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R.F. induction furnace for silica-fibre drawing

R.F. induction furnace for silica-fibre drawing

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© The Institution of Electrical Engineers
Published

An r.f. induction furnace is described to be used in a standard-type machine for drawing silica fibres for optical communication. The furnace consists of a small induction-heated graphite element which is fitted in a ‘concentrator’ (stepdown transformer) placed directly in the tank coil of the r.f. generator, thus allowing one to maximise the matching efficiency between the generator and the heating element. The small dimensions of the graphite element make the furnace quickly responsive to input-power variations, so that it can be brought to a maximum temperature of 2180 K in 10 s. An argon atmosphere and an additional argon laminar flow are provided to avoid fibre contamination by the sublimated graphite, as well as to preserve the graphite susceptor. Successful tests of furnace operation have been carried out.

Inspec keywords: electric furnaces; induction heating; optical waveguides; fibre optics

Other keywords: Ar atmosphere; stepdown transformer; induction heated graphite element; silica fibre drawing; RF induction furnace; concentrator; optical communication

Subjects: Power applications in chemical and oil refining industries; Chemical industry; Fibre optics; Optoelectronics manufacturing; Electric heating; Fibre optics and fibre waveguides

References

    1. 1)
      • D.N. Payne , W.A. Gambling . A resistance-heated high temperature furnace for drawing silica-based fibers for optical communications. Bull. Am. Ceram. Soc.
    2. 2)
      • Blyler, L.L., Hart, A.C., Jaeger, R.E., Kaiser, P.: `Low-loss, polymer-clad silica fibers produced by laser drawing', TuA5 1–3, Topical meeting on optical transmission, 1975, Williamsburg.
    3. 3)
      • B. Scott , H. Rawson . Preparation of low-loss glasses for optical fibre communication systems. Opto-Electron. , 285 - 288
    4. 4)
      • D. Kato . Fused-silica-core fiber as a low-loss optical waveguide. Appl. Phys. Lett. , 3 - 4
    5. 5)
      • U.C. Pack . Laser drawing of optical fibers. Appl. Opt. , 1383 - 1386
    6. 6)
      • W.G. Frenchs , A.D. Pearson , G.W. Tasker , J.B. Macchesney . Low-loss fused silica optical waveguide with borosilicate cladding. Appl. Phys. Lett. , 338 - 339
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