Photonics Research Center, School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
Opt Lett. 2011 Jun 15;36(12):2197-9. doi: 10.1364/OL.36.002197.
A refractive index (RI) sensor based on a novel fiber structure that consists of a single-mode-multimode-single-mode (SMS) fiber structure followed by a fiber Bragg grating was demonstrated. The multimode fiber in the SMS structure excites cladding modes within output single-mode fiber (SMF) and recouple the reflected cladding Bragg wavelength to the input SMF core. By measuring the relative Bragg wavelength shift between core and cladding Bragg wavelengths, the RI can be determined. Experimentally we have achieved a maximum sensitivity of 7.33 nm/RIU (RI unit) at RI range from 1.324 to 1.439.
一种基于新型光纤结构的折射率（RI）传感器得到了演示，该光纤结构由单模-多模-单模（SMS）光纤结构和光纤布拉格光栅组成。SMS 结构中的多模光纤激发出输出单模光纤（SMF）中的包层模式，并将反射的包层布拉格波长重新耦合到输入 SMF 芯中。通过测量芯和包层布拉格波长之间的相对布拉格波长位移，可以确定 RI。实验中，在 RI 范围为 1.324 到 1.439 时，我们实现了最大 7.33nm/RIU（RI 单位）的灵敏度。
