切趾函数光纤布拉格光栅的光谱特性研究

Study on spectral characteristics of apodization function fiber Bragg grating

均匀光纤布拉格光栅(fiber Bragg grating,FBG)的反射谱存在旁瓣干扰,对波长解调过程会产生一定干扰,从而对传感测量结果造成一定误差。在FBG中引入切趾函数能够解决这一问题,有效抑制旁瓣。通过对切趾函数FBG耦合模理论的分析,获得了光栅参数变化对切趾FBG反射谱的作用情况。仿真实验结果表明,加入切趾函数会对FBG反射谱的旁瓣数量及大小起到明显抑制作用,反射率、中心波长、半高宽度及检测精度等反射谱特性的变化情况会受到光栅参数的影响。

There is the sidelobe interference in the reflection spectrum of uniform fiber Bragg grating(FBG),which will interfere with the wavelength demodulation process and cause certain errors to the sensing measurement results.Introducing apodization function into FBG can solve this problem and effectively inhibit sidelobes.Through the analysis of apodization function FBG coupled mode theory,the effect of variations of grating parameters on apodization FBG reflection spectrum is obtained.The simulation experiment results show that the addition of apodization function can significantly inhibit the number and size of sidelobes of FBG reflection spectrum,and the variations of reflection spectrum characteristics such as reflectivity,center wavelength,full width at half maximum and detection accuracy will be influenced by grating parameters.