摘要
生产后期对半成品FBG阵列进行参数校正可有效降低成品FBG阵列的参数误差。分别应用光纤模式耦合理论和光傅里叶变换分析FBG阵列的频谱特性,比较半成品FBG阵列的频谱特性与目标特性的误差,通过VSLMS算法迭代更新FBG阵列的参数值,使其频谱特性不断接近理想曲线直至误差满足设置值。应用两种频谱分析方案分别对单FBG、二阶FBG及四阶FBG阵列的频谱特性进行分析,结果显示模式耦合理论分析比傅里叶变化分析性能更优,分别使FBG阵列制作误差降低至-43.6 dB、-33.6 dB、-24.6 dB,相比傅里叶变化分析分别提高了36.7 dB、30.4 dB、22.5 dB,其分析优化程度随着FBG阵列中FBG个数的增加而降低。
Parameters correction of the semi-finished FBG array at the later stage during production can effectively reduce the parameter error of the finished FBG array.Fiber mode coupling theory and optical Fourier transform analysis were applied to analyse the spectrum characteristics of FBG arrays respectively,so as to compare the error between the spectrum characteristics of semi-finished FBG arrays with the ideal characteristics of target FBG arrays.The parameter values of FBG arrays were iteratively updated by applying VSLMS algorithm,so that the curve of spectrum characteristics of semi-finished FBG arrays were adjusted to get close to the ideal curve until the error meets the set value,and the final error of the structure parameters were achieved to correct the parameters in the semi-finished FBG arrays.Two spectral analysis schemes were used to simulate the spectral characteristics of single,2 tap and 4 tap FBG arrays,respectively.The results showed that the optical mode coupling analysis has more precise performance,which reduced the fabrication error of FBG arrays to-43.6 dB,-33.6 dB,and-24.6 dB,respectively.Compared with the optical Fourier transform analysis,the error is decreased by 36.7 dB,30.4 dB,and 22.5 dB,respectively.Moreover,the degree of optimization decreases with the increase of the number of FBGs in FBG array.
作者
王小燕
邓翼强
郑联慧
WANG Xiao-yan;DENG Yi-qiang;ZHENG Lian-hui(College of Mechanical and Electrical Engineering,Sanming University,Sanming,365004;Modern Education Technical Center,Sanming University,Sanming,365004)
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2020年第10期1095-1100,共6页
Journal of Optoelectronics·Laser
基金
国家自然科学基金青年基金项目(11803015)
福建省教育厅中青年教育科研项目(JA15474)资助项目。
关键词
FBG阵列
参数检测
频谱特性
光模式耦合
光傅里叶变换分析
可变步长最小均方误差算法
FBG array
parameter detection
spectral characteristics
optical model coupling
optical Fourier transform analysis
variable step least mean square algorithm
