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Fiber grating wavelength demodulating device based on saturable absorption fiber

A saturable absorption, fiber grating technology, applied in the demodulation of light, the use of optical devices to transmit sensing components, optics, etc., can solve the problems of unusability, high cost, complex structure, etc., and achieve easy maintenance, simple and convenient use. , the effect of small size

Active Publication Date: 2013-12-11
NORTHWEST INST OF NUCLEAR TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the need to use a large number of crystal optical devices in this type of demodulation device, its structure is complex, its cost is high, and it cannot be used in a vibration environment

Method used

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  • Fiber grating wavelength demodulating device based on saturable absorption fiber
  • Fiber grating wavelength demodulating device based on saturable absorption fiber
  • Fiber grating wavelength demodulating device based on saturable absorption fiber

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Embodiment Construction

[0028] Specific implementations of the present invention will be described below according to the annular cavity structure and the linear cavity structure respectively.

[0029] figure 1 Shown is a structural schematic diagram of the device of the present invention under the annular cavity structure. Such as figure 1 As shown, the novel fiber grating wavelength demodulation device based on the saturable absorbing fiber 5 of the present invention consists of a pumping source 1, a wavelength division multiplexer 2, a gain fiber 3, an isolator 4, a saturable absorbing fiber 5, and an output coupler 6 , a circulator 7, a fiber grating to be tested 8-a, and a photoelectric detection system 9.

[0030] First, the wavelength division multiplexer 2, the gain fiber 3, the isolator 4, the saturable absorption fiber 5, the output coupler 6 and the circulator 7 are connected by a fiber fusion splicer to form a fiber loop; the pump source 1 Connected on the optical fiber loop through th...

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Abstract

The invention discloses a fiber grating wavelength demodulating device based on a saturable absorption fiber. The device comprises a pumping source, a gain fiber, the saturable absorption fiber, a circulator, an annular cavity or linear cavity fiber laser formed by a fiber grating to be measured and a photoelectric detection system used for measuring the repetition frequency of lasers. By measuring the repetition frequency of the lasers, wavelength changes of the fiber grating to be measured are obtained through calculation, and wavelength demodulation is achieved. The fiber grating wavelength demodulating device based on the saturable absorption fiber avoids using spectral analysis equipment and thus lowers the wavelength demodulation cost. Meanwhile, an all-fiber demodulating system is obtained, the demodulating system is made to be small in size, easy to maintain and easy and convenient to use.

Description

technical field [0001] The invention relates to a fiber grating wavelength demodulation device, in particular to a novel fiber grating demodulation method and device based on a saturable absorbing optical fiber. Background technique [0002] Fiber Bragg grating sensing can realize the measurement of various physical quantities, and has the advantages of compact structure, easy maintenance, and immunity to electromagnetic interference, and has been widely used in engineering. [0003] The wavelength demodulation of FBG is one of the key technologies in FBG sensing applications. The commonly used demodulation methods include wavelength scanning method, F-P cavity filter method and dispersion demodulation method based on volume grating. [0004] The wavelength scanning method uses a wavelength-tunable laser as the light source. During the wavelength scanning process, when the wavelength is consistent with the central wavelength of the fiber Bragg grating to be demodulated, th...

Claims

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Application Information

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IPC IPC(8): G01D5/36G02F2/00
Inventor 陶蒙蒙叶锡生王振宝杨鹏翎陈绍武王平冯国斌
Owner NORTHWEST INST OF NUCLEAR TECH
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