Brillouin optical time domain analyzer relevant to chaotic laser

Abstract

A chaotic laser light related Brillouin optical time-domain analyzer is an optical fiber Brillouin optical time-domain analyzer fabricated by using chaotic laser related principles, deformation of coherent amplification of Brillouin scattered light, the temperature effect and optical time-domain reflection principles, and uses one same chaotic laser as a local reference light source and a pump signal light source for the Brillouin optical time-domain analyzer. The chaotic laser has an ultra-large bandwidth. The chaotic laser light related Brillouin optical time-domain analyzer, by using the chaotic laser principle, performs related processing on signal light and local light to obtain the high spatial resolution, thereby effectively enhancing the reliability of a sensing system, where the spatial resolution may reach a centimeter level, and the number of pump photons that enter the sensing optical fiber is also increased, so that the signal-to-noise ratio of the sensing system is increased by 10 dB, and the measurement length of a sensor may be increased to 50 km. By using one same chaotic laser as the local signal light source and pump signal light source of the Brillouin optical time-domain analyzer, the difficulties in locking a narrowband detection laser and a narrowband pump laser are also solved, thereby enhancing the stability of the system.

Description

technical field [0001] The invention relates to a chaotic laser correlation Brillouin optical time domain analyzer, which belongs to the technical field of distributed optical fiber sensors. Background technique [0002] In the field of optical fiber Brillouin optical time domain analyzer, in order to improve the spatial resolution of the sensor, a narrow pulse light source is used, but due to the nonlinear effect of the optical fiber, the incident power of the optical fiber is limited. Therefore, it is necessary to achieve long distance and high spatial resolution. The fiber Brillouin optical time domain analyzer with high efficiency is very difficult. The traditional method of compressing laser pulse width and the method of double pulse pair are difficult to achieve the effect of long-distance spatial resolution less than 1 meter, and the spatial resolution is related to the measurement length. , the signal-to-noise ratio of the system is also low. Moreover, the prior art...

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Problems solved by technology

[0002] In the field of optical fiber Brillouin optical time domain analyzer, in order to improve the spatial resolution of the sensor, a narrow pulse light source is used, but due to the nonlinear effect of the optical fiber, the incident power of the optical fiber is limited. Therefore, it is necessary to achieve long distance and high spatial resolution. The fiber Brillouin optical time domain analyzer with high efficiency is very difficult. The traditional method of compressing laser pulse width and the method of double pulse pair are difficult to achieve the effect of long-distance spatial resolution less than 1 meter, and the spatial resolution is related to the measurement length. , the signal-to-noise ratio of the system is also low

And the existing technology still has difficulty in locking the narrow-band detection laser and the narrow-band pump laser

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