Few-mode optical fiber multi-damage parameter single-end synchronous measurement method and few-mode optical time domain reflectometer thereof

By injecting optical pulses into few-mode fibers and processing backscattered Rayleigh signals, the problem that traditional optical time-domain reflectometers cannot simultaneously measure multiple damage parameters at a single end is solved. This enables efficient measurement of mode coupling, mode correlation loss, and differential mode group delay, simplifies the system structure, and improves its practicality.

CN121508644APending Publication Date: 2026-02-10JILIN UNIVERSITY
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Patent Information

Application Number
CN202511706225.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-20
Publication Date
2026-02-10

AI Technical Summary

Technical Problem

In existing few-mode fiber optic communication systems, traditional optical time domain reflectometers cannot simultaneously measure multiple impairment parameters at a single end, especially differential mode group delay, resulting in complex system structures and low practicality.

Method used

A single-end synchronous measurement method for multiple damage parameters of few-mode fiber is adopted. By injecting optical pulses into the few-mode fiber under test, the back Rayleigh scattering signal is obtained and denoised by wavelet transform. The back Rayleigh scattering signal curve is processed by splicing algorithm to locate Fresnel reflection peak, calculate mode coupling coefficient and mode correlation loss, and realize single-end measurement.

Benefits of technology

This invention enables single-end synchronous measurement of mode coupling, mode correlation loss, and differential mode group delay in few-mode fibers, simplifying the system structure and improving the practicality and accuracy of the measurement.

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Abstract

The invention discloses a few-mode optical fiber multi-damage parameter single-end synchronous measurement method and a few-mode optical time domain reflectometer thereof, and belongs to the technical field of optical fiber characteristic measurement. The method comprises the following steps: injecting an optical pulse into a few-mode optical fiber to be detected, and obtaining back Rayleigh scattering signals in multiple modes; carrying out wavelet transform denoising on the obtained backward Rayleigh scattering signal; processing the curve of the denoised back Rayleigh scattering signal by adopting a splicing algorithm so as to eliminate a front-end saturation blind area; differential mode group time delay is measured based on a Fresnel reflection peak single end, the feature position of the Fresnel reflection peak at the tail end of each mode curve is positioned, and the differential mode group time delay is calculated according to the position difference; and synchronously calculating a mode coupling coefficient and mode correlation loss based on the processed curve data. According to the invention, the measurement accuracy of the differential mode group delay is improved.
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