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A Fault Detection Method for Few-Mode Optical Fibers Based on Higher-Order Mode Back Rayleigh Scattering

A Rayleigh scattering and few-mode fiber technology, which is applied in electrical components, electromagnetic wave transmission systems, transmission systems, etc., can solve the problems that affect the accuracy of few-mode fiber fault detection, the low sensitivity of fundamental mode fault detection, and the inability to realize detection, etc.

Active Publication Date: 2021-04-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most common optical fiber fault detection solution is to use single-mode OTDR. When single-mode OTDR is used to detect few-mode fiber faults, it can only detect the fundamental mode in the few-mode fiber, and cannot detect other spatial modes.
And because the fault detection sensitivity of the fundamental mode is low and the fault loss amplitude is too small, which affects the fault detection accuracy of the few-mode fiber
Therefore, the fundamental mode cannot only be used as the detection standard for judging few-mode fiber fault events

Method used

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  • A Fault Detection Method for Few-Mode Optical Fibers Based on Higher-Order Mode Back Rayleigh Scattering
  • A Fault Detection Method for Few-Mode Optical Fibers Based on Higher-Order Mode Back Rayleigh Scattering
  • A Fault Detection Method for Few-Mode Optical Fibers Based on Higher-Order Mode Back Rayleigh Scattering

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Embodiment

[0040] Example: such as image 3 As shown, the method proposed in the present invention is verified experimentally using a few-mode fiber fault detection system. Fault detection on few-mode fiber links is achieved through single-ended operation.

[0041] In this embodiment, various parameters of the optical pulse generation module 11 are set to generate suitable optical pulses. In this embodiment, the following parameters are used to detect the fault event of the fusion splice point of the six-mode step optical fiber. Then the peak power is 40mv, the pulse width is 300ns, and the repetition frequency is the optical pulse signal of 4kHz. Special note: The pulse width will affect the size of the spatial resolution, the wider the pulse width, the greater the spatial resolution, and the fault location accuracy will be reduced.

[0042] In this embodiment, the optical path transmission module 12 is mainly composed of a mode converter 121, a mode demultiplexer 123, and a few-mode ...

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Abstract

The invention discloses a few-mode optical fiber fault detection method based on high-order mode back Rayleigh scattering, and belongs to the technical field of optical fiber fault detection. The present invention aims at the problem of low sensitivity caused by fault detection by only using the fundamental mode back Rayleigh scattering of the few-mode optical fiber, and cannot accurately and effectively realize the location of the fault event of the few-mode optical fiber link. An evaluation criterion for fault detection based on the high-order mode back Rayleigh scattering of few-mode fiber is proposed. Using the high detection sensitivity characteristics of the high-order mode of few-mode fiber, the effective characterization of different fault amplitude loss events can be realized, and then few The comprehensive evaluation of the fault event of the mode fiber link provides a strong guarantee for the simple and accurate fault detection of the few-mode fiber link.

Description

technical field [0001] The invention belongs to the technical field of optical fiber fault detection, and in particular relates to a few-mode optical fiber fault detection method based on high-order mode back Rayleigh scattering. Background technique [0002] In recent years, with the continuous emergence of bandwidth-consuming services such as mobile Internet, Internet of Things, cloud computing, and big data, the demand for network bandwidth has grown exponentially. As a result, a single-mode fiber (Single-Mode Fiber, SMF) communication system cannot meet the current communication capacity requirements. In order to solve the capacity shortage problem caused by the single-mode fiber system, Mode Division Multiplexing (MDM) technology based on Few-Mode Fiber (FMF) has attracted the attention of scholars at home and abroad. In FMF, a limited number of independent orthogonal spatial modes can be used for signal bearing to realize independent and parallel transmission of multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/079
CPCH04B10/0791
Inventor 胡贵军宋聪聪刘秀环刘峰陈威成李雪晴于勇
Owner JILIN UNIV
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