Limitations to the Manufacture of Specialty Optical Fiber

[+] Author and Article Information
Geoffrey W. Barton

Department of Chemical Engineering, University of Sydney, Sydney, NSW 2006, Australiabarton@chem.eng.usyd.edu.au

Susan H. Law

Optical Fibre Technology Centre, University of Sydney, Sydney, NSW 2006, Australia

Thanh N. Phan

Department of Chemical Engineering and Optical Fibre Technology Centre, University of Sydney, Sydney, NSW 2006, Australia

J. Manuf. Sci. Eng 127(3), 663-669 (Apr 23, 2004) (7 pages) doi:10.1115/1.1954793 History: Received November 17, 2003; Revised April 23, 2004

There is an emerging demand for specialty fibers whose diameter variability is an order of magnitude less than current requirements. This study considers three potential impediments to producing such fibers: on-line measurement, control techniques, and furnace design. Existing laser-gage technology appears to be quite adequate provided suitable digital filtering is used, but it is unlikely that any controller would be able to eliminate the high-frequency diameter variability. The most likely source of these high-frequency variations are flow instabilities within the draw furnace. Thus, it would seem that furnace redesign is the key to providing the level of diameter control needed in emerging specialty optical fibers.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Schematic diagram of the fiber-drawing process

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Figure 2

Block diagram of the (simulated) feedback control scheme

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Figure 3

Effect of furnace temperature on fiber diameter deviation: Upper line: furnace temperature, Lower line: fiber diameter deviation

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Figure 4

Fiber diameter deviation responses to step changes in furnace temperature

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Figure 5

Comparison of simulated (open and closed-loop) and actual closed-loop responses

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Figure 6

Diameter distribution from on-line measurements

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Figure 7

Diameter distribution from off-line measurements

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Figure 8

Power spectral density for fiber diameter deviation data sampled at an effective rate of 64 Hz

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Figure 9

Effect of filter cutoff frequency on diameter deviation data sampled at an effective frequency of 64 Hz




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