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

A fiber optic sensing system and fiber laser technology, applied to lasers, measuring devices, laser components, etc., can solve the problems of increased difficulty in spectral analysis and processing, high cost, and inability to realize multi-channel cascading, so as to reduce processing difficulty , cost reduction, ingenious design effect

CN101593926AInactive Publication Date: 2009-12-02SHANGHAI BAIANTEK SENSING TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-12-02
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Examples

Embodiment Construction

[0028] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

[0029] see Figure 2-4 As shown, the wavelength scanning fiber laser device of the present invention includes at least one fiber amplifier, a scanning filter, a first directional coupler, a first fiber isolator and a second fiber isolator, the scanning filter, the first fiber The isolator, the fiber amplifier and the second fiber isolator are sequentially closed-loop connected to form a light wave passing loop, the first directional coupler is connected to the light wave passing loop, and the first directional coupling The device also has a scanning laser output. The first optical fiber isolator and the second optical fiber isolator are respectively connected to the input and output ends of the amplifier to ensure the one-way transmission and resonance of the laser in the ring cavity; the splitting ratio of the first directional coupler can ...