Few-mode optical fiber fault detection method based on high-order mode backward Rayleigh scattering

Abstract

The invention discloses a few-mode optical fiber fault detection method based on high-order mode backward Rayleigh scattering, and belongs to the technical field of optical fiber fault detection. Theinvention aims to solve the problem of low sensitivity caused by fault detection of the few-mode fiber by only utilizing Rayleigh scattering of the fundamental mode back direction, and the fault eventpositioning of the few-mode fiber link cannot be accurately and effectively realized. An evaluation standard with rayleigh scattering at the back of a few-mode fiber high-order mode as fault detection is provided. By means of the characteristic of high detection sensitivity of the few-mode fiber high-order mode, effective characterization of different fault amplitude loss events can be achieved,comprehensive evaluation of few-mode fiber link fault events is achieved, and a powerful guarantee is provided for simple and accurate fault detection of few-mode fiber links.

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 brought 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 mult...

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

Images