Optical fiber fabrication and resulting product

  • US 4,909,816 A
  • Filed: 07/26/1983
  • Issued: 03/20/1990
  • Est. Priority Date: 02/22/1974
  • Status: Expired due to Term
First Claim
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1. A method of making an optical fiber preform suitable for drawing into an optical fiber including the steps of:

  • providing a hollow glass tube of a first refractive index and having a predetermined length with a bore formed therethrough;

    introducing into said bore, in unreacted dry vapor form, material that forms a glass layer, coating said bore by thermally depositing said material thereon to form a glass layer of higher refractive index than the refractive index of said tube;

    rotating said glass tube about its longitudinal axis by a rotating device, while heating said coated tube to collapse said tube into a solid preform having substantially the same length as said predetermined length whereby the glass coating layer becomes a core of said higher index of refraction than the refractive index of said tube.

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