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

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...

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

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