EHz ultrafast modulation pulse scanning laser and distributed optical fiber sensing system

Abstract

The invention provides an EHz ultrafast modulation pulse scanning laser and a distributed optical fiber sensing system. A doped optical fiber is carved with a plurality of phase shift gratings with different central window wavelengths, and the wavelength interval between adjacent central window wavelengths is a preset fixed value; when pump light emitted by a pump laser source enters the doped optical fiber through the coupling of a wavelength division multiplexer, the phase shift gratings carved on the doped optical fiber can generate multi-wavelength single-mode narrow-linewidth laser with the wavelength interval of the preset fixed value; and then, the ultrafast modulation is finished by a time domain control method based on EOM (Ethernet over coax) to obtain internal variable frequencypulse light formed by continuously splicing a plurality of pulse lights with linearly increasing frequencies, thereby forming the EHz ultrafast modulation of the distributed feedback fiber laser. Therefore, the coherence length of output laser can be increased on the premise that the laser frequency is unchanged, and the problem that the existing distributed optical fiber sensing system is restricted in high spatial resolution, long distance and high frequency band can be effectively solved.

Description

technical field [0001] The present application relates to the technical field of distributed optical fiber sensing, in particular to an Ahtz ultrafast modulated pulse scanning laser and a distributed optical fiber sensing system. Background technique [0002] Since the distributed optical fiber sensing technology can realize the continuous sensing and measurement of the measured physical quantities distributed along the length of the optical fiber, it can integrate the sensing and transmission functions, and can not only complete the spatial distribution of the distributed environmental parameters along the entire length of the optical fiber. , The continuous measurement of time multi-dimensional distribution state information can also transmit the distributed measurement information to the information processing center in real time and non-destructively. At the same time, the sensing system based on distributed optical fiber sensing technology has simple structure, convenien...

AI Technical Summary

Problems solved by technology

[0005] This application provides an Ahtz ultrafast modulated pulse scanning laser and a distributed optical fiber sensing system, which solves the problems of the existing distributed optical fiber sensing system in terms of high spatial resolution, long distance, and key indicators in high frequency bands.

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