École de technologie supérieure, Department of Electrical Engineering, Montreal, H3C 1K3, Canada.
Center for Optics, Photonics and Lasers (COPL), Université Laval, Québec, QC, G1V 0A6, Canada.
Sci Rep. 2017 May 8;7(1):1552. doi: 10.1038/s41598-017-01621-7.
In this work, we demonstrate the measurement of the Brillouin gain spectra of vector modes in a few-mode fiber for the first time using a simple heterodyne detection technique. A tunable long period fiber grating is used to selectively excite the vector modes supported by the few-mode fiber. Further, we demonstrate the non-destructive measurement of the absolute effective refractive indices (n ) of vector modes with ~10 accuracy based on the acquired Brillouin frequency shifts of the modes. The proposed technique represents a new tool for probing and controlling vector modes as well as modes carrying orbital angular momentum in optical fibers with potential applications in advanced optical communications and multi-parameter fiber-optic sensing.
在这项工作中，我们首次使用简单的外差探测技术演示了在多模光纤中测量矢量模式的布里渊增益谱。可调谐长周期光纤光栅用于选择性地激发多模光纤中支持的矢量模式。此外，我们还演示了基于所获得的模式布里渊频移，以约 10 的精度对矢量模式的绝对有效折射率（n_e）进行无损测量。所提出的技术代表了一种用于探测和控制光纤中矢量模式以及携带轨道角动量模式的新工具，在先进的光通信和多参数光纤传感中有潜在的应用。
