A Brillouin Optical Time Domain Reflectometer Based on Multimode Fiber

Abstract

The invention discloses a Brillouin optical time-domain reflectometer based on a multimode optical fiber, which includes a laser, a polarization controller, a first variable optical attenuator, an electro-optical modulator, a pulse generator, a bias voltage controller, and a fiber coupling device, the second variable optical attenuator, the first erbium-doped fiber amplifier, the first isolator, the first grating filter, the third variable optical attenuator, multimode fiber circulator, the second erbium-doped fiber amplifier, the first Two isolators, a second grating filter, a fourth variable optical attenuator, a polarization scrambler, a multimode sensing fiber, a photoelectric detector, a bandpass filter, a data acquisition device, and a data processing terminal; The Rayleigh scattering signal interacts with the self-published Rieouin scattering signal, which eliminates the influence of the frequency drift of the light source, has good stability, and does not need to shift the reference optical path, which simplifies the system structure.

Description

A Brillouin Optical Time Domain Reflectometer Based on Multimode Fiber technical field The invention belongs to the distributed optical fiber sensing field, be specifically related to a kind of Brillouin optical time domain reaction based on multimode fiber radiometer. Background technique In industries such as electric power, petroleum, bridges, and railways, distributed optical fiber sensing technology relies on the small size and weight of optical fibers. Lightweight, resistant to electromagnetic interference, can act as both sensing and transmission elements, and distributed measurement and fault location capabilities, It has attracted extensive attention and has been successfully applied in the above-mentioned fields. Distributed optical fiber sensing technology based on Brillouin scattering is divided into Brillouin optical time domain according to the difference of detection signals. Reflection (BOTDR) and Brillouin Optical Time Domain Analysis (BOTDA). and...

AI Technical Summary

Problems solved by technology

However, the reference light and the self-Brillouin scattered light that has undergone the sensing process will be affected by factors such as the frequency drift of the light source during the heterodyne detection process, and the corresponding frequency shift operation will also increase the complexity of the system.

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