Method for building up plasma on an optical fiber preform, while reducing nitrogen oxides
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United States of America Patent
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Dec 8, 2009
Grant Date -
Jun 10, 2004
app pub date -
Dec 2, 2003
filing date -
Dec 2, 2002
priority date (Note) -
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Abstract
A plasma buildup method for building up an optical fiber perform. The method includes the steps of: providing a plasma torch having an outlet nozzle adjacent to a primary perform, wherein an interaction zone is defined between the outlet nozzle and the primary preform; feeding the plasma torch with a plasma-generating gas in the presence of a silica-based material so as to deposit a buildup material on the primary preform; and introducing a reducing element into the interaction zone, the reducing element reacting to induce reduction of the nitrogen oxides produced by interaction between nitrogen and oxygen in the presence of the plasma generated by the torch.
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