In-fiber modal interferometer for high sensitivity gas detection

Fan Yang; Wei Jin

doi:10.1117/12.2194864

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28 September 2015 In-fiber modal interferometer for high sensitivity gas detection

Fan Yang, Wei Jin

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Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963410 (2015) https://doi.org/10.1117/12.2194864
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

We demonstrate a gas sensor based on mode interference in a hollow-core photonic bandgap fiber. Gas absorption of a pump laser beam induces phase modulation of a propagating probe beam, which is detected by use of an in-fiber modal interferometer. An estimated detection limit of ~2 ppm acetylene (~7x10^-5 in terms of noise equivalent absorbance or NEA) is achieved with 30-cm-long HC-PBF operating at the near infrared wavelength. This NEA is ~22 times better than state-of-the-art HC-PBF gas sensors based on direct absorption spectroscopy.

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Fan Yang and Wei Jin "In-fiber modal interferometer for high sensitivity gas detection", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963410 (28 September 2015); https://doi.org/10.1117/12.2194864

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