OPTICAL FIBER FOR OPTICAL AMPLIFYING AND PRODUCTION METHOD THEREFOR

Title:

OPTICAL FIBER FOR OPTICAL AMPLIFYING AND PRODUCTION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2000/051213

Kind Code:

A1

Abstract:

An optical fiber for optical amplifying, provided with a structure for implementing flat gain characteristics or oscillation characteristics in wider wavelength bands, and a production method therefor. The optical fiber for optical amplifying is provided with a second dope region containing an optical axis center-containing first dope region and having an outer diameter larger than that of the first dope region. At least any one of Al¿2?O¿3?, P¿2?O¿5?, Y¿2?O¿3? and B¿2?O¿3? are added into the second dope region as oxides of elements having valences different from those of cations constituting the main materials of the above optical fiber. At least any of Er, Nd, Tm, Yb, Pr as rare earth elements, in addition to the above oxides, are added into the first dope region.

Inventors:

ENDO SHINJI (JP)
ISHIKAWA SHINJI (JP)
KAKUI MOTOKI (JP)
SUZUKI TOSHIMI (JP)

Application Number:

PCT/JP2000/001105

Publication Date:

August 31, 2000

Filing Date:

February 25, 2000

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)
ENDO SHINJI (JP)
ISHIKAWA SHINJI (JP)
KAKUI MOTOKI (JP)
SUZUKI TOSHIMI (JP)

International Classes:

H01S3/06; C03B37/012; C03B37/018; C03C13/04; G02B6/00; H01S3/067; H01S3/17; (IPC1-7): H01S3/067; G02B6/16

Foreign References:

JPH0529697A	1993-02-05
JPH07211980A	1995-08-11
JPH03228849A	1991-10-09
JPH03127032A	1991-05-30
EP0313209A1	1989-04-26
EP0896404A1	1999-02-10
US4959837A	1990-09-25

Other References: