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Low-degeneracy few-mode fiber

A technology of few-mode optical fiber and optical fiber, which is applied in the direction of cladding optical fiber, multi-core optical fiber, optical fiber, etc., can solve the problems of complex manufacturing technology, achieve good circular symmetry, increase the effective refractive index difference, and facilitate the effect of connection

Active Publication Date: 2014-04-02
JIANGYIN ZHICHANGHUI INTELLECTUAL PROPERTY OPERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its production technology is relatively complex

Method used

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  • Low-degeneracy few-mode fiber
  • Low-degeneracy few-mode fiber
  • Low-degeneracy few-mode fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Fiber cross-section as figure 1 shown. Main core diameter d m =20 μm, No. 1 auxiliary core diameter d a1 =6 μm, the refractive index difference between the core and the cladding is 0.01. At a wavelength of 1.55 μm, the mode field distribution is as follows image 3 As shown, the effective refractive index of the mode is as Figure 4 shown.

Embodiment 2

[0034] Fiber cross-section as figure 1 shown. Main core diameter d m =10 μm, No. 1 auxiliary core diameter d a1 =4μm, the refractive index difference between the core and the cladding is 0.004. In the wavelength range of 1.39~1.73 μm, the optical fiber is dual-mode transmission.

Embodiment 3

[0036] Fiber cross-section as Figure 5 shown. Main core diameter d m =10 μm, No. 1 auxiliary core diameter d a1 =4 μm, No. 2 auxiliary core diameter d a2 =3 μm, the refractive index difference between the core and the cladding is 0.004. In the wavelength range of 1.42-1.9 μm, the optical fiber is dual-mode transmission. Its mode field distribution is as Figure 6 As shown, it can be seen that the main energy of the fundamental mode is still concentrated in the main core, while its LP 11 The main energy of the Y mode is concentrated in the auxiliary core.

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Abstract

The invention provides a low-degeneracy few-mode fiber, which comprises a fiber core and a cladding. The fiber core consists of a main fiber core and 2N auxiliary fiber cores; the main fiber core is located in the center of the fiber; the 2N auxiliary fiber cores are symmetrically arranged at both sides of the main fiber core; the center of the main fiber core and the centers of the 2N auxiliary fiber cores are located on the same straight line; the main fiber core and the auxiliary fiber cores are the same in refractive index; the boundary of the main fiber core is tangential to the boundary of the adjacent auxiliary fiber cores; the boundaries of the two adjacent auxiliary fiber cores are tangential; the diameter of each auxiliary fiber core is smaller than that of the main fiber core, and the diameters the auxiliary fiber cores are decreased progressively from inside to outside. According to the low-degeneracy few-mode fiber provided by the invention, by introducing the auxiliary fiber cores, the circular symmetry of the refractive index distribution of the fiber is broken to form refractive index distribution with double symmetry. Through the refractive index distribution with the double symmetry, a high-order mode with fourfold degeneracy drops to a twofold-degeneracy mode, and therefore, the effective refractive index difference of the main fiber core and the auxiliary fiber cores is increased, and the mode field distribution form of the high-order mode is fixed.

Description

technical field [0001] The invention relates to the field of optical fiber communication, and is specifically divided into a few-mode optical fiber capable of reducing mode degeneracy. Background technique [0002] The fundamental mode of an ordinary fiber consists of two degenerate linearly polarized modes. The high-order mode of the fiber is composed of two or four degenerate modes according to its symmetry and degeneracy, such as LP 11 Die, LP 21 Each module consists of four degenerate modules, while LP 02 The mode consists of two linearly polarized modes. For a higher-order mode composed of four degenerate modes, each linear polarization state consists of two modes. The mode field distributions of these two modes are different, while the transmission constants are the same. During the transmission process, the two modes will be coupled due to the change of the refractive index distribution of the fiber and the influence of the external environment, and the energy of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02042G02B6/3885H01S3/06737
Inventor 陈明阳
Owner JIANGYIN ZHICHANGHUI INTELLECTUAL PROPERTY OPERATION CO LTD
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