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Optical fiber for fiber bragg grating

An optical fiber, optical axis technology, applied in the direction of grating fiber, cladding fiber, optical waveguide light guide, etc.

Inactive Publication Date: 2016-04-27
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most suitable composition of optical fibers is unknown from the viewpoint of filter characteristics (basic loss, peak wavelength shift, and change in half-value width of transmission spectrum due to refractive index modulation) and processing time for filter formation , because it is not disclosed in Patent Document 1

Method used

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  • Optical fiber for fiber bragg grating
  • Optical fiber for fiber bragg grating
  • Optical fiber for fiber bragg grating

Examples

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Embodiment Construction

[0023] Hereinafter, the preferred embodiments for implementing the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same symbols are used to denote the same elements, and repeated descriptions are omitted. The present invention is not limited to these embodiments, and the scope of the present invention is intended to be understood by the claims and their equivalents so as to include all modifications of these embodiments.

[0024] figure 1 It is a schematic diagram showing a cross section of the optical fiber 1 according to the embodiment of the present invention. The optical fiber 1 made of silicon-based glass includes: a core region 11, which includes the center of the optical axis; an optical cladding region 12, which is arranged around the core region 11; and a sheath region 13, which is arranged around the optical cladding region 12 . Core region 11 can contain Cl but not GeO 2 , It is not se...

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Abstract

An optical fiber having a composition that is most suitable from the viewpoint of filter formation time and filter properties of slanted fiber grating (SFG) is provided. An optical fiber made of silica-based glass comprises a core region, which does not contain GeO2 and includes the optical axis, and a cladding region formed around the core region. The cladding region has a refractive index smaller than that of the core region and contains GeO2 of 6.8 wt % or more. SFG made with the optical fiber enables base loss of 2 dB or less, peak wavelength shift of 1.2 nm or less, and change of 0.2 nm or less in width at half maximum.

Description

Technical field [0001] The invention relates to an optical fiber suitable for fiber Bragg grating. Background technique [0002] International Publication No. 2003 / 093887 (Patent Document 1) discloses a fiber Bragg grating having refractive index modulation in a predetermined range along the optical axis of the optical fiber and an optical fiber suitable for forming such refractive index modulation. The fiber Bragg grating disclosed in Patent Document 1 is a tilted fiber grating (SFG) in which the period length of the refractive index modulation is several hundred nanometers, and the grating surface is inclined with respect to the cross section perpendicular to the optical axis of the optical fiber. For example, this SFG is used as a gain equalization filter for flattening the gain spectrum of an erbium-doped fiber amplifier (EDFA). [0003] The optical fiber disclosed in Patent Document 1 is made of silicon-based glass, and includes a core region having an optical axis center and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02114G02B6/03627G02B6/02076G02B6/0208
Inventor 永岛拓志长能重博
Owner SUMITOMO ELECTRIC IND LTD
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