Method of producing internally coated glass tubes for the drawing of fibre optic light conductors
First Claim
1. A method of producing internally coated glass tubes for drawing fiber optic light conductors which consists of a core and a jacket of glasses which have a mutually different refractive index, comprising the steps of introducing into a glass tube surrounded by a resonator a reactive gas mixture consisting of SiCl4 and oxygen at a pressure of about 1 to 100 Torr, adding GeCl4 to the gas mixture, moving the tube relative to the resonator to form a non-isothermal plasma zone within the tube, and heating the tube to a temperature between 800°
- C.-1200°
C. to form a coating free of soot-like particles and consisting of a plurality of layers of SiO2 doped with an increasing content of GeO2.
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Abstract
In the reactive deposition of the core material from a gas which is passed through the tube onto the inner wall of the tube by means of a plasma zone, while a relative motion is effected in the axial direction between the tube and a plasma-producing device, the rate of precipitation is increased without impairing the quality of the core material coat, the reactive deposition being effected at a pressure of from 1 to 100 Torr and a temperature zone being superimposed on the plasma zone.
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Citations
3 Claims
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1. A method of producing internally coated glass tubes for drawing fiber optic light conductors which consists of a core and a jacket of glasses which have a mutually different refractive index, comprising the steps of introducing into a glass tube surrounded by a resonator a reactive gas mixture consisting of SiCl4 and oxygen at a pressure of about 1 to 100 Torr, adding GeCl4 to the gas mixture, moving the tube relative to the resonator to form a non-isothermal plasma zone within the tube, and heating the tube to a temperature between 800°
- C.-1200°
C. to form a coating free of soot-like particles and consisting of a plurality of layers of SiO2 doped with an increasing content of GeO2. - View Dependent Claims (2, 3)
- C.-1200°
Specification
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- Resources
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Current AssigneePlasma Optical Fibre BV (Prysmian SPA)
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Original AssigneeDieter Kuppers, Hans Lydtin, Ludwig Rehder
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InventorsLydtin, Hans, Kuppers, Dieter, Rehder, Ludwig
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Primary Examiner(s)Smith, Ronald H.
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Assistant Examiner(s)Page, Thurman K.
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Application NumberUS05/852,068Time in Patent Office489 DaysField of Search427/38, 427/39, 427/167, 427/163, 427/237, 427/255, 65/3 R, 65/3 A, 350/96 WG, 138/145, 138/177, 204/164US Class Current427/575CPC Class CodesC03B 37/0183 for plasma within a tube su...
