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Optical fiber and optical fiber coupler, erbium-doped optical fiber amplifier, and optical waveguide using the same

An optical fiber coupler and erbium-doped fiber technology, which are applied in the coupling of optical waveguides, optical waveguide light guides, multi-layer core/clad fibers, etc., can solve the problems of inconsistent MFD and low connection loss.

Inactive Publication Date: 2007-11-07
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if the diffusion coefficient of the fiber forming the fiber coupler is simply made larger than that of the erbium-doped fiber, even if the heating time is changed, the MFD of the fiber coupler and the erbium-doped fiber will not match, and a connection with low connection loss may not be possible. question

Method used

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  • Optical fiber and optical fiber coupler, erbium-doped optical fiber amplifier, and optical waveguide using the same
  • Optical fiber and optical fiber coupler, erbium-doped optical fiber amplifier, and optical waveguide using the same
  • Optical fiber and optical fiber coupler, erbium-doped optical fiber amplifier, and optical waveguide using the same

Examples

Experimental program
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Embodiment 1

[0084] Fig. 1 is a schematic diagram showing a part of an erbium-doped fiber amplifier.

[0085] The erbium-doped fiber amplifier of this example generally consists of an erbium-doped fiber 11; a fiber coupler 12 formed by fusion splicing of fibers 14 and 14;

[0086] As shown in FIG. 1 , in the erbium-doped fiber amplifier of this example, a fiber coupler 12 , an erbium-doped fiber 11 and a single-mode fiber 13 are connected by a fusion splice 16 . The connection loss and connection strength of the optical fiber coupler 12 are the same as those of the optical fibers 14, 14 forming it. Here, as the optical fibers 14 and 14 forming the optical fiber coupler 12, the optical fiber of the present invention and the conventional optical fiber with a high number of apertures were prepared, and the optical fiber coupler 12 composed of two optical fibers of the present invention and two conventional optical fibers with a high aperture were prepared. A fiber coupler 12 composed of opti...

Embodiment 2

[0109] For the optical fiber having the structure shown in FIG. 2( a ), three types of optical fibers having different inner cladding diameters were prepared. The inner cladding diameters were set to 10 μm, 20 μm, and 40 μm, respectively.

[0110] As shown in Figure 2 (a), the optical fiber of the present invention is an optical fiber in which the outer circumference of the core is surrounded by a cladding with a refractive index smaller than the core, and the cladding is a combination of an inner cladding and an outer cladding with different compositions. 2-tier structure.

[0111] The core is made of quartz-based glass (SiO) doped with germanium (Ge) and fluorine (F). 2 / GeO 2 / F), and the content of the dopant was 12% by mass of germanium and 0.2% by mass of fluorine.

[0112] The inner cladding is made of quartz-based glass (SiO) with germanium, phosphorus (P) and fluorine 2 / GeO 2 / P 2 o 5 / F) is formed, and the dopant content is set to be about 1% by mass of germa...

Embodiment 3

[0126] For the optical fiber having the structure shown in FIG. 2( a ), three types of optical fibers A, B, and C having different dopant contents in the inner cladding were prepared.

[0127] The inner cladding of fiber A is made of quartz-based glass (SiO 2 / GeO 2 / P 2 o 5 / F), and the dopant content was set to 0.2% by mass of germanium, 0.5% by mass of phosphorus, and 0.1% by mass of fluorine.

[0128] The inner cladding of fiber B is made of quartz-based glass (SiO 2 / GeO 2 / P 2 o 5 / F) is formed, and the dopant content is set to be about 1% by mass of germanium, about 1% by mass of phosphorus, and about 0.5% by mass of fluorine.

[0129] The inner cladding of optical fiber C is made of quartz-based glass (SiO 2 / GeO 2 / P 2 o 5 / F) was formed, and the content of the dopant was 1.5% by mass of germanium, 1.5% by mass of phosphorus, and 1.0% by mass of fluorine.

[0130] Except for the dopant concentration of the inner cladding layer, it is the same as in Example...

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Abstract

An optical fiber comprising a core of quartz glass containing at least germanium, provided at the center of optical fiber, an inside cladding of high diffusion coefficient provided coaxially with the core around the core and an outside cladding of low diffusion coefficient provided around the inside cladding, wherein the core contains germanium in a concentration of about 200% or more of that of the inside cladding to thereby enable connection to an optical fiber of different MFD, such as a single mode optical fiber or an erbium-loaded optical fiber, with low connection loss and with satisfactory connection strength.

Description

technical field [0001] The present invention relates to an optical fiber constituting an optical component used in optical communication, an optical fiber coupler using the optical fiber, an erbium-doped optical fiber amplifier, and an optical waveguide, and particularly relates to a method for fusion splicing with optical fibers having different mode field diameters with low connection loss. And sufficient connection strength to connect the optical fiber and the optical fiber coupler, the erbium-doped optical fiber amplifier and the optical waveguide using the optical fiber. [0002] This specification is based on a Japanese patent application (Japanese Patent Application No. 2002-199959), and the contents described in this Japanese application are incorporated as part of this specification. Background technique [0003] When splicing optical fibers with different mode field diameters (hereinafter referred to as "MFD"), connection loss occurs. A known method for reducing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/10H01S3/067G02B6/024G02B6/036G02B6/255
CPCC03B2201/02C03B2201/31G02B6/03694C03B2201/12G02B6/2551C03B2201/28C03C3/04H01S3/06716C03C13/04C03B2203/30C03B2203/23
Inventor 池田正司中山真一姬野邦治大塚正明大桥正和田中大一郎
Owner THE FUJIKURA CABLE WORKS LTD
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