光纤Bragg光栅F_P腔长测量的理论与实验研究_牛嗣亮.pdfVIP

!2010 12 3 1 6 牛嗣亮 等: 光纤Br agg 光栅FP 腔长测量的理论与实验研究 Bragg FP 牛嗣亮, 饶 伟, 马丽娜, 胡永明 ( , 410073) : 通过对F BG 和光纤Bragg 光栅FP 腔( F BGFP ) 的光谱特性分析, 得出了低反射率 的F BGF P 腔反射谱的双光束干涉近似表达式在 基础上, 讨论了拟合法周期法和傅里叶变换 3 种 FBGFP 腔长测量方法最后, 对实测光纤FBGF P 腔的反射谱进行了分析, 3 种方法得到了 相互验证, 腔长测量精度达0. 1 mm 量级 : Bragg ; FP ; : T N253 : A : 1001- 5868( 2010) 06- 0945- 04 Study on Cavity Length Measurement of Fi er Bragg Grating Fa ryPerot Cavity N IU S l ang, RA O We , M A L na, H U Y ongm ng ( College of Optoelectronic Science Engineering, National University of Defense Technology, Changsha 410073, CHN) A stract: Based o n analys ng t he spect ral character st cs of f ber Br ag g grat ng ( F BG) and f ber Brag g gr at ng F abryP ero t cav t y ( F BGF P ) , t he ex press on , n w h ch t he mult plebeam nt erference of FBGF P cav ty w th low ref lect v t y w as regarded as tw obeam nt erf erence appr ox m at ely, w as deduced . T hen f tt ng m et hod, per o d c method and F our er tr ansf orm method for measur ng the leng t h o f FP cav t y w ere d scu ssed . F nally a m easured reflect on spect rum of FBGFP cav ty w as analyzed, and t he three met hods w ere pr oved m ut ually w t h a resolut on of about 0. 1 mm . Key words: f ber Bragg g rat ng; FabryPerot cav t y; cav t y lengt h m easurement 0 FBG FP , F BGF P Brag g FP , , FBGFP ( FBGF P) , , FBG FP , [ 1] [ 2] 1 F BG F BGFP [ 3] , , [ 4] F BGF P FP , FP , FBG , F BG [ 1] , FBGF P , FP