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Low-crosstalk large-mode-area multi-core fiber and preparation method thereof

A multi-core fiber, large mode field technology, applied in multi-core fiber, multi-layer core/clad fiber, clad fiber, etc., can solve the complex refractive index design of multi-core fiber, high technical cost and difficult production and other problems, to achieve the effect of breaking through the size limit, the process is simple, and the production efficiency is improved

Active Publication Date: 2018-06-19
JIANGSU STERLITE TONGGUANG FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above existing technical problems, the present invention provides a low crosstalk large mode area multi-core optical fiber and its preparation method to solve the complex refractive index design and high technical cost of low crosstalk large mode area multi-core optical fiber for large-capacity transmission. Difficult production problems

Method used

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  • Low-crosstalk large-mode-area multi-core fiber and preparation method thereof
  • Low-crosstalk large-mode-area multi-core fiber and preparation method thereof

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Embodiment 1

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] Such as figure 1 Shown is a low crosstalk large mode area multicore optical fiber and its preparation method, a low crosstalk large mode area multicore optical fiber, characterized in that it includes a central core 1 and a cladding layer surrounding the central core 1 I3, and multiple side cores 2a-2f extending along the fiber axis and arranged in a regular polygon, covering the central core 1, the cladding layer I3 and the cladding layers II4 of the multiple side cores 2a-2f.

[0036] Further, the central core 1 has the highest effective refractive index n1, where n1 is 1.4580, the multiple side cores 2a-2f have the same second highest effective refractive index n2, and n2 is 1.4573,...

Embodiment 2

[0040] Such as figure 2 Shown is a low crosstalk large mode field area multi-core fiber and its preparation method, which is characterized in that it includes the following steps:

[0041] Prepare core 1, deposit high-purity SiO selectively doped with metal elements or non-metal elements on the glass sleeve 2 , to prepare the core;

[0042] Preparing the cladding layer I3, vapor-phase-depositing doped silicon dioxide on the outside of the core axis to form the cladding layer I;

[0043] Prepare cladding layer II4, and cladding layer I is vapor-phase-deposited silicon dioxide doped with fluorine element on the outside of the cladding layer I to form cladding layer II;

[0044] Preparing the side core 2, using a drilling process to drill holes on the cladding layer II, and depositing a plurality of side cores in the holes;

[0045] Drawing to form a multi-core optical fiber.

[0046] Further, the metal element is one of germanium, antimony, erbium, ytterbium, praseodymium, ...

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Abstract

The invention relates to a low-crosstalk large-mode-area multi-core fiber and a preparation method thereof. The low-crosstalk large-mode-area multi-core fiber is characterized by comprising a centralcore, a coating layer I surrounding the central core, a plurality of bypass cores and a coating layer II, wherein the plurality of bypass cores extend along an optical fiber axis and are arranged in aregular polygon manner; and the coating layer II covers the central core, the coating layer I and the plurality of bypass cores. Different elements are doped into a process for manufacturing the central core, the bypass cores, the coating layer I and the coating layer II, so that refractive indexes of the four parts generate a certain refractive index difference, and the refractive indexes of thefour parts are ranked from the central core to the bypass cores to the coating layer I to the coating layer II from high to low. The purpose of the design is to effectively suppress inter-core crosstalk of the central core and the bypass cores. Meanwhile, by utilizing a principle that the refractive index of the coating layer I is lower than that of the central core or the bypass cores, energy inthe central core is further prevented from leaking out, the coating layer II has the lowest refractive index and located on the outermost side of the multi-core fiber, leakage of energy of the bypasscores is suppressed, the stability of the optical fiber structure is ensured, and the transmission efficiency of light signals is increased.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and in particular relates to a low-crosstalk large-mode field area multi-core optical fiber and a preparation method thereof. Background technique [0002] In recent years, the rapid development of optical fiber communications and optical networks has made optical fibers capable of large-capacity transmission a research hotspot, such as few-mode optical fibers and multi-core optical fibers. Among them, multi-core optical fiber based on space division multiplexing can realize the expansion of optical fiber without increasing the space and cost of optical cable laying, and better overcome the limitation of single-mode optical fiber transmission capacity. Research on multi-core fiber will have important application prospects. [0003] A multi-core optical fiber is an optical fiber that accommodates multiple cores in the same cladding, and transmits optical signals through multiple cores. Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02009G02B6/02042G02B6/03627
Inventor 孙建彬裴丽维捷卡彬解宇恒邱文强张荣旺
Owner JIANGSU STERLITE TONGGUANG FIBER
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