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A High Purity, Low Intrinsic Crosstalk Optical Fiber for Orbital Angular Momentum Transmission

An orbital angular momentum, transmission fiber technology, applied in the direction of multi-core fiber, cladding fiber, optical waveguide light guide, etc. Simple structure and the effect of improving information transmission capacity

Active Publication Date: 2018-05-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intrinsic crosstalk of the ring fiber is too large, which makes it difficult to apply to the long-distance fiber optic communication system, and also makes the demultiplexing module of the OAM fiber optic communication system more complicated

Method used

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  • A High Purity, Low Intrinsic Crosstalk Optical Fiber for Orbital Angular Momentum Transmission
  • A High Purity, Low Intrinsic Crosstalk Optical Fiber for Orbital Angular Momentum Transmission
  • A High Purity, Low Intrinsic Crosstalk Optical Fiber for Orbital Angular Momentum Transmission

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Figure 1a , Figure 1b It is a refractive index distribution diagram and a schematic cross-sectional diagram of an example of the OAM transmission fiber with high purity and low intrinsic crosstalk of the present invention. The optical fiber includes a core 1 located at the center of an optical fiber and a cladding 2 concentrically surrounding the periphery of the core. The cladding layer 2 of the optical fiber has a diameter of 125 μm and a refractive index of 1.46. The refractive index distribution of the fiber core 1 satisfies in, The specific parameters are: n 1 = 1.56; r 0 = 3.8 μm; Δ = 0.062 and α = 3.80. The base material of the optical fiber preform is quartz glass, gradually doped with germanium dioxide (65→0mol%) from the axis of the core to the edge of the core, and the doping process is precisely controlled by the vapor deposition method to achieve the refraction of the core Rate distribution; cladding material is quartz glass. The optical fiber pr...

Embodiment 2

[0026] Figure 4 is a schematic cross-sectional view of an example of the OAM transmission fiber with high purity and low intrinsic crosstalk of the present invention. The fiber comprises a core (1 and 2) at the center of the two fibers and a cladding 3 surrounding the core. The cladding layer 3 of the optical fiber has a diameter of 125 μm and a refractive index of 1.46. The refractive index distribution of the fiber core satisfies in, The structural parameters of core 1 are: n 1 = 1.56; r 0 =3.8μm; Δ=0.062 and α=3.80; the structural parameters of the core 2 are: n 1 = 1.56; r 0 = 3.9 μm; Δ = 0.062 and α = 4.10. Core 1 is located on the left side of the fiber, with a distance of 6 μm from the center of the fiber; core 2 is located on the right side of the fiber, with a distance of 8 μm from the center of the fiber. The base material of the optical fiber preform is quartz glass, and germanium dioxide doping (65→0mol%) is gradually carried out from the axis of the fib...

Embodiment 3

[0028] Figure 5 is a schematic cross-sectional view of an example of the OAM transmission fiber with high purity and low intrinsic crosstalk of the present invention. The optical fiber includes 19 cores (1-19) and a cladding 20 surrounding the periphery of the cores. The cladding 20 of the optical fiber has a diameter of 125 μm and a refractive index of 1.46. The 19 optical fiber cores have the same refractive index distribution, all satisfying in, The specific parameters are: n 1 = 1.56; r 0 = 3.8 μm; Δ = 0.062 and α = 3.80. Such as image 3 As shown, core 1 is located in the center of the fiber; cores 2-7 evenly surround the outer periphery of core 1, and the distance from core 1 is 20 μm; cores 8-19 evenly surround the outermost layer, and are located on the six sides At the six vertices and the centers of the six sides of a shape (with a side length of 40 μm). The base material of the optical fiber preform is quartz glass, from the axis of the core to the edge of...

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Abstract

The invention discloses an orbital angular momentum transmission fiber high in purity and low in intrinsic crosstalk. Intrinsic crosstalk is channel crosstalk caused by a fiber structure itself, and is a crosstalk limiting value of an actual OAM optical communication system. A fiber structure with a continuous refractive index distribution curve is adopted, the OAM transmission optical purity of the fiber exceeds 99.9%, and therefore intrinsic crosstalk lower than -30dB is achieved. Compared with a common multi-mode fiber, a single fiber core with a large relative refractive index difference and a small fiber core radius can simultaneously support OAM light the number of which is more than ten for transmission. With a multi-core structure, the single fiber can support more than 190 OAM transmission signals. The fiber of the invention is simple in structure and low in loss, is easy to manufacture, and can be widely applied to a long-distance OAM optical fiber communication system.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an orbital angular momentum (Orbital angular momentum, OAM) transmission optical fiber with high purity and low intrinsic crosstalk. Background technique [0002] With the continuous development and improvement of communication technology, time division multiplexing technology, wavelength division multiplexing technology and polarization multiplexing technology have been widely used in single-mode optical fiber communication systems, and their transmission capacity is close to Shannon's limit. However, the rapid development of mobile Internet, cloud computing, and the Internet of Things has led to an exponential growth in the demand for transmission capacity in global communication systems. Therefore, it is of great strategic significance to promote economic and social development to upgrade the communication system with new multiplexing technology and further increase ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02
CPCG02B6/02042
Inventor 杨中民张智深甘久林衡小波钱奇陈东丹
Owner SOUTH CHINA UNIV OF TECH
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