Influence of chirp effects on FBG wavelength- matched demodulation precision and it's elimination

ZHUANG Qi-ren; GONG Dong-mei; ZENG Yong-xi

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Influence of chirp effects on FBG wavelength- matched demodulation precision and it's elimination

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- Influence of chirp effects on FBG wavelength- matched demodulation precision and it's elimination
- Optics and Precision Engineering Vol. 13, Issue 3, Pages: 364-370(2005)
- 作者机构：
  
  华侨大学信息科学与工程学院,福建泉州,362021
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN253
- Received：20 November 2004，
  
  Revised：02 February 2005，
  
  Published Online：30 June 2005，
  
  Published：30 June 2005
- 稿件说明：
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ZHUANG Qi-ren, GONG Dong-mei, ZENG Yong-xi. Influence of chirp effects on FBG wavelength- matched demodulation precision and it's elimination[J]. Optics and precision engineering, 2005, 13(3): 364-370.
DOI：

ZHUANG Qi-ren, GONG Dong-mei, ZENG Yong-xi. Influence of chirp effects on FBG wavelength- matched demodulation precision and it's elimination[J]. Optics and precision engineering, 2005, 13(3): 364-370. DOI：

摘要

介绍了光纤光栅Bragg波长的匹配解调原理

分析了传感光纤光栅和匹配光纤光栅的反射谱相关函数

说明相关函数与光电探测器输出信号具有线性关系。指出基于最大相关原理(光电探测器输出信号极值判断法)的匹配解调只适用于两个光纤光栅具有相同的反射谱型。采用光电探测器输出信号峰值判读时

传感光纤光栅的啁啾效应会引起Bragg波长的解调误差。理论分析和实验研究表明

对光电探测器输出信号进行去卷积运算处理可以消除传感光纤光栅啁啾效应对Bragg波长解调精度的影响。

Abstract

The principle of wavelength-matched demodulation of fiber Bragg grating(FBG) is introduced. The correlation functions of reflective spectra of sensor fiber grating and wavelength-matched fiber grating are analyzed. The correlation functions are linearity to photoelectric detector output signals. The wavelength-matched demodulation based on maximum correlation

extremum judgment of photodetector output signal

are only available for alike reflective spectra. When the peak value judgment of photodetector output signal is adopted

chirp effects in the FBG sensor lead to demodulation error of Bragg wavelength. Theoretical analysis and experimental investigation show that the deconvolution of photodetector output signal can eliminate Bragg wavelength demodulation error influenced by chirp effects in the FBG sensor.

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references

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