An in-fiber refractometer based on asymmetrical twin-core fiber

Yanhui Zhang; Ai Zhou; Guangping Li

doi:10.1117/12.905007

22 November 2011 An in-fiber refractometer based on asymmetrical twin-core fiber

Yanhui Zhang, Ai Zhou, Guangping Li

Proceedings Volume 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 819912 (2011) https://doi.org/10.1117/12.905007
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

We demonstrate a compact fiber Michelson interferometer for refractive index (RI) sensing which is composed of an asymmetrical twin-core fiber (TCF) with a central core and a side core. By chemical etching a segment of the TCF to make the side core is nearly exposed, the effective RI of the side core mode is sensitive to the RI change of the external medium. Therefore, the optical path length difference between the central and side cores will vary with the ambient refractive index, which leads to a shift of the transmission spectrum of the Michelson interferometer. The experimental results show that the device has a refractive index resolution of ~10^-5 in the range of 1.34-1.38.

Citation Download Citation

Yanhui Zhang, Ai Zhou, and Guangping Li "An in-fiber refractometer based on asymmetrical twin-core fiber", Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 819912 (22 November 2011); https://doi.org/10.1117/12.905007

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