Title :
Inner pressure control method in optical fiber preform fabrication by vapor-phase axial deposition
Author :
Imoto, Katsuyuki ; Sumi, Masao
Author_Institution :
Hitachi Ltd., Tokyo, Japan
fDate :
4/1/1988 12:00:00 AM
Abstract :
A method to control inner pressure variation in a vapor-phase axial-deposition (VAD) apparatus is developed. It uses a flame-detection technology to explain temperature fluctuations. Primary causes of the inner pressure fluctuations are analyzed, and suppression techniques are described. They include the adoption of a large buffer-tank and bias gas addition. An inner pressure-feedback control mechanism operates by adjusting the bias gas flow, keeping fluctuations of the inner pressure to less than half of that with no control
Keywords :
optical fibres; optical workshop techniques; VAD; bias gas addition; buffer-tank; flame-detection technology; inner pressure variation; optical fiber preform fabrication; pressure-feedback control mechanism; temperature fluctuations; vapor-phase axial deposition; Fires; Fluctuations; Fluid flow; Glass; Optical device fabrication; Optical fibers; Preforms; Pressure control; Refractive index; Stability;
Journal_Title :
Lightwave Technology, Journal of
