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a multilayer optical fiber

An optical fiber and fiber core technology, applied in the field of non-single-mode fiber, can solve the problems of low bending loss and single-mode fiber matching to be improved, and achieve the effect of reducing coupling, low connection loss, and maintaining matching.

Inactive Publication Date: 2017-02-08
INFORMATION & COMMNUNICATION BRANCH STATE GRID JIANGXI ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its bending loss is still not low enough, and the matching with single-mode fiber needs to be improved

Method used

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  • a multilayer optical fiber
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  • a multilayer optical fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Fiber structure such as figure 1 As shown, its radial refractive index distribution is as figure 2 shown. The refractive index difference n between the core 1, the inner cladding 2, the upper convex cladding 3, the lower concave cladding 4 and the outer cladding 5 1 -n 5 , n 2 -n 5 , n 3 -n 5 , n 4 -n 5 0.005, 0, 0.002, -0.007 respectively, the radius of core 1 and the radial width of inner cladding 2, upper convex cladding 3, and lower concave cladding 4 are respectively a 1 =4μm,a 2 =3μm,a 3 =2μm,a 4 =8μm. At a wavelength of 1.31 microns, its mode field diameter is 9.0 microns, and when the bending radius of the optical fiber is 7.5 mm, its bending loss is less than 0.1 dB / m. The connection loss with ordinary single-mode fiber is less than 0.05dB.

Embodiment 2

[0026] Fiber structure such as figure 1 As shown, its radial refractive index distribution is as figure 2 shown. The refractive index difference n between the core 1, the inner cladding 2, the upper convex cladding 3, the lower concave cladding 4) and the outer cladding 5 1 -n 5 , n 2 -n 5 , n 3 -n 5 , n 4 -n 5 0.0045, 0, 0.0025, -0.008 respectively, the radius of the core 1 and the radial width of the inner cladding 2, the upper convex cladding 3, and the lower concave cladding 4 are respectively a 1 =4.2μm,a 2 =3μm,a 3 =2μm,a 4 =9μm. At a wavelength of 1.31 microns, the mode field diameter is 9.5 microns. When the bending radius is 7.5mm, its bending loss is less than 0.05dB / m. When the bending radius of the optical fiber is 5mm, its bending loss is less than 0.005dB / turn.

[0027] The above optical fibers can be realized by the same manufacturing process as ordinary single-mode optical fibers.

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Abstract

The invention discloses a multi-layer optical fiber composed of five parts. The optical fiber sequentially comprises a fiber core, an inner cladding, an upper protruding cladding, a lower concave cladding and an outer cladding from inside to outside. The refractivity difference of the material meets the requirements that n1 minus n5 is larger than n3 minus n5, n3 minus n5 is larger than 0.001, n2 minus n5 is smaller than or equal to n4 minus n5, and n4 minus n5 is smaller than minus 0.002, wherein n1, n2, n3, n4 and n5 respectively indicates the refractivity of the fiber core, the refractivity of the inner cladding, the refractivity of the upper protruding cladding, the refractivity of the lower concave cladding and the refractivity of the outer cladding. By means of the lower concave cladding with the low refractivity, an optical fiber basic mode obtains light transmission with low bending loss. By means of the upper protruding cladding, a high-order mode is extended, and coupling between the basic mode and the high-order mode is reduced when the multi-layer optical fiber is connected with a single-mode optical fiber. By means of the inner cladding, matching between the optical fiber base mode and the single-mode optical fiber is kept, and low connection loss is achieved. Manufacturing process of the multi-layer optical fiber is the same as that of a common optical fiber, and mass production can be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a non-single-mode optical fiber with low bending loss characteristics. Background technique [0002] In fiber-to-the-home applications, the indoor optical fiber may need to be bent with a small arc at the corner of the wall and the bend of the pipe. If the fiber can be allowed to be bent to a smaller radius, it can also reduce the size of the fiber optic cable splice box and the fiber optic interface box used to store the fiber. Therefore, an ideal indoor fiber should have low bending loss at small bending radii. In addition to bending characteristics, the compatibility of optical fiber is also very important. The optical fiber used for fiber-to-the-home should be compatible with standard single-mode optical fiber, because the two ends of this optical fiber are usually connected with standard single-mode optical fiber, so as to realize the connection with the drop cabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036
Inventor 王华陈明阳祝远锋蔡志民李路明陈磊陈鹍陈健
Owner INFORMATION & COMMNUNICATION BRANCH STATE GRID JIANGXI ELECTRIC POWER CO