啁啾效应对Bragg波长匹配解调精度的影响和消除.pdfVIP

13 3 Vol. 13 No.3 2005 6 Optics and Precision Engineering Jun. 2005 1004924X( 2005) Bragg 庄其仁, 龚冬梅, 曾永西 ( 华侨大学 信息科学与工程学院, 福建泉州362021) :Bragg , , ( ) ,Bragg , Bragg : 光纤光栅; 匹配解调; 啁啾效应; 去卷积处理 :T N253 :A Influence of chirp effects on FBG wavelengthmatched demodulation precision and its elimination ZHUANG iren, GONG Dongmei, ZENG Yongxi (College of Inf ormation Science and Engineering, H uaqiao University , Quanz hou 362021, China) Abstract: T he principle of wavelengthmatched demodulation of fiber Bragg grating( FBG) is intro duced. The correlation functions of reflective spectra of sensor fiber grating and wavelengthmatched fiber grating are analyzed. T he correlation functions are linearity to photoelectric detector output sig nals. T he wavelengthmatched demodulation based on maximum correlation, extremum judgment of photodetector output signal, are only available for alike reflective spectra. When the peak value judg ment of photodetector output signal is adopted, chirp effects in the FBG sensor lead to demodulation error of Bragg wavelength. T heoretical analysis and experimental investigation show that the deconvo lution of photodetector output signal can eliminate Bragg wavelength demodulation error influenced by chirp effects in the FBG sensor. Key words: fiber Bragg grating; wavelengthmatched demodulation; chirp effect; deconvolution : :( No. 02 ZR03) ; (No. A0410019) 3 ,:Bragg 365 1 引 言 (FBG) Bragg Bragg FBG , , FP [19] , , Bragg ( a) , ,