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

A technology of scanning lasers and modulating pulses, which is applied to lasers, laser components, and optical devices to transmit sensing components, etc., can solve problems such as high spatial resolution, long distance, and high-frequency band key index constraints, and improve linearity Sweep frequency range, ensure spatial resolution, and improve the effect of coherence length

Active Publication Date: 2019-08-23
LASER RES INST OF SHANDONG ACAD OF SCI
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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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  • EHz ultrafast modulation pulse scanning laser and distributed optical fiber sensing system
  • EHz ultrafast modulation pulse scanning laser and distributed optical fiber sensing system
  • EHz ultrafast modulation pulse scanning laser and distributed optical fiber sensing system

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Embodiment Construction

[0043] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0044] The laser is the key device for the distributed optical fiber sensing system to realize high-precision dynamic detection, and the parameters of the laser determine the performance parameters of the distributed optical fiber sensing. Among them, in the OFDR system, since its detection range is limited by the coherence length of the laser, this embodiment provides a new type of Ahertz ultra...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35387H01S3/0675H01S3/08086H01S3/09415H01S3/1608H01S3/2391H01S3/0064H01S3/1003H01S3/0078G01D5/35316G01D5/35335H01S3/0085H01S3/06716H01S3/1616H01S3/1618G01D5/35306
Inventor 尚盈王晨王昌倪家升赵文安李常曹冰黄胜王英英武延彬
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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