Method for producing and processing a preform, preform and optical fiber

The method for producing and processing a preform (1p, 1s) comprises a preliminary process phase, in which silica grain (5a; 5b) is supplied into the interior space (110) of a silica tube (11) having an open upper end and a closed lower end (111), in order to obtain an unprocessed preform (1p, 1s ),...

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Bibliographic Details
Main Authors SANDOZ, FREDERIC, RIBAUX, PHILIPPE, HAMEL, PHILIPPE, PEDRIDO, CARLOS
Format Patent
LanguageEnglish
Published 25.08.2011
Subjects
CHEMISTRY
GLASS
MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
METALLURGY
MINERAL OR SLAG WOOL
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Summary:The method for producing and processing a preform (1p, 1s) comprises a preliminary process phase, in which silica grain (5a; 5b) is supplied into the interior space (110) of a silica tube (11) having an open upper end and a closed lower end (111), in order to obtain an unprocessed preform (1p, 1s ), and comprises a final process phase, in which the interior space (110) of the silica tube (11) is closed, a condition of reduced pressure is generated, the unprocessed preform (1p, 1s ) is heated with a final process temperature in order to fuse the silica tube (11) and the silica grain (5b). According to the invention the silica grain (5a; 5b) entering the interior space (110) is thermally treated during the preliminary process phase with an intermediate process temperature that lies under the melting point of the silica grain.
Bibliography:Application Number: AU20100215384