Title:
【発明の名称】光ファイバ・プリフォームの作成方法
Document Type and Number:
Japanese Patent JP2685543
Kind Code:
B2
Abstract:
A method is disclosed for making a step-index optical fiber having a steep refractive index gradient between core and cladding. Core glass particles comprising a base glass and a refractive index-increasing dopant are deposited on a mandrel (20). The mandrel is removed and the resultant soot preform is consolidated to form a core preform (40) having a dopant-poor surface region. The core glass preform is stretched and the hole therein is closed to form a core bait rod. Cladding glass soot is deposited on the core bait rod at a density which is at least 0.5 g/cc. This is accomplished by directing the flame from an auxiliary burner (66) onto the core bait rod immediately prior to the deposition of cladding soot thereon. The resultant preform is consolidated and drawn into an optical fiber. In another embodiment, the etched core preform is overclad with a layer of cladding glass, and the composite preform is stretched prior to applying a second overclad layer.
Inventors:
John William Gililand
Application Number:
JP28266088A
Publication Date:
December 03, 1997
Filing Date:
November 10, 1988
Export Citation:
Assignee:
Corning Incorporated
International Classes:
G02B6/00; C03B37/014; C03B37/018; (IPC1-7): C03B37/014; C03B19/14; C03B37/018; G02B6/00
Attorney, Agent or Firm:
Fujihiko Motohiko