| US 7,469,559 B2 | ||
| Method for making low loss optical fiber | ||
| Laura J Ball, Fountaine le Port (France); Bruno P M Baney, Avon (France); Dana C Bookbinder, Corning, N.Y. (US); Keith L House, Corning, N.Y. (US); Rostislav R Khrapko, Moscow (Russian Federation); Susan L Schiefelbein, Ithaca, N.Y. (US); and Lisa A Moore, Corning, N.Y. (US) | ||
| Assigned to Corning Incorporated, Corning, N.Y. (US) | ||
| Filed on Dec. 02, 2004, as Appl. No. 11/4,027. | ||
| Application 11/004027 is a division of application No. 10/231865, filed on Aug. 28, 2002, abandoned. | ||
| Prior Publication US 2005/0223747 A1, Oct. 13, 2005 | ||
| Int. Cl. C03C 13/04 (2006.01) | ||
| U.S. Cl. 65—397 [65/427; 65/429] | 11 Claims |
| 1. A method of forming an optical fiber precursor, comprising:
providing a silica glass member;
depositing additional glass onto the silica glass member to form an optical fiber precursor, wherein the silica glass member
and the additional glass are essentially chlorine free;
heating an alkali metal material to form an alkali metal vapor;
exposing the optical fiber precursor to the alkali metal vapor, wherein the alkali metal vapor diffuses through a diffusion
surface of the optical fiber precursor to a diffusion depth of at least about 100 μm; and
etching the diffusion surface to a depth of at least about 5% of the diffusion depth.
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