Increased sensitivity of long period grating hydrogen sensors through coupling to higher order cladding modes

Richard M. Carter; Robert R. J. Maier; Palas Biswas; Somnath Bandyopadhyay; Nandini Basumallick; Benjamin J. S. Jones; Scott McCulloch; James S. Barton

doi:10.1117/12.975217

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7 November 2012 Increased sensitivity of long period grating hydrogen sensors through coupling to higher order cladding modes

Richard M. Carter, Robert R. J. Maier, Palas Biswas, Somnath Bandyopadhyay, Nandini Basumallick, Benjamin J. S. Jones, Scott McCulloch, James S. Barton

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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84216I (2012) https://doi.org/10.1117/12.975217
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

We investigate the phase matching conditions and sensitivities of higher order metal jacketed long period gratings (LPGs). These higher order modes have been previously demonstrated to have flatter, and therefore more sensitive, phase matching conditions leading up to the phase matching turning point. We demonstrate this increased sensitivity as applied to a Pd jacketed LPG hydrogen sensor illustrating an improvement in both the refractive index and temperature sensitivity (of the 17^th order mode) of an order of magnitude over the lower order (1^st-9^th) modes.

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Richard M. Carter, Robert R. J. Maier, Palas Biswas, Somnath Bandyopadhyay, Nandini Basumallick, Benjamin J. S. Jones, Scott McCulloch, and James S. Barton "Increased sensitivity of long period grating hydrogen sensors through coupling to higher order cladding modes", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216I (7 November 2012); https://doi.org/10.1117/12.975217

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