Highly versatile in-reflection photonic crystal fibre interferometer

Rajan Jha; Joel Villatoro; Mark Kreuzer; Vittoria Finazzi; Valerio Pruneri

doi:10.1117/12.835390

5 October 2009 Highly versatile in-reflection photonic crystal fibre interferometer

Rajan Jha, Joel Villatoro, Mark Kreuzer, Vittoria Finazzi, Valerio Pruneri

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 750356 (2009) https://doi.org/10.1117/12.835390
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

We report a simple and highly versatile photonic crystal fiber (PCF) interferometer that operates in reflection mode. The device consists of a short section of PCF fusion spliced at the distal end of a standard single mode fiber. The air-holes of the PCF are intentionally collapsed over a microscopic region around the splice. The collapsed region broadens the propagating mode because of diffraction. This allows the coupling and recombination of two PCF modes. Depending on the PCF structure two core modes or a core and a cladding mode can be excited. In either case the devices exhibit sinusoidal interference patterns with fringe spacing depending on the PCF length. The interferometers are highly stable over time and can operate at high temperatures with minimal degradation. The interferometers are suitable for highresolution sensing of strain, refractive index (biosensing), gases, volatile organic compounds, etc.

Citation Download Citation

Rajan Jha, Joel Villatoro, Mark Kreuzer, Vittoria Finazzi, and Valerio Pruneri "Highly versatile in-reflection photonic crystal fibre interferometer", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750356 (5 October 2009); https://doi.org/10.1117/12.835390

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