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Large-mode-field single-mode optical fiber with multi-cladding spiral structure

A technology of helical structure, single-mode fiber, applied in the direction of multi-layer core/clad fiber, clad fiber, light guide, etc. Effect

Pending Publication Date: 2020-04-10
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the existence of physical mechanisms such as nonlinear effects and thermal damage in traditional gain fibers or communication fibers, the power capacity of transmitted light is severely limited

Method used

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  • Large-mode-field single-mode optical fiber with multi-cladding spiral structure
  • Large-mode-field single-mode optical fiber with multi-cladding spiral structure
  • Large-mode-field single-mode optical fiber with multi-cladding spiral structure

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Experimental program
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Effect test

Embodiment 1

[0021] The large-mode-field single-mode optical fiber with the multi-clad helical structure of this embodiment has a cross-sectional structure such as figure 2 As shown, including the fan-shaped cladding, the core 1 and the first cladding 2, the second cladding 3, the third cladding 4, and the fourth cladding 5 are all made of quartz glass material, and the core 1 is doped with Yb 3+ , the laser emission wavelength is 1.06 μm; the refractive index of the core 1 and the first cladding 2, the second cladding 3, the third cladding 4, and the fourth cladding 5 are 1.463, 1.462, 1.461, 1.464 and 1.460, respectively ; The diameter of the core 1 is 50 microns, the thickness of the first cladding 2 is 15 μm, the thickness of the second cladding 3 and the third cladding 4 is 100 μm; the central angle corresponding to the third cladding 4 is 5°, the first The thickness of the tetra-cladding layer 5 is 20 μm. The second cladding layer 3 and the third cladding layer 4 of the optical fib...

Embodiment 2

[0023] The large-mode-field single-mode optical fiber with the multi-clad helical structure of this embodiment has a cross-sectional structure such as image 3 As shown, including the strip-shaped cladding, the core 1 and the first cladding 2, the second cladding 3, the third cladding 4, and the fourth cladding 5 are all made of quartz glass material, and the core 1 is doped with Yb 3+ , the laser emission wavelength is 1.06 μm; the refractive index of the core 1 and the first cladding 2, the second cladding 3, the third cladding 4, and the fourth cladding 5 are 1.463, 1.462, 1.461, 1.464 and 1.460, respectively The diameter of the fiber core 1 is 50 microns, the thickness of the first cladding 2 is 15 μm, the thickness of the second cladding 3 and the third cladding 4 is 100 μm; the width of the narrow strip corresponding to the third cladding 4 is 10 μm, and the cladding Layer 5 has a thickness of 20 μm. The second cladding layer 3 and the third cladding layer 4 of the opti...

Embodiment 3

[0025] The large-mode-field single-mode optical fiber with the multi-clad helical structure of this embodiment has a cross-sectional structure such as Figure 4 As shown, the cladding core 1, the first cladding 2, the second cladding 3, the third cladding 4, and the fourth cladding 5 are all made of quartz glass material, and the core is doped with Tm 3+ , the laser emission wavelength is 1.9 μm; the refractive index of the core 1 and the first cladding layer 2, the second cladding layer 3, the third cladding layer 4, and the fourth cladding layer 5 are 1.463, 1.462, 1.462, 1.464, and 1.460, respectively ; The diameter of the core is 100 microns, the thickness of the cladding 2 is 20 μm, and the thickness of the claddings 3 and 4 is 100 μm; the central angle corresponding to the cladding 4 is 3°, and the second cladding 3 and the third cladding 4 There are four in each, and they are evenly spaced and symmetrically distributed around the cladding layer 2; the thickness of the c...

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Abstract

The invention discloses a large-mode-field single-mode optical fiber of a multi-cladding spiral structure. The optical fiber is composed of a fiber core (1), a first cladding (2), a second cladding (3), a third cladding (4) and a fourth cladding (5). The refractive index of the fiber core (1) is n1, the refractive indexes of the first cladding (2), the second cladding (3), the third cladding (4) and the fourth cladding (5) are n2, n3, n4 and n5 respectively, and n1 is greater than or equal to n3 and less than or equal to n4 and greater than or equal to n3 and less than or equal to n2. Throughoptimal selection of parameters and structures, the transmission loss of the LP01 mode can be less than 0.1 dB / m, and the transmission loss of the LP11 mode is greater than 10dB / m, so that the internationally recognized loss requirement of the large-mode-field single-mode optical fiber is met. The core diameter range of the single mold is flexible and adjustable. The diameter of a single-mode field which can be realized by the optical fiber is far greater than that of an existing commercialized single-mode optical fiber.

Description

technical field [0001] The invention relates to a single-mode optical fiber, in particular to a large-mode-field single-mode optical fiber with a multi-clad helical structure. Background technique [0002] Due to the existence of physical mechanisms such as nonlinear effects and thermal damage in traditional gain fibers or communication fibers, the power capacity of transmitted light is severely limited. However, the nonlinear effect of light is inversely proportional to the mode field area of ​​the fiber. The larger the mode field area, the weaker the nonlinear effect and the higher the nonlinear threshold. Therefore, increasing the mode field diameter of the fiber is the most direct and effective way to improve the optical transmission capacity of the fiber. However, in order to ensure the beam quality of the output laser, it is required to increase the mode field area and at the same time make the fiber capable of single-mode operation, so the research on single-mode fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036
CPCG02B6/036G02B6/03605
Inventor 沈骁
Owner NANJING UNIV OF POSTS & TELECOMM