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A slope-type refractive index distribution multi-core fiber with low crosstalk between cores

A technology of refractive index distribution and multi-core optical fiber, which is applied in the direction of graded index core/cladding optical fiber, multi-core optical fiber, cladding optical fiber, etc., which can solve the problem of reducing the optical signal binding ability and information transmission ability in the fiber core , core multiplexing factor increase and other issues, to achieve the effect of small crosstalk between cores, improve communication quality, and weak core coupling

Active Publication Date: 2021-07-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crosstalk suppression currently used mainly includes air hole-assisted multi-core fiber and groove-assisted multi-core fiber. In theory, in order to reduce crosstalk, the core spacing should be as large as possible. If the cladding increases at the same time, the core density will decrease. If the cladding diameter is small, the multiplexing factor of the core increases, thereby reducing the information transmission capability; if the cladding diameter remains unchanged, increasing the core spacing without restriction will cause the cladding of the surrounding core to be too thin, reducing the optical signal in the core. Binding ability, adding additional loss

Method used

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  • A slope-type refractive index distribution multi-core fiber with low crosstalk between cores
  • A slope-type refractive index distribution multi-core fiber with low crosstalk between cores
  • A slope-type refractive index distribution multi-core fiber with low crosstalk between cores

Examples

Experimental program
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Effect test

Embodiment 1

[0076] A slope-type refractive index distribution dual-core optical fiber with low inter-core crosstalk, its structural schematic diagram is shown in Figure 2(a), including a core area and a cladding area, and the core area includes the first core 201 of the slope-type dual-core optical fiber and the second core 202 of the ramp-type dual-core fiber.

[0077] Both the first core 201 of the ramp-type dual-core fiber and the second core 202 of the ramp-type dual-core fiber are made of highly doped silica glass rods, the cladding 2 is pure silica glass, and the maximum refractive index of the core is n 1 and cladding index n 0 The relative refractive index difference is (n 1 -n 0 ) / n 0 =1.54%, the core diameter is 9 μm, the core spacing is 30 μm, and the refractive index n of the conventional step dual-core fiber core is compared 2 and cladding index n 0 The relative refractive index difference is (n 1 -n 0 ) / n 0 =1.24%, and the cladding diameters are all 125 μm.

[0078]...

Embodiment 2

[0098] Extend dual-core fiber to more cores to Figure 5 The shown hexagonal distributed six-core optical fiber is taken as an example. The structural parameters are consistent with the double-core optical fiber structure in Embodiment 1 except for the number and arrangement of the cores. Image 6 As an example, the mode field is biased towards the high refractive index portion of each fiber core.

[0099] Using the power coupling equation in Embodiment 1 and the definition of each parameter can also obtain the crosstalk between adjacent cores in the six-core optical fiber:

[0100]

[0101] and crosstalk between spaced cores:

[0102]

[0103] The crosstalk between the two cores in the six-core optical fiber with hexagonal distribution is so small that it can be ignored for the above two kinds of crosstalk, so only the above two kinds of crosstalk are considered. The crosstalk comparison curves at the working wavelength of 1.55 μm are shown in Figure 7(a) and Figure 7...

Embodiment 3

[0105] On the basis of the dual-core structure in Example 1, an auxiliary groove structure is added around the fiber core, such as Figure 8 shown. Among them, the inner diameter of the trench is 7 μm, the outer diameter is 13 μm, and the refractive index at the working wavelength of 1.55 μm is 1.44. The simulation shows that the crosstalk with the unassisted structure is reduced by 9.26 dB after the transmission of 1 km at the working wavelength of 1.55 μm, and the crosstalk with the unassisted structure see comparison Figure 10 .

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Abstract

The invention discloses a slope-type refractive index distribution multi-core optical fiber with low inter-core crosstalk, which belongs to the technical field of space division multiplexing of optical fiber communication. The slope-type refractive index distribution multi-core fiber with low inter-core crosstalk includes a core and a cladding, the number of cores is at least two, the core is arranged in the cladding, and the refractive index of the core is greater than the refractive index of the cladding, In the cross-section of the fiber, the refractive index of the core area is symmetrically sloped with respect to the diameter of the fiber on both sides, and the refractive index of the core increases in the direction of the diameter of the connecting line from the center of the fiber to the center of each core. The slope-type refractive index distribution multi-core optical fiber with low inter-core crosstalk reduces the coupling between the cores by changing the distribution of the refractive index of the core material, reduces inter-core crosstalk, and effectively improves the information transmission quality of the multi-core optical fiber.

Description

technical field [0001] The invention belongs to the technical field of space division multiplexing of optical fiber communication, and relates to a slope-type refractive index distribution multi-core optical fiber with low inter-core crosstalk. Background technique [0002] With the development of services such as cloud computing, distributed computing, and content distribution, the capacity requirements for communication networks are increasing day by day. However, the single-core optical fiber communication capacity has approached the Shannon limit, and it will soon be difficult to meet the network capacity requirements. There are five physical dimensions of optical signals that can be modulated or multiplexed, namely time, frequency (wavelength), polarization state, complex amplitude, and space. Compared with other dimensions, Space Division Multiplexing (SDM) is considered to be An effective method to solve the capacity crisis of single-mode optical fiber communication ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/028
CPCG02B6/02042G02B6/0281
Inventor 程同蕾汪国瑞张继伟张函李曙光闫欣王方张学楠
Owner NORTHEASTERN UNIV LIAONING
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