Slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk

A refractive index distribution, multi-core fiber technology, applied in graded-index core/clad fibers, multi-core fibers, clad fibers, etc. Factors increase, information transmission capacity is reduced and other problems, to achieve the effect of reducing crosstalk between cores, crosstalk between small cores, and improving communication quality

Active Publication Date: 2020-12-18
NORTHEASTERN UNIV
View PDF8 Cites 2 Cited by
  • 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 m

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk
  • Slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk
  • Slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0075]Example 1

[0076]A dual-core fiber with a sloped refractive index profile with low inter-core crosstalk. The schematic diagram of the structure is shown in Figure 2(a), including a core region and a cladding region. The core region includes the first core 201 of the sloped dual-core fiber And the second core 202 of the slope-type twin-core fiber.

[0077]Both the first core 201 of the slope-type dual-core fiber and the second core 202 of the slope-type dual-core fiber are made of highly doped silica glass rods, the cladding 2 is pure silica glass, and the core refractive index is the maximum value n1And cladding refractive index n0The relative refractive index difference is (n1-n0) / n0=1.54%, the core diameter is 9μm, the core spacing is 30μm, and the core refractive index n of the conventional step double-core fiber as a comparison2And cladding refractive index n0The relative refractive index difference is (n1-n0) / n0= 1.24%, and the cladding diameter is 125 μm.

[0078]Among them, the...

Example Embodiment

[0097]Example 2

[0098]Extend dual-core fiber to more cores toFigure 5 The hexagonal distributed six-core optical fiber is shown as an example. The structure parameters except for the number and arrangement of the cores are the same as the structure of the dual-core optical fiber in Example 1.Figure 6 As an example, the mode field is biased toward the high refractive index of each core.

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

[0100]

[0101]And the crosstalk between the spacer cores:

[0102]

[0103]The crosstalk between two cores in the hexagonal distributed six-core fiber is negligible for the above two types of crosstalk, so only the above two types of crosstalk are considered. The crosstalk comparison curves at the working wavelength of 1.55μm are shown in Figure 7(a) and Figure 7(b). It can be seen from the graphs that compared with the conventional step fiber, the ...

Example Embodiment

[0104]Example 3

[0105]On the basis of the dual-core structure of embodiment 1, a trench auxiliary structure is added around the core, such asFigure 8 Shown. The groove inner diameter is 7μm, the outer diameter is 13μm, and the refractive index at the working wavelength of 1.55μm is 1.44. The simulation shows that the crosstalk at the working wavelength of 1.55μm is reduced by 9.26dB compared with the crosstalk without auxiliary structure after 1km transmission. See by comparisonPicture 10 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk, and belongs to the technical field of space division multiplexing of opticalfiber communication. The slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk comprises at least two fiber cores and a cladding, the fiber cores are arrangedin the cladding, the refractive index of the fiber cores is larger than that of the cladding, and the refractive indexes of the fiber core areas are symmetrically distributed on the two sides of theoptical fiber in a slope mode relative to the diameter of the optical fiber on the cross section of the optical fiber. The refractive index of the fiber core increases in the diameter direction of theconnection line from the center of the optical fiber to the center of each fiber core. According to the slope type refractive index distribution multi-core optical fiber with low inter-core crosstalk, coupling between fiber cores is reduced by changing distribution of refractive indexes of fiber core materials, inter-core crosstalk is reduced, and then the information transmission quality of themulti-core optical fiber is effectively improved.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap