Multi-core fiber with low crosstalk between cores

A multi-core optical fiber and optical fiber technology, which is applied in the direction of multi-core optical fiber, cladding optical fiber, optical waveguide light guide, etc., to achieve the effect of low inter-core crosstalk, small bending loss and broad application prospects

Pending Publication Date: 2019-01-29
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is mainly aimed at reducing the crosstalk between transmission type weakly coupled multi-core optical fibers.

Method used

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  • Multi-core fiber with low crosstalk between cores
  • Multi-core fiber with low crosstalk between cores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A multi-core optical fiber with low crosstalk between cores is characterized in that it includes a central core 1, an annular groove structure I surrounding the central core, and six outer cores 2- 7. Annular trench structures II and III surrounding the six outer cores respectively, covering the central core, six outer cores, and the cladding of trench structures I, II and III.

[0021] Further, the central core 1 and the six outer cores 2-7 have the same positive effective refractive index difference (relative to the cladding refractive index) Δ1, and the value of Δ1 is 0.003. The cladding refractive index was set to 1.444.

[0022] Further, the annular groove structure I surrounding the core has a relatively low negative effective refractive index difference (relative to the cladding refractive index) Δ2, and the value of Δ2 is -0.002. The annular groove structures II and III surrounding the six outer cores and adjacent outer cores have different refractive index dif...

Embodiment 2

[0026] A multi-core optical fiber with low crosstalk between cores is characterized in that it includes a central core 1, an annular groove structure I surrounding the central core, and six outer cores 2- 7. Annular trench structures II and III surrounding the six outer cores respectively, covering the central core, six outer cores, and the cladding of trench structures I, II and III.

[0027] Further, the central core 1 and the six outer cores 2-7 have the same positive effective refractive index difference (relative to the cladding refractive index) Δ1, and the value of Δ1 is 0.0035. The cladding refractive index was set to 1.45.

[0028] Further, the annular groove structure I surrounding the core has a relatively low negative effective refractive index difference (relative to the cladding refractive index) Δ2, and the value of Δ2 is -0.0025. The ring-shaped groove structures II and III surrounding the six outer cores and adjacent outer cores have different refractive inde...

Embodiment 3

[0032] A multi-core optical fiber with low crosstalk between cores is characterized in that it includes a central core 1, an annular groove structure I surrounding the central core, and six outer cores 2- 7. Annular trench structures II and III surrounding the six outer cores respectively, covering the central core, six outer cores, and the cladding of trench structures I, II and III.

[0033] Further, the central core 1 and the six outer cores 2-7 have the same positive effective refractive index difference (relative to the cladding refractive index) Δ1, and the value of Δ1 is 0.0035. The cladding refractive index was set to 1.444.

[0034]Further, the annular groove structure I surrounding the core has a relatively low negative effective refractive index difference (relative to the cladding refractive index) Δ2, and the value of Δ2 is -0.0028. The ring-shaped groove structures II and III surrounding the six outer cores and adjacent outer cores have different refractive inde...

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Abstract

The invention relates to a multi-core fiber with low crosstalk between cores, and belongs to the field of optical fiber communication. The multi-core fiber with low crosstalk between the cores is characterized by comprising a middle core (1), an annular groove structure (I) around the periphery of the middle core, six outer cores (2)-(7) extending along the fiber axis and arranged in a regular hexagon shape, annular groove structures (II) and annular groove structures (III) around the peripheries of the six outer cores correspondingly, and wrapping layers covering the middle core, the six outer cores and the groove structures (I), (II) and (III). Different refractive indexes are arranged in the adjacent groove structures (I), (II) and (III) correspondingly, and the refractive index difference among the adjacent groove structures (I) and (II), (II) and (III) is no less than 0.001, and thus the purpose of suppressing crosstalk between the cores is achieved. Meanwhile, since the core structures are the same, the multi-core fiber with low crosstalk between the cores has smaller melting loss than ordinary single mode fibers, is facilitated to being drawn into the fiber, can be widely applied to air-division multiplexing optical fiber transmission system and other fields, and has broad application prospects.

Description

technical field [0001] The invention relates to a multi-core optical fiber with low crosstalk between cores, belonging to the field of optical fiber communication. Background technique [0002] In recent years, the rapid development of optical fiber communication and optical network has made space-division multiplexing optical fiber capable of large-capacity transmission a research hotspot, such as few-mode optical fiber, multi-core optical fiber, and few-mode multi-core optical fiber. Among them, the multi-core optical fiber can realize the expansion of the optical fiber without increasing the laying space and cost of the optical cable, and better overcome the limitation of the transmission capacity of the single-mode optical fiber, and has a very broad application prospect. [0003] Multi-core optical fiber refers to an optical fiber that accommodates multiple cores in the same cladding, and transmits optical signals through multiple cores. According to the working princi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02042
Inventor 裴丽解宇恒孙建斌郑晶晶宁提纲李晶
Owner BEIJING JIAOTONG UNIV
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