Spectral bandwidth analysis of high sensitivity refractive index sensor based on multimode interference fiber device

Edwin G. P. Pachon; Marcos A. R. Franco; Cristiano M. B. Cordeiro

doi:10.1117/12.969928

7 November 2012 Spectral bandwidth analysis of high sensitivity refractive index sensor based on multimode interference fiber device

Edwin G. P. Pachon, Marcos A. R. Franco, Cristiano M. B. Cordeiro

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84217Q (2012) https://doi.org/10.1117/12.969928
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

Fiber optic structures based on multimode interference were investigated to the refractive index (RI) sensing. The proposed device is a singlemode-multimode-singlemode (SMS) structure, where the multimode section is a coreless fiber (MMF). The numerical analyses were carried out by beam propagation and modal expansion methods. Ultra-high sensitivity was obtained: 827 nm/RIU over a RI range of 1.30-1.44 and a maximum sensitivity of 3500 nm/RIU for RI~1.43, considering ▵_RI = 0.01. The dependence of spectral bandwidth was investigated taking into account the multimode fiber diameter and the coupling efficiency between modes at the input junction singlemode-multimode.

Citation Download Citation

Edwin G. P. Pachon, Marcos A. R. Franco, and Cristiano M. B. Cordeiro "Spectral bandwidth analysis of high sensitivity refractive index sensor based on multimode interference fiber device", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84217Q (7 November 2012); https://doi.org/10.1117/12.969928

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