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Low-crosstalk weakly-coupled spatial division multiplexing fiber

A space-division multiplexing and weak-coupling technology, which is applied in the direction of multi-core optical fiber, cladding optical fiber, multi-layer core/clad optical fiber, etc., can solve the problems of incomplete exploration of optical fiber capacity resources, etc., and achieve the suppression of inter-core crosstalk, The effect of reducing bit error rate and improving transmission quality

Active Publication Date: 2019-08-09
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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  • Low-crosstalk weakly-coupled spatial division multiplexing fiber
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  • Low-crosstalk weakly-coupled spatial division multiplexing fiber

Examples

Experimental program
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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 6.7 μm, 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 weakly-coupled spatial division multiplexing fiber, which relates to the field of communication fibers. The low-crosstalk weakly-coupled spatial division multiplexing fiber comprises a multi-core fiber cladding layer; the multi-core fiber cladding layer comprises multiple few-mode fibers which are arranged hexagonally or in other axial symmetry modes; the number of the few-mode fibers is no smaller than 3; and the few-mode fiber comprises a few-mode core area, an inner cladding layer and a depressed cladding layer sequentially arranged from inside to outside. The spatial division multiplexing fiber adopts the weakly-coupled few-mode fiber core area and the low-crosstalk multi-core fiber structure, channels between the core areas inside the whole fiber and channels between modes in the core areas are completely separated, a multiplexing / demultiplexing technology is matched at input and output ends to complete link communication transmission, the whole transmission capacity of the fiber is effectively enhanced, and the transmission quality is high.

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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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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