A correlative optical time domain reflectometer based on an all-fiber wide-spectrum chaotic light source

Abstract

The invention discloses a correlated optical time domain reflectometer based on an all-fiber wide-spectrum chaotic light source, and relates to the fields of chaotic fiber lasers and optical time domain reflectometers. The reflectometer includes: all-fiber chaotic light source and related optical time-domain reflectometry system; related optical time-domain reflectometry system includes: adjustable attenuator, optical filter, coupler, circulator, photodetector, oscilloscope; all-fiber The output light of the chaotic light source is injected into the correlation type optical time domain reflection system, and first passes through the adjustable attenuator, the optical filter, and the coupler in turn, and the chaotic optical signal passing through the coupler is divided into a reference signal and a detection signal, and the reference signal is directly obtained by the The photoelectric detector is converted into an electrical signal and collected and stored by an oscilloscope; the detection signal passes through a circulator to realize the function of a reflector, and the reflected signal is converted into an electrical signal by another photodetector and then collected and stored by the same oscilloscope. The invention has the advantages of simple system structure, high stability, high resolution sensing and long distance at the same time.

Description

technical field [0001] The invention relates to the fields of chaotic fiber lasers and optical time domain reflectometers, in particular to a correlation type optical time domain reflectometer based on full fiber broadband chaotic lasers. Background technique [0002] With the development of the information society, optical fiber communication and sensor networks are becoming larger and larger, and they are playing an increasingly important role in people's lives. For optical networks and devices, optical reflectometer technology is an important means of fault diagnosis. In this context, the development of optical reflectometer technology has received more and more attention. [0003] Optical reflectometer technology mainly includes three types: optical time domain reflectometry, low coherent frequency domain reflectometry, and coherent optical frequency domain reflectometry. These three optical reflectometer technologies are restricted in various indicators such as measure...

AI Technical Summary

Problems solved by technology

However, optical frequency domain reflectometry requires fine frequency-sweeping light sources and homodyne coherent detection, and its technical difficulty is greater than that of optical time domain reflectometry, and low-coherence frequency domain reflectometry is basically impossible for long-distance sensing

The prior technology CN101226100A uses LD-pumped chaotic light source to achieve 6cm sensing accuracy, but limited by its signal power and detector gain, its sensing distance is only tens of meters

Images