A low-attenuation bend-insensitive single-mode fiber

A bend-insensitive, single-mode fiber technology, used in clad fibers, multi-layer core/clad fibers, graded-index core/clad fibers, etc. Difficulty, manufacturing cost, low refractive index of the sunken cladding, etc., to achieve the effects of low fiber attenuation, reduced germanium doping in the core, and large effective area

Active Publication Date: 2018-10-09
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Problems solved by technology

However, in these patents, the refractive index of the depressed cladding is very low, and the amount of fluorine doped is relatively large, which will increase the difficulty of process control and manufacturing cost

Method used

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  • A low-attenuation bend-insensitive single-mode fiber
  • A low-attenuation bend-insensitive single-mode fiber
  • A low-attenuation bend-insensitive single-mode fiber

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with embodiments.

[0040] The optical fiber of this embodiment includes a core layer and a cladding layer. The refractive index of the core layer is distributed in a parabolic shape of order α, and the distribution index α is 1.7 to 2.3. The cladding layer is an inner cladding layer and a middle cladding layer from the inside to the outside. For the cladding layer and the outer cladding layer, the relative refractive index difference Δ(r) of the parabolic core layer and the radius r are related as follows: Δ(r)=-Δ1[(r / R1) α -1], where r is the distance between a certain point of the core layer and the core center, Δ1 is the maximum relative refractive index difference of the parabolic core layer, and R1 is the core layer radius. The relative refractive index difference of the inner cladding is Δ2, and the radius of the inner cladding is R2; the relative refractive index difference of the interme...

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Abstract

The invention relates to a low-attenuation bending insensitive single-mode optical fiber for an optical communication transmission system. The optical fiber comprises a core layer and a cladding layer. The optical fiber is characterized in that the refractive index of the core layer is distributed according to an alpha-order parabola, and the distribution index alpha is 1.5-9.0; the cladding layer is sequentially formed by an inner cladding layer, an intermediate cladding layer and an outer cladding layer from inside to outside; the maximal refractive index difference delta 1 of the parabola core layer is 0.25-0.45 percent, and the radius R1 of the core layer is 5.0-7.0mu u; the relative refractive index different delta 2 of the inner cladding layer is -0.20-0 percent, and the radius R2 of the inner cladding layer is 7.0-10.0mu m; the relative refractive index difference delta 3 of the intermediate cladding layer is -0.20-0 percent, and the radius R3 of the intermediate cladding layer is 10.0-20.0mu m; and the outer cladding layer is a pure quartz glass layer. The low-attenuation bending insensitive single-mode optical fiber has reasonable refractive index section design and low doping amount, and has excellent attenuation resistance and bending resistance.

Description

Technical field [0001] The present invention relates to a low-attenuation bend-insensitive single-mode fiber used in optical communication transmission systems. Its attenuation performance is better than that of conventional G.652D fiber, and its macrobending loss meets the G.657A1 standard, and can be completely compatible with G.652D fiber. Compatible, belongs to the field of optical fiber communication technology. Background technique [0002] Optical fiber communication has the characteristics of large transmission capacity, long transmission distance, and fast transmission speed. It is widely used in optical communication networks such as long-distance backbone networks, metropolitan area networks, and access networks. Single-mode fiber that meets the ITU-T G.652D standard is the most commonly used communication fiber. On the one hand, with the continuous development of FTTx, fiber to the home in many cases will face complex construction environments in the corridor, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/028G02B6/036
CPCG02B6/0285G02B6/0365
Inventor 陈刚朱继红龙胜亚王瑞春拉吉·马泰邱文斌艾靓
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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