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Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof

A fiber grating, digital demodulation technology, applied in optical multiplexing systems, transmission systems, cladding fibers, etc., can solve the problems of sensitive initial parameters of the system and complex numerical solution process.

Inactive Publication Date: 2009-03-11
李东升
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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of the current fiber grating autocorrelation digital demodulation technology, such as complex numerical solution process and sensitivity to the initial parameters of the system, and provide a method that uses code division multiple access to realize fiber grating autocorrelation with the advantages of simple method and high measurement accuracy. Related digital demodulation method and system

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  • Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof
  • Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof
  • Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof

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Embodiment Construction

[0150] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0151] figure 1 Among them, it includes a broadband light source, the broadband light source is connected to the input end of the coupler I, one output end of the coupler I is connected to a group of measuring units composed of sensor gratings, and the other output end is connected to the coupler II; the coupler One output end of II is connected to the modulation grating, while the other output end is connected to the modulation grating through the feedback control unit.

[0152] The measuring unit consists of several sensor gratings connected in series or in parallel.

[0153] The feedback control unit includes a photodetector PD, which is matched with the coupler II. The photodetector PD is connected to the operational amplifier OP. The OP is connected to the computer through the analog-to-digital converter, and the computer is connected to the digit...

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Abstract

The invention discloses a method for realizing autocorrelation digital demodulation of fiber grating by adopting code division multiple access (CDMA) and a system thereof, which solve the problems that the present autocorrelation digital demodulation technology of the fiber grating has complex digital solution procedure and is sensitive to the system initial parameter, and the like. The invention has the advantages of simple method and high measuring accuracy, and the like. The system comprises a broad band light source which is connected with the input end of a coupler 1, one output end of the coupler 1 is connected with at least one group of measuring units comprising sensing gratings, and the other output end of the coupler 1 is connected with a coupler 2; one output end of the coupler 2 is connected with a modulated grating, and the other output end is connected with the modulated grating through a feedback control unit.

Description

technical field [0001] The invention relates to a method and system for realizing fiber grating self-correlation digital demodulation by using code division multiple access. Background technique [0002] Fiber Bragg grating sensor is a wavelength modulation device with compact structure and strong anti-interference ability. Machinery, medical treatment, aerospace, navigation, mining and many other fields have broad application prospects and have been greatly developed in recent years. [0003] At present, the theoretical research on fiber grating sensing has made great achievements, and the mature fiber grating manufacturing process has also enabled the fiber grating sensor to have small batch production capacity. How to reduce costs, improve demodulation and multiplexing technology, and meet engineering The requirements for high-precision applications have become an urgent problem to be solved. [0004] Fiber Bragg grating demodulation technology is a high-resolution dete...

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Application Information

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IPC IPC(8): H04J14/00H04B10/12G02B6/02
Inventor 李东升
Owner 李东升
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