Method of producing optical fibers
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United States of America Patent
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Feb 9, 1982
Grant Date -
N/A
app pub date -
Jul 16, 1980
filing date -
Jul 19, 1979
priority date (Note) -
Expired
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Abstract
Doped silica glass is deposited by means of reactive deposition from the gas phase by the action of a nonisothermal plasma, on the inside of a quartz glass tube. The coated tube is collapsed and the preform thus obtained is drawn into an optical fiber. During the deposition procedure the tube inside diameter between 6 and 30 mm must satisfy the formula (M/A.sub.I) 1/3.58.times.1 mm.ltoreq.d wherein M is the deposition rate of doped quartz glass in grams per minute and A.sub.I has the value 1.42.times.10.sup.-4 g/min. At the end of the deposition, prior to collapsing, the inside diameter must satisfy the equation (M/A.sub.II) 1/3.04.times.1 mm.gtoreq.d A.sub.II having the value 6.63.times.10.sup.-5 g/min.
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