Optical waveguides – Optical fiber waveguide with cladding
Reexamination Certificate
2006-12-26
2006-12-26
Wood, Kevin S. (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
C385S127000
Reexamination Certificate
active
07155098
ABSTRACT:
Disclosed is a method of manufacturing an optical fiber perform using MCVD including dehydration and dechlorination, which executes the following process repeatedly with changing the composition of soot generation gas according to the refractive index profile, the process including the steps of: forming a soot layer having pores on an inner wall of a deposition tube at a temperature lower than the soot sintering temperature with putting soot generation gas and oxygen gas into the rotating deposition tube; removing hydroxyl groups with keeping the pores by putting dehydration gas into the deposition tube; removing chlorine impurities existing in the soot layer with keeping the pores by putting dehydration gas into the deposition tube; and sintering the soot layer by heating the deposition tube at a temperature over the soot sintering temperature.
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Jang Ki-Wan
Lee Chan-Joo
Park Lae-Hyuk
Day Jones
L.G. Cable Ltd.
Wood Kevin S.
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