METHOD FOR MANUFACTURING BASIC MATERIAL FOR OPTICAL FIBER

Title:

METHOD FOR MANUFACTURING BASIC MATERIAL FOR OPTICAL FIBER

Document Type and Number:

WIPO Patent Application WO/1987/007593

Kind Code:

A1

Abstract:

The basic material for optical fiber is manufactured by preparing a tubular glass body having a distribution of refractive indexes formed axisymmetrically around its center axis, preparing separately a columnar body having a distribution of refractive indexes formed symmetrically around its center axis by the VAD method, forming said columnar body by drawing into an elongated bar having a diameter of a predetermined size, inserting thereafter said elongated bar into said tubular glass to be fused therewith, forming thereby an integrated body. From said basic material for optical fiber manufactured as described above, an optical fiber having a distribution of refractive indexes of high accuracy and causing zero dispersion in a band of 1.5 mum can be manufactured. According to this manufacturing method, an optical fiber having a complex distribution pattern of refractive indexes can be easily manufactured.

Inventors:

TANAKA GOTARO (JP)
YOKOTA HIROSHI (JP)
TANAKA SHIGERU (JP)
KANAMORI HIROO (JP)
SUGANUMA HIROSHI (JP)

Application Number:

PCT/JP1987/000088

Publication Date:

December 17, 1987

Filing Date:

February 12, 1987

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)

International Classes:

C03B20/00; C03B37/012; C03B37/014; G02B6/00; G02B6/036; (IPC1-7): C03B37/012; C03B20/00; G02B6/00

Foreign References:

JPS603020B2

1985-01-25

Other References: