Multiplexable high-temperature stable and low-loss intrinsic Fabry-Perot in-fiber sensors through nanograting engineering

Optics Express
Mohan WangKevin P Chen

Abstract

This paper presents a method of using femtosecond laser inscribed nanograting as low-loss- and high-temperature-stable in-fiber reflectors. By introducing a pair of nanograting inside the core of a single-mode optical fiber, an intrinsic Fabry-Perot interferometer can be created for high-temperature sensing applications. The morphology of the nanograting inscribed in fiber cores was engineered by tuning the fabrication conditions to achieve a high fringe visibility of 0.49 and low insertion loss of 0.002 dB per sensor. Using a white light interferometry demodulation algorithm, we demonstrate the temperature sensitivity, cross-talk, and spatial multiplexability of sensor arrays. Both the sensor performance and stability were studied from room temperature to 1000°C with cyclic heating and cooling. Our results demonstrate a femtosecond direct laser writing technique capable of producing highly multiplexable in-fiber intrinsic Fabry-Perot interferometer sensor devices with high fringe contrast, high sensitivity, and low-loss for application in harsh environmental conditions.

References

Dec 20, 2003·Physical Review Letters·Yasuhiko ShimotsumaKazuoki Hirao
Jul 11, 2005·Optics Express·Christopher SmelserDan Grobnic
Oct 17, 2007·Optics Express·Yun-Jiang RaoGuang-Hua Cheng
Mar 23, 2012·Sensors·Stephen J Mihailov
Feb 6, 2013·Optics Letters·Tao WangKevin Cook
Aug 14, 2013·Optics Letters·Rongzhang ChenKevin P Chen
Aug 15, 2014·Lab on a Chip·Moez HaquePeter R Herman
Feb 14, 2015·Optics Letters·Zhen ChenTao Wei
Jan 28, 2017·Scientific Reports·Michiru NishitaYasuhiro Minami

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