Method for lowering index of refraction of glass surfaces
First Claim
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1. A METHOD FOR PREPARING AN OPTICAL FIBER WHICH COMPRISES TREATING A SUBSTANTIALLY PRE FUSED SILICA FIBER HAVING A THICKNESS FROM ABOUT 250,000 TO 750,000 ANGSTROM UNITS WITH AN AQUEOUS CHLORIDE SOLUTION SELECTED FROM THE GROUP OF ALKALI AND EARTH ALKALI CHLORIDES IN ADMIXTURE WITH A WETTING AGENT, DRYING THE TREATED FIBER TO FORM A CHLORIDE COATING ON THE FIBER SURFACE, AND FIRING THE COATED FIBER AT A TEMPERATURE SUFFICIENT TO CAUSE IN SITU REACTION OF THE CHLORIDE COATING WITH THE PURE SILICA FIBER TO A DEPTH OF ABOUT 3,000 TO 4,000 ANGSTROM FOR PRODUCING A GLASS LAYER HAVING AN INDEX OF REFRACTION DIFFERENT FROM PURE SILICA.
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6 Claims
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1. A METHOD FOR PREPARING AN OPTICAL FIBER WHICH COMPRISES TREATING A SUBSTANTIALLY PRE FUSED SILICA FIBER HAVING A THICKNESS FROM ABOUT 250,000 TO 750,000 ANGSTROM UNITS WITH AN AQUEOUS CHLORIDE SOLUTION SELECTED FROM THE GROUP OF ALKALI AND EARTH ALKALI CHLORIDES IN ADMIXTURE WITH A WETTING AGENT, DRYING THE TREATED FIBER TO FORM A CHLORIDE COATING ON THE FIBER SURFACE, AND FIRING THE COATED FIBER AT A TEMPERATURE SUFFICIENT TO CAUSE IN SITU REACTION OF THE CHLORIDE COATING WITH THE PURE SILICA FIBER TO A DEPTH OF ABOUT 3,000 TO 4,000 ANGSTROM FOR PRODUCING A GLASS LAYER HAVING AN INDEX OF REFRACTION DIFFERENT FROM PURE SILICA.
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6. AN OPTICAL FIBER PREPARED IN ACCORDANCE WITH THE METHOD SET FORTH IN CLAIM 1.
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Current AssigneeSchulz, Werner P.
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Original AssigneeSchulz, Werner P.
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InventorsSchulz, Werner P.
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Application NumberUS04/298,980Time in Patent Office1,385 DaysField of SearchUS Class Current385/123CPC Class CodesC03C 25/1061 Inorganic coatingsY10T 428/2964 Artificial fiber or filamentY10T 428/298 Physical dimension
