Turning a low Q fiber resonator into a high-sensitivity displacement sensor using slow light concepts

Mikel Bravo; Xabier Angulo-Vinuesa; Sonia Martin-Lopez; Manuel Lopez-Amo; Miguel Gonzalez-Herraez

doi:10.1117/12.2026681

20 May 2013 Turning a low Q fiber resonator into a high-sensitivity displacement sensor using slow light concepts

Mikel Bravo, Xabier Angulo-Vinuesa, Sonia Martin-Lopez, Manuel Lopez-Amo, Miguel Gonzalez-Herraez

Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87942O (2013) https://doi.org/10.1117/12.2026681
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

Abstract

High-Q resonators have been widely used for sensing purposes. High Q factors normally lead to sharp spectral peaks which accordingly provide a strong sensitivity in spectral interrogation methods. In this work we employ a low-Q ring resonator to develop a high sensitivity sub-micrometric resolution displacement sensor. We use the slow-light effects occurring close to the critical coupling regime to achieve high sensitivity in the device. By tuning the losses in the cavity close to the critical coupling, extremely high group delay variations can be achieved, which in turn introduce strong enhancements of the absorption of the structure. We first validate the concept using an Optical Vector Analyzer (OVA) and then we propose a simple functional scheme for achieving a low-cost interrogation of this kind of sensors.

Citation Download Citation

Mikel Bravo, Xabier Angulo-Vinuesa, Sonia Martin-Lopez, Manuel Lopez-Amo, and Miguel Gonzalez-Herraez "Turning a low Q fiber resonator into a high-sensitivity displacement sensor using slow light concepts", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87942O (20 May 2013); https://doi.org/10.1117/12.2026681

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