Title:
PRODUCTION OF OPTICAL FIBER PREFORM
Document Type and Number:
Japanese Patent JPH01111747
Kind Code:
A
Abstract:
PURPOSE:To obtain the above preform capable of providing an optical fiber having less residual OH groups and with a low loss by carrying out the deposition of fine glass particles under specified conditions in the production of the preform wherein the fine glass particles are deposited on the outer periphery of a core rod, dehydrated, and vitrified. CONSTITUTION:The core rod is moved at a high velocity of 400-600mm/hr in parallel with a fine glass particle synthesizing burner, the interface temp. of the core rod is kept at a low temp. of 600-650 deg.C, and the fine glass particles generated from the burner are deposited on the rod. The process is repeated several times until a deposit having a thickness by which the ratio of the outer diameter of the soot to the outer diameter of the core rod is controlled to 2.5-5.0 is obtained. The product is then dehydrated, sintered, and vitrified to obtain the above preform.
Inventors:
OKANO HIROAKI
OSONO KAZUMASA
MURAKAMI KAZUYA
KOBAYASHI MASAYOSHI
OKUBO TAKESHI
OSONO KAZUMASA
MURAKAMI KAZUYA
KOBAYASHI MASAYOSHI
OKUBO TAKESHI
Application Number:
JP26651387A
Publication Date:
April 28, 1989
Filing Date:
October 23, 1987
Export Citation:
Assignee:
HITACHI CABLE
International Classes:
G02B6/00; C03B37/014; C03B37/018; (IPC1-7): C03B37/018; G02B6/00
Attorney, Agent or Firm:
Nobuo Kinutani
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