Silica Tech, LLC

Other

Fibercore Limited

Dau Wu

Mohd Aslami

Mikhail I Guskov

Mikhail Ivanovich Gouskov

Evgueni B Danilov

DeLuca Charles

Mohammad Afzal Aslami

Evguenie B Danilov

Eugenie B Danilov

John Edward Mattison

Evgueni Borisovich Danilov

Evguenic Borisovich Danilov

Mohd A Aslami

A process and apparatus for making silicon or silicon/germanium core fiber is described, which uses a plasma process with reducing agent to make preform. The process also makes the recommendations in selecting the adequate cladding tube for better fiber properties. An improved fiber drawing apparatus is also disclosed in order to draw this new type of preforms.

Process, apparatus, and material for making silicon germanuim core fiber

A method and apparatus for making an optical fiber preform, including injecting a plasma gas source into the first end of a tubular member; generating a ring plasma flame with the plasma gas source flowing through a plasma gas feeder nozzle, the plasma gas feeder nozzle including: an inner tube, an outer tube, wherein the plasma gas source is injected between the inner tube and the outer tube to produce the ring plasma flame, such that at least a portion of the ring plasma flame is directed radially toward the inner surface of the tubular member; traversing the tubular member along the longitudinal axis relative to the plasma flame; depositing at least one soot layer on the interior surface of the tubular member by introducing reagent chemicals into the plasma flame; and fusing all of the soot layers into a glass material on the interior surface of the tubular member.

Ring plasma jet method and apparatus for making an optical fiber preform

A process and apparatus for making silicon or silicon/germanium core fiber is described, which uses a plasma process with reducing agent to make a preform. The process also makes the recommendations in selecting the adequate cladding tube for better fiber properties. An improved fiber drawing apparatus is also disclosed in order to draw this new type of preform.

Process, apparatus, and material for making silicon germanium core fiber

The improved plasma torch for making synthetic silica includes use of nitrogen screen gas from outer quartz tubing to provide active environment isolation. In addition, the present induction plasma torch includes a ring disk for more compact but complete environmental protection (360 degree coverage). It also includes offsetting and switching the position of the chemical injection nozzles for allowing improved deposition in both directions, when operated in a horizontal mode. Further, the present induction plasma torch maintains laminar flow for the injected chemicals and the middle quartz tube is provided with a concave section for increasing the average enthalpy of plasma jet, thus improving the efficiency of the plasma torch. In addition, it may utilize more plasma gas inlets. It also includes chemical injection nozzles having a downward angular inclination.

Plasma torch for making synthetic silica

A plasma deposition apparatus for making polycrystalline silicon including a chamber for depositing said polycrystalline silicon, the chamber having an exhaust system for recovering un-deposited gases; a support located within the deposition chamber for holding a target substrate having a deposition surface, the deposition surface defining a deposition zone; at least one induction coupled plasma torch located within the deposition chamber and spaced apart from the support, the at least one induction coupled plasma torch producing a plasma flame that is substantially perpendicular to the deposition surface, the plasma flame defining a reaction zone for reacting at least one precursor gas source to produce the polycrystalline silicon for depositing a layer of the polycrystalline silicon the deposition surface.

Plasma deposition apparatus and method for making polycrystalline silicon

A plurality of glass deposition targets are rotated simultaneously and a first plasma torch, having a coil diameter larger than the sum of the target diameters, deposits glass simultaneously on the plurality. After the diameter of the targets reaches a threshold a second plasma torch is used. The diameter of the second plasma torch can provide for simultaneous deposition. In a further embodiment, after the target diameter reaches a second threshold a third plasma torch is used. In a further embodiment the spacing between the axes of rotation of the targets is widened as the target diameter increases. In a still further embodiment a single plasma torch includes movable concentric tubes within its coil to selectively operate as any of a plurality of different diameter plasma torches.

Multiple torch&mdash;multiple target method and apparatus for plasma outside chemical vapor deposition

A method and apparatus for making optical fiber preforms using simultaneous plasma deposition on the inside and outside surface of a starting tube. A starting tubular member is rotated, CFOT chemicals are selectively injected into the plasma torch, and CFIT chemicals are selectively injected to flow through the hollow of the tube. The plasma torch is traversed along the tubular member to simultaneously deposit soot on the inside and outside surface. The soot on one or both surfaces may be consolidated into a silica layer as it is deposited. The plasma torch is traversed again to deposit additional soot, and/or consolidate previously deposited soot, on one or both surfaces. The process is repeated until a predetermined amount of silica is formed on the tubular member. The tubular member is then collapsed. Optionally, additional plasma deposition is performed during or after the collapsing.

Method for making optical fiber preform using simultaneous inside and outside deposition

A method for producing an optical fiber preform starting with a first-generation target typically comprising pure silica. A plasma torch deposits an annular region of doped silica to form an intermediate structure. The intermediate structure is drawn down to a second-generation target and another annular region of doped silica is deposited. The process is repeated a plurality of times until an Nth generation target is formed. The deposition optionally employs repeated cycles of depositing a plurality of layers of silica at a high traversal rate without sintering, followed by periodic sintering. In a further embodiment, stabilizer bars extending out from the plasma coils improve distribution of the deposition material. Another embodiment injects the source gas into a particular region of the plasma for control of soot deposition.

Method of making an optical fiber preform via multiple plasma depositing and sintering steps

An apparatus and method for producing a tubular member, which is suitable for use as a starter tube or an optical fiber preform, on a rotating cylindrical target mounted on a lathe. The tubular member is made by means of plasma outside vapor deposition. In this process, a source gas comprising SiCl,and, optionally, a fluorine-laden chemical, is introduced into an air plasma. Both the air and the source gas are dry gases and have low hydroxyl content. The air plasma is created by a high-frequency induction plasma torch which travels along the length of the target on a carriage. The torch is provided with a short U-shaped gutter on either side of its rim directly beneath the target and the growing tubular member. This gutter helps channel reaction products of the source gas and the plasma so as to enhance deposition on the growing tubular member. The torch is further provided with an induction coil having a plurality of windings, the uppermost winding being maintained a predetermined distance from the surface of the tubular member as the latter is built up.

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Fallbrook, CA, United States of America

Dau Wu