Method of controlling the etching and collapse of an MCVD tube b

Details Method of controlling the etching and collapse of an MCVD tube b Method of controlling the etching and collapse of an MCVD tube b

1999-03-22

2000-10-17

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

With measuring, controlling, sensing, programming, timing,...

65379, 65419, 65429, C03B 37018, C03B 3707

Patent

active

061314137

ABSTRACT:
In a method of shrinking a tubular optical fiber preform with a doped silica core the preform is placed on a glassmaking lathe to rotate it about an axis, a torch is moved parallel to the axis in front of the preform to shrink it and collapse it in a number of passes, and during an etching pass a mixture of oxygen and a fluorine precursor gas is injected through one end of the incompletely collapsed preform to eliminate a certain layer from the core. During the etching pass, a certain value of the pressure of the gaseous mixture at the end of the preform is determined and the speed of the torch is slaved to this pressure value. Controlling the speed of the torch stabilizes the pressure of the gaseous mixture inside the preform, which longitudinally homogenizes the diameter of the core and the refractive index difference relative to an optical cladding around the core.

REFERENCES:
patent: 4199335 (1980-04-01), Gliemeroth
patent: 4793843 (1988-12-01), Pluijms

Affiliated with

Also associated with

Rating

Method of controlling the etching and collapse of an MCVD tube b does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of controlling the etching and collapse of an MCVD tube b, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling the etching and collapse of an MCVD tube b will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-457839