Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology

A mode division multiplexing, multi-core and few-mode technology, applied in multi-core optical fiber, multi-layer core/clad optical fiber, clad optical fiber, etc., can solve the problems of refractive index difference, optical fiber capacity reaching the upper limit, and transmission speed that cannot meet the requirements To meet the actual needs and other issues, achieve the effect of suppressing crosstalk level, reducing preparation, and meeting size requirements

Active Publication Date: 2021-02-09
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the transmission capacity of the current communication optical fiber tends to the upper limit, and the transmission speed gradually cannot meet the actual needs, the present invention designs a technology based on space division-mode division multiplexing based on the space dimension used less in the multiplexing dimension of the optical fiber physical layer. The dual-groove surround multi-core few-mode fiber can be designed to adjust the diameter of the few-mode core region, the distance between adjacent cores, the width of the quartz cladding, and the width of the groove cladding, and control the refractive index difference of the material to ensure that each The number of few-mode fiber core transmission modes is 5-8. On this basis, the inter-core crosstalk, inter-mode crosstalk and differential mode group delay are controlled, and the fiber size is controlled as much as possible to expand the fiber communication capacity and meet the communication fiber standard.
This method can effectively solve the problem of reaching the upper limit of the capacity of traditional optical fibers, so as to realize a practical high-speed, large-capacity all-optical communication network

Method used

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  • Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology
  • Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology
  • Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology

Examples

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Embodiment 1

[0043] This example provides a dual-groove surround-type multi-core few-mode optical fiber based on space division-mode division multiplexing technology. The core adopts a step-refractive index distribution design. A total of 13 few-mode cores are distributed in the cladding area of ​​the fiber, the diameter of the few-mode core area is 12 μm, and the width of the quartz cladding is b 1 2μm, b 2 is 2μm, the trench inner cladding width c 1 3μm, trench outer cladding width c 2 is 3 μm, the fiber core spacing d is 35 μm, and the fiber outer diameter is 160 μm.

[0044] The few-mode core region is a germanium-doped quartz material with a refractive index of 1.46855, and the relative refractive index difference with pure quartz material is Δ 1 1.7%; the quartz cladding is pure quartz material with a refractive index of 1.444; the trench cladding is made of fluorine-doped quartz material with a refractive index of 1.42956, and the relative refractive index difference with pure qu...

Embodiment 2

[0054] This example provides a dual-groove surround-type multi-core few-mode fiber based on space division-mode division multiplexing technology. The core adopts a step refractive index distribution design, and 13 few-mode cores are designed; A total of 13 few-mode cores are distributed in the base area of ​​the double-groove surrounding multi-core few-mode fiber, the diameter of the few-mode core area is 10 μm, and the width of the quartz cladding is b 1 2μm, b 2 is 2μm, the trench inner cladding width c 1 5μm, trench outer cladding width c 2 is 5 μm, the fiber core spacing d is 40 μm, and the fiber outer diameter is 180 μm.

[0055] The few-mode core region is a germanium-doped quartz material with a refractive index of 1.4671, and the relative refractive index difference with pure quartz material is Δ 1 1.6%; the quartz cladding is pure quartz material with a refractive index of 1.444; the trench cladding is made of fluorine-doped quartz material with a refractive index ...

Embodiment 3

[0059] This example provides a double-groove surround-type multi-core few-mode fiber based on space division-mode division multiplexing technology. The schematic diagram of the preform structure is as follows Figure 12 As shown, there are 13 few-mode cores, and the number of transmission modes of each few-mode core is 5; one few-mode core 6 is placed in the center of the fiber, and the remaining 12 few-mode cores are center-symmetrical in a double-ring structure Arrangement, 6 few-mode cores are evenly distributed in each ring; Among them, the few-mode cores of the first ring are arranged in a regular hexagonal structure around the few-mode core in the center, and the few-mode cores of the second ring are in the shape of a hexagram The structures are evenly arranged on the periphery of the first ring few-mode fiber. The few-mode fiber core is doped with germanium or fluorine to increase and decrease the refractive index. The few-mode fiber core can be made by vapor deposition...

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Abstract

The invention provides a double-groove surrounding type multi-core few-mode optical fiber based on a space division-mode division multiplexing technology, and belongs to the field of communication optical fibers. The cross section of the optical fiber comprises 13 few-mode fiber cores; the few-mode fiber cores are sequentially provided with a few-mode core area, two quartz cladding layers and twogroove cladding layers from inside to outside at intervals; the number of transmission modes of a single few-mode fiber core is 5-8; one few-mode fiber core is placed in the center of the cross section of the optical fiber, the rest 12 few-mode fiber cores are distributed around the central few-mode fiber core in a double-ring arrangement central symmetry mode, and any three adjacent few-mode fiber cores are equidistant. According to the multi-core few-mode optical fiber, the performance of the optical fiber is adjusted and optimized by adjusting the fiber core diameter, the fiber core distance, the material refractive index difference and the groove depth and width, the size of the optical fiber is reduced as much as possible, and on the basis, inter-core/inter-mode crosstalk and differential mode group delay are controlled, so that the communication requirement is met, and the communication capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, in particular to a double-groove surround-type multi-core few-mode optical fiber based on space division-mode division multiplexing technology. Background technique [0002] Since Corning Corporation produced the first optical fiber in 1970, optical fiber communication technology has developed rapidly, and optical fiber communication has become the cornerstone of today's information society. With the increasing demand for information in society, today's optical fiber communication systems are developing towards ultra-high-speed, large-capacity, and long-distance. However, the gradual performance improvement achieved under the existing technology has approached the capacity limit of traditional single-mode physical channels. Since the 1990s, the transmission capacity of the global optical fiber communication network has followed the rapid increase of the society's demand for in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02042G02B6/03688
Inventor 李曙光李增辉王璐瑶李建设
Owner YANSHAN UNIV
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