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Inner pressure control method in optical fiber preform fabrication by vapor-phase axial deposition

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2 Author(s)
Imoto, K. ; Hitachi Ltd., Tokyo, Japan ; Sumi, M.

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

Published in:

Lightwave Technology, Journal of  (Volume:6 ,  Issue: 4 )

Date of Publication:

Apr 1988

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