Combined long-period grating and micro-cavity in-line Mach-Zehnder interferometer for refractive index sensing

Monika Janik; Marcin Koba; Predrag Mikulic; Wojtek J. Bock; Mateusz Śmietana

doi:10.1117/12.2265961

23 April 2017 Combined long-period grating and micro-cavity in-line Mach-Zehnder interferometer for refractive index sensing

Monika Janik, Marcin Koba, Predrag Mikulic, Wojtek J. Bock, Mateusz Śmietana

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238R (2017) https://doi.org/10.1117/12.2265961
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

This work presents combined long-period grating (LPG) and a micro-cavity in-line Mach-Zehnder interferometer (μIMZI), both induced in the same single-mode optical fiber. In order to increase refractive index (RI) sensitivity of the LPG, it has been nanocoated with aluminum oxide (Al₂O₃). Next, the μIMZI has been fabricated as a cylindrical cavity (d = 60 μm) in the center of the LPG. In transmission measurements for various RI in the cavity and around the LPG we have observed two effects coming from two independently working sensors. There was no significant impact on one or the other in terms of their functional properties. Such a combination of sensorial effects can be applied for cross-reference measurements of the two different parameters at the same time or for discrimination of influence of other parameters on the RI measurements.

Citation Download Citation

Monika Janik, Marcin Koba, Predrag Mikulic, Wojtek J. Bock, and Mateusz Śmietana "Combined long-period grating and micro-cavity in-line Mach-Zehnder interferometer for refractive index sensing", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238R (23 April 2017); https://doi.org/10.1117/12.2265961

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