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Fiber Bragg grating inscription in few-mode highly birefringent microstructured fiber

机译:少模高双折射微结构光纤中的布拉格光栅刻记

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摘要

In this Letter, we present the technology of fiber Bragg grating (FBG) inscription in highly birefringent (HB) few-mode microstructured fibers (MSFs) with two different (nanosecond and femtosecond) lasers in a Talbot interferometer setup. The spectral characteristics of FBGs written in the core region of the investigated fiber, with particular modes represented by dual peaks, are presented and discussed. Furthermore, we calculate the fundamental fiber parameters (mode effective refractive index and phase modal birefringence) from the spectral characteristics and show very good agreement with the performed numerical fiber characterization. We expect the results of our experiments to be very useful in future development of FBG sensors based on novel HB MSFs, with enhanced strain sensitivity of higher-order modes.
机译:在这封信中,我们介绍了在Talbot干涉仪中使用两个不同(纳秒和飞秒)激光器的高双折射(HB)少模微结构光纤(MSF)中的光纤布拉格光栅(FBG)铭刻技术。介绍并讨论了写入被研究光纤芯区的FBG的光谱特性,其中特定模式由双峰表示。此外,我们从光谱特性计算出基本的光纤参数(模式有效折射率和相模双折射),并与所进行的数值光纤表征非常吻合。我们希望我们的实验结果对基于新型HB MSF的FBG传感器的未来开发非常有用,并具有更高阶模式的应变敏感性。

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