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Patent Searching and Data


Title:
PREFORM FOR OPTICAL FIBER AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2005247634
Kind Code:
A
Abstract:

To provide a preform which contains few OH group and is suitable for manufacturing an optical fiber for communication, having small transmission loss at a wavelength of 1,385 nm, and to provide a method for manufacturing the same.

In the method for manufacturing the preform for the optical fiber by heating and integrating a central rod and a plurality of tubes arranged around the rod. In the method, the outermost tube and a tube adjacent to the inside of the outermost tube are first heated and integrated, and sequentially heated integrated with the tube adjacent to the inside, and finally heated and integrated with the central rod. At the time of heating and integrating, the inner pressure of the inner side tube is controlled so that the diameter becomes constant after integrating. It is preferable to use an oxyhydrogen flame as the heat source.


Inventors:
OTSUSAKA TETSUYA
Application Number:
JP2004000060482
Publication Date:
September 15, 2005
Filing Date:
March 04, 2004
Export Citation:
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Assignee:
SHINETSU CHEMICAL CO
International Classes:
G02B6/00; C03B37/012; C03B37/014; C03B37/018; (IPC1-7): C03B37/012; C03B37/014; C03B37/018; G02B6/00
Attorney, Agent or Firm:
荒井 鐘司
河野 尚孝
嶋崎 英一郎