Method of manufacturing optical fiber preform

  • US 5,352,259 A
  • Filed: 01/28/1993
  • Issued: 10/04/1994
  • Est. Priority Date: 01/30/1992
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing an optical fiber preform, comprising the steps of:

  • disposing a rod member made of a silica-based material within a cavity of a mold, followed by loading a molding material within the mold cavity;

    pressuring the mold from outside of the mold to form a porous layer on the surface of the rod member and, thus, to obtain a porous preform;

    wherein at least one end portion of the rod member extends outside the mold cavity in the step of pressurizing the mold;

    mechanically taking the porous preform out of the mold by pressuring an end portion of the rod member; and

    applying pressure to one end of the rod member while applying a withdrawing force to another end portion of the rod member in the step of taking the porous preform out of the mold.

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