion of a sleeving tube onto a mother preform  
An optical waveguide preform is fabricated by inserting a rod inside a tube and collapsing the tube. The inner diameter of the tube is adjusted before inserting the rod to provide a predetermined...
5113035 Device for the production of an optical waveguide preform  
In the production of an optical waveguide preform, particularly for the production of mono-mode optical waveguides, a tube, or several tubes, of quartz glass are fused onto a crude preform rod of...
5076824 Method of making fiber optical preform with pyrolytic coated mandrel  
A mandrel (12) that is used for supporting a glass soot cylinder during consolidation into anoptical fiber preform is coated by chemical vapor deposition with a material selected from the group...
5059230 Fabrication of doped filament optical fibers  
Reproducible doped optical fiber preforms having a predetermined dopant concentration level are fabricated by inserting a doped filament into a completed preform prior to consolidation and final...
4944783 Method for producing glass preform for single mode optical fiber  
A glass preform for use in the fabrication of a single mode optical fiber having improved dispersion property is produced by a method comprising steps of forming a porous glass cladding body around...
4941905 Methods of soot overcladding an optical preform  
An optical preform is prepared first by depositing soot about a glass subate rod (22) to form a boule. Then the soot boule is sintered to consolidate the material and provide a preform from which...
4935045 Method of manufacturing a preform for asymmetrical optical fiber  
Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod...
4921516 Method of manufacturing optical fibers with elimination of paraxial refractive-index dip  
In producing a preform for an optical fiber by MCVD technology, involving the buildup of a core matrix of doped silica layers inside a glass tube with subsequent thermal collapse of the structure,...
4869743 Method of manufacturing an optical fiber using a preform obtained by collapsing a tube  
In order to manufacture a fiber by drawing a preform, said preform is made by collapsing a thick-walled silica tube having a reduced pressure established therein and heated in successive passes....
4838915 Method for heating thick-walled glass tubes and apparatus therefore  
A method for heating thick-walled glass tubes, particularly quartz tubes, in the manufacture of optical fibres while using microwave energy. According to the invention, the tube (5) is pre-heated...
Matches 1 - 50 out of 104 1 2 3 >