Rosenthal Amir, Horowitz Moshe
Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000 Israel.
J Opt Soc Am A Opt Image Sci Vis. 2004 Apr;21(4):552-60. doi: 10.1364/josaa.21.000552.
We demonstrate an inverse scattering algorithm for reconstructing the structure of lossy fiber Bragg gratings. The algorithm enables us to extract the profiles of the refractive index and the loss coefficient along the grating from the grating transmission spectrum and from the reflection spectra, measured from both sides of the grating. Such an algorithm can be used to develop novel distributed evanescent-wave fiber Bragg sensors that measure the change in both the refractive index and the attenuation coefficient of the medium surrounding the grating. The algorithm can also be used to analyze and to design fiber Bragg gratings written in fiber amplifiers. A novel method to overcome instability problems in extracting the parameters of the lossy grating is introduced. The new method also makes it possible to reduce the spectral resolution needed to accurately extract the grating parameters.
我们展示了一种用于重建有损光纤布拉格光栅结构的逆散射算法。该算法使我们能够从光栅透射光谱以及从光栅两侧测量的反射光谱中提取沿光栅的折射率和损耗系数分布。这样的算法可用于开发新型分布式倏逝波光纤布拉格传感器，以测量光栅周围介质的折射率和衰减系数的变化。该算法还可用于分析和设计写入光纤放大器中的光纤布拉格光栅。介绍了一种克服提取有损光栅参数时不稳定性问题的新方法。这种新方法还使得降低准确提取光栅参数所需的光谱分辨率成为可能。
