A low-crosstalk weak-coupling space-division multiplexing optical fiber

A space division multiplexing and weak coupling technology, applied in clad fibers, multi-core fibers, multi-layer core/clad fibers, etc. The effect of reducing complexity and cost, increasing transmission capacity

Active Publication Date: 2021-03-16
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that most of the current multi-core optical fibers adopt the multi-core single-mode optical fiber structure, the capacity resources in the optical fiber have not been fully explored

Method used

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  • A low-crosstalk weak-coupling space-division multiplexing optical fiber
  • A low-crosstalk weak-coupling space-division multiplexing optical fiber
  • A low-crosstalk weak-coupling space-division multiplexing optical fiber

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Effect test

Embodiment 1

[0061] The few-mode core region 1 of the low-loss weak-coupling space-division multiplexing optical fiber provided in this embodiment is designed with a step-refractive index distribution, and is arranged in a hexagonal manner to form a seven-core optical fiber. The few-mode core region 1 uses germanium-doped quartz material, and the relative refractive index difference with pure quartz is Δ 1 0.30%. Inner cladding 2, depressed cladding 3 and multi-core fiber cladding 5 are all made of fluorine-doped silica material, where the relative refractive index difference between inner cladding 2 and pure silica is Δ 2 is -0.14%, the relative refractive index difference Δ between the depressed cladding 3 and pure quartz 3 was -0.54%. Relative refractive index difference Δ between multi-core fiber cladding 5 and pure silica 4 was -0.11%. The radius R of the few-mode core region 1 of the space division multiplexing fiber 1 is 6.7μm, the radius R of the inner cladding 2 2 is 7.9 μm,...

Embodiment 2

[0066] The few-mode core region 1 of the low-loss weak-coupling space-division multiplexing optical fiber provided in this embodiment adopts a graded refractive index distribution design, and is arranged in a hexagonal manner to form a seven-core optical fiber. The few-mode core area 1 uses germanium-doped quartz material, the power index of the refractive index gradient distribution is 1.96, and the relative refractive index difference between the maximum refractive index at the axial direction of the core area and pure quartz is Δ axial 0.50%. The inner cladding 2 is made of fluorine-doped quartz material, and the relative refractive index difference with pure quartz is Δ 2 is -0.03%. The depressed cladding 3 is made of fluorine-doped quartz material, and the relative refractive index difference with pure quartz is Δ 3 is -0.40%. The multi-core optical fiber cladding 5 uses pure silica material. The radius R of the few-mode core region 1 of the space division multiplexin...

Embodiment 3

[0071] The few-mode core region 1 of the low-loss weak-coupling space-division multiplexing optical fiber provided in this embodiment is designed with a step-refractive index distribution, and is arranged in a hexagonal manner to form a seven-core optical fiber. The few-mode core region 1 uses germanium-doped quartz material, and the relative refractive index difference with pure quartz is Δ 1 0.80%. The inner cladding 2 is made of fluorine-doped quartz material, and the relative refractive index difference with pure quartz is Δ 2 is -0.02%. The depressed cladding 3 is made of fluorine-doped quartz material, and the relative refractive index difference with pure quartz is Δ 3 was -0.51%. The multi-core optical fiber cladding 5 uses pure silica material. The radius R of the few-mode core region 1 of the space division multiplexing fiber 1 is 8.4 μm, the radius R of the inner cladding 2 2 is 9.15 μm, the radius R of the depressed cladding 3 3 is 11.75 μm. The core spacin...

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Abstract

The invention discloses a low-crosstalk weak-coupling space-division multiplexing optical fiber, which relates to the field of communication optical fibers, and includes a multi-core optical fiber cladding; wherein, the multi-core optical fiber cladding contains multiple The number of the few-mode fiber cores arranged in a manner is not less than three; the few-mode fiber cores include the few-mode core area, the inner cladding layer and the sunken cladding layer sequentially from the inside to the outside. The space-division multiplexing fiber adopts a weakly coupled few-mode fiber core and a low-crosstalk multi-core fiber structure, so that the channels between the cores and the modes in the core of the entire fiber are completely separated, and are multiplexed at the input and output ends. / Demultiplexing technology to complete the link communication transmission, thus effectively increasing the overall transmission capacity of the optical fiber with high transmission quality.

Description

technical field [0001] The invention belongs to the technical field of communication optical fibers, and in particular relates to a low-crosstalk weak-coupling space-division multiplexing optical fiber. Background technique [0002] At present, the spectral efficiency of DWDM (Dense Wavelength Division Multiplexing, DWDM) used in single-mode optical fiber in optical communication networks is approaching its theoretical limit, and the performance of optical fiber will be limited by nonlinear effects. For the work that breaks through the capacity limit, the multi-ary modulation technology in the amplitude and phase dimensions of the optical signal is more researched. However, in practical systems, higher optical signal-to-noise ratios and lower nonlinear effects are necessary to ensure smooth reception at the receiving end after the optical signal modulation order is increased. Therefore, the improvement of optical fiber transmission capacity by increasing the optical signal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02042G02B6/036
Inventor 张一弛喻煌骆城祝威余俊
Owner FENGHUO COMM SCI & TECH CO LTD
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