Fiber laser source based on pulse seed source amplification and fiber sensing system

Abstract

The invention relates to a short-pulse and high-power fiber laser source based on pulse seed source amplification and a fiber sensing system. The fiber laser source comprises a pulse signal source, a high-speed laser drive circuit, a pulse seed laser, a wavelength division multiplexer and a rear earth doped fiber which are connected in sequence. The fiber laser source also comprises a pump laser, wherein the output end of the pump laser is connected with the input end of the wavelength division multiplexer. The rear earth doped fiber also has pulse laser output end with peak value. The invention also relates to the fiber sensing system utilizing the laser source. Through adopting the fiber laser source and the fiber sensing system of the invention, when the light output by the pump laser hits the rare-earth metal ions, the rare-earth metal ions are excited to the metastable state, when the ions are injected all the time through pumping, the number of the rare-earth metal ions in the metastable state reaches the high level inversion number, at the moment, a beam of signal light is emitted, the high level inversion number forms high magnification and the ions in the metastable state return to the normal state so that a beam of pulse light with peak value can be released.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to the field of optical fiber sensing technology, and specifically refers to a fiber laser light source and fiber sensing system based on pulsed seed source amplification. Background technique [0002] The optical fiber sensing system based on Raman scattering and Brillouin scattering technology, because of its simple sensing medium (ordinary optical fiber) and continuous distributed sensing, is widely used in the stress health of bridges, tunnels, dams and other buildings. Monitoring, as well as petroleum, transmission and transformation cable pipeline temperature monitoring and other industries. [0003] This type of fiber optic sensing system basically adopts the following structure: a high peak power pulse light source is injected into the sensing fiber through a directional coupler, a common single-mode fiber or a common multimode fiber, and due to Raman scattering, a backward St...

AI Technical Summary

Problems solved by technology

[0005] (1) It is difficult to achieve high peak power. Due to the influence of the laser manufacturing process, there are few practical high peak power semiconductor lasers;

[0006] (2) The cost is high, because the output of lasers with high peak power is small and difficult to realize, so the production cost is high;

[0007] (3) It is difficult to achieve short pulses, because the pulse length of the system directly determines the spatial resolution index of the system test, the system with a test accuracy below 1m needs a pulse width of about 10ns, and the high peak power semiconductor laser drive current is very low. Large, usually in the order of tens of amperes, it is quite difficult to realize such a high current in such a short period of time.

[0008] In short, the conventional pulsed laser method is difficult to reach the commercialization level of the system both in terms of technical realization and cost control

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