Analysis of mode transitions in a long-period fiber grating with a nano-overlay of diamond-like carbon

D. Brabant; M. Koba; Mateusz Smietana; Wojtek J. Bock

doi:10.1117/12.2075392

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25 September 2014 Analysis of mode transitions in a long-period fiber grating with a nano-overlay of diamond-like carbon

D. Brabant, M. Koba, Mateusz Smietana, Wojtek J. Bock

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Proceedings Volume 9288, Photonics North 2014; 928810 (2014) https://doi.org/10.1117/12.2075392
Event: Photonics North 2014, 2014, Montréal, Canada

Abstract

This work presents optimization analysis of the sensitivity to variations of the external refractive index (RI) of long-period fiber grating (LPFG) coated with a nano-overlay of diamond-like carbon (DLC) material. Through numerical simulations, we have shown that both the dual-resonance and mode transition phenomena can be simultaneously exploited to substantially increase the sensitivity to variations of the external RI. The tuning of the DLC layer thickness to displace the dual-resonance band into a more suitable region of the spectrum is also reported. To perform this analysis, we implemented a novel pseudo-heuristic simulation model based on a 4-layer step-index fiber layer model and coupled mode theory. The dispersion dependence on the DLC overlay thickness was modeled from experimental data. LPFG parameters were fitted to an experimental transmission spectrum. The simulation model and the obtain results provides guidance for the fabrication of the device.

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D. Brabant, M. Koba, Mateusz Smietana, and Wojtek J. Bock "Analysis of mode transitions in a long-period fiber grating with a nano-overlay of diamond-like carbon", Proc. SPIE 9288, Photonics North 2014, 928810 (25 September 2014); https://doi.org/10.1117/12.2075392

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