Wavelength scanning optical fiber laser device and optical fiber sensing system consisting of same

Abstract

The invention relates to a wavelength scanning optical fiber laser device. A scanning filter, a first optical fiber isolator, optical fiber amplifiers and a second optical fiber isolator are in closed-loop connections in turn and form a light wave passing loop; a first directional coupler is connected to the light wave passing loop and is provided with a scanning laser output end, and preferably, the first directional coupler is connected between the scanning filter and the connecting end of the first optical fiber isolator, between the first optical fiber isolator and the connecting ends of the optical fiber amplifiers, or between the connecting ends of two optical fiber amplifiers; the scanning filter is a scanning filter based on FP cavity piezoelectric ceramic drive or a scanning filter based on a micro electromechanical technique; and the optical fiber amplifiers are rare-earth doped optical fiber amplifiers or semiconductor optical fiber amplifiers. The invention also provides an optical fiber sensing system adopting the wavelength scanning optical fiber laser device as a light source. The wavelength scanning optical fiber laser device and the optical fiber sensing system have smart design, greatly reduce the processing difficulty and cost of the optical fiber sensing system, and can achieve multi-channel cascade connection.

Description

technical field [0001] The present invention relates to the technical field of optoelectronics, in particular to the technical field of lasers, in particular to a wavelength scanning optical fiber laser device and an optical fiber sensing system constituted by it. Background technique [0002] Optical fiber sensing system based on FBG (Fiber Bragg Grating) technology is the most widely used technology in optical fiber sensing, widely used in the stress health monitoring of bridges, tunnels, dams and other buildings, as well as the temperature of petroleum and transmission and transformation cables In industries such as monitoring, the basic principle and structure adopted are as follows: figure 1 shown. [0003] Among them, the broadband light source generally adopts superluminescent light-emitting diode (SLED) light source or spontaneous emission (ASE) light source based on doped fiber, which is transmitted to the fiber sensor through a directional coupler. Generally, the ...

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Problems solved by technology

[0005] In short, due to the loss caused by the structure of the optical fiber sensing itself and the loss caused by the broadband light source being filtered by the FBG, the existing optical fiber sensing system: (1) Spectral analysis and processing are more difficult and costly; (2) ) Multi-channel cascading cannot be realized

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