Fiber grating sensing demodulation method and devices based on microwave photon filters

A fiber grating, microwave photonic technology, applied in the direction of using optical devices to transmit sensing components, optics, instruments, etc., can solve the problems of high cost, multi-optical filters, high performance requirements of optical filters, and reduce cost and complexity. Effect

Inactive Publication Date: 2009-09-23
ZHEJIANG UNIV
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Problems solved by technology

These methods either have higher requirements on the performance of the optical filter, and the cost is higher; or require more optical filters, the cost is high and the structure is complicated, and it is difficult to be practical

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  • Fiber grating sensing demodulation method and devices based on microwave photon filters

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Embodiment Construction

[0017] like figure 1 As shown, the structure of the fiber grating sensing demodulation device based on the microwave photonic filter is: the broadband light source 1 is optically connected to the first port of the three-port optical circulator 2, and the second port of the three-port optical circulator 2 is connected to the sensor One end of the fiber Bragg grating 3 is optically connected, the third port of the three-port optical circulator 2 is optically connected to the input end of the electro-optic modulator 5, the output end of the electro-optic modulator 5 is optically connected to the input end of the fiber amplifier 6, and the electro-optic modulator The electric drive port of 5 is electrically connected with the signal source 4, the output port of the optical fiber amplifier 6 is optically connected with the input port of the Sagnac ring, the output port of the Sagnac ring is optically connected with the input port of the photodetector 11, and the photoelectric The o...

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Abstract

The invention relates to a fiber grating sensing demodulation method and devices based on microwave photon filters. The method converts the wavelength drift quantity of sensing Fiber Bragg Grating into the strength variable quantity of electric signals with specific frequency by utilizing chirped fiber grating unequal-armed Sagnac circular structure and utilizing the filter action of the structure to the electric signals, thus demodulating the wavelength information. The devices for realizing the method comprise a broadband light source, a three-port optical circulator, a sending Fiber Bragg Grating, an electro-optical modulator, an optical fiber amplifier, a Sagnac ring, a photodetector and an electro-dynamometer; two ports of a 3-dB four-port optical fiber coupler are optically connected with the two ends of a linear chirped fiber grating by two-section optical fiber , and the other two ports thereof as used as the input port and the output port of the Sagnac ring. The invention changes the wavelength variable quantity of the fiber grating into the power variable quantity of modulation electric signals, thus implementing power detection to the demodulated electric signals and greatly reducing the cost and complexity of the demodulation system.

Description

technical field [0001] The invention belongs to the cross technical field of optical fiber sensing and microwave photonics, relates to fiber grating sensing demodulation technology, is especially suitable for the application field of low-cost demodulation schemes for fiber grating demodulation, and specifically relates to a microwave photon filter The invention relates to a device, a method for converting the wavelength change sensed by a fiber grating into a microwave signal size change, thereby demodulating the wavelength change of the fiber grating and a device for realizing the method. Background technique [0002] Fiber Bragg gratings are widely used in stress, temperature and refractive index sensing systems. In the field of fiber grating sensing, it is of great significance to develop methods and low-cost equipment for quickly demodulating the wavelength variation of fiber gratings. [0003] Traditional fiber grating demodulation methods often use optical filter demo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/30G01J1/42G02F1/35
Inventor 付宏燕何赛灵
Owner ZHEJIANG UNIV
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