Drawing tower

Fiber disposal, viscose process and, 11 279 Fiber draw tower, 11 143 Fiber drum and can packaging, converting, 18 22... 

Figure 1 Schematic of an optical fiber drawing tower. GPa...

As shown in the multimedia CD-ROM that accompanies this book (see HYSYS Tutorials Process Design —> Multi-draw Tower Optimization and ASPEN —> Tutorials —> Process Design — Multi-draw Tower Optimization), the solution of this NLP requires care, since the gradient-based SQP method is sen-... 

Figure 3.6 Fused-silica drawing tower. (Courtesy of SGE Analyticai Sciences.)...

FBG sensors produced on-line during the process using an excimer laser pulse suffer no measurable loss of strength relative to unirradiated fibre. This emphasizes the fact that it is favourable to use draw-tower FBGs as sensor elements to overcome the problem related to fibre stripping and high fluence UV irradiation. 

Askins C C, Putnam M A, Williams G M and Friebele E J, Stepped-wavelength optical-fibre Bragg grating arrays fabricated in line on a draw tower . Opt. Lett., 1994,14, 823-4. 

Hagemann V, Trutzel M N, Staudigel L, Rothhardt M, Muller H-R and Krumpholz O, Mechanical resistance of draw-tower-Bragg grating sensors . Electron. Lett., 1998, 34(2), 211-12. 

FIGURE 6.46 Schematic representation of a draw tower for high-silica preforms. (From A. J. Bruce, Ref. 10.)... 

Step 6— Testing. Often the coated fiber is continuously proof-tested for strength on the draw tower or as it is rewound onto other spools. Optical testing is also critically important. For multimode fibers the tests include attenuation, bandwidth, numerical aperture, and core diameter for single mode they include such additional characteristics as chromatic dispersion, cutoff wavelength, and mode field diameter. 

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