Effect of fiber tapering in LPG-based Mach-Zehnder modal interferometers for refractive-index sensing

• Type: Article in International Conference Proceedings Book
• Date: 2009

Authors

Caldas, P (Author) Other; Jorge, PAS (Author) FCUP; Araujo, F (Author) Other; Ferreira, LA (Author) Other; Rego, G (Author) Other; Santos, JL (Author) FCUP

Conference proceedings International

Title: Proceedings of SPIE - The International Society for Optical Engineering

20th International Conference on Optical Fibre Sensors

Edinburgh, 5 October 2009 through 9 October 2009

Indexing

ISI Web of Knowledge

Scopus - 6 Citations

Other information

Authenticus ID: P-007-REX

DOI: 10.1117/12.834951

Abstract (EN): In this work, an LPG-based Mach-Zehnder modal interferometer with a tapered fiber section between the two LPGs is studied as a sensing structure for measuring environmental refractive index. To interrogate this sensing device, coherence addressing and pseudo-heterodyne processing were used. A fiber taper was made between the two LPGs to improve and tailor the sensitivity of the sensor. Experimental results show that the sensitivity to external refractive index increases with the length of the taper and that the sensitivity enhancement is stronger for lower order cladding modes. © 2009 SPIE.

Language: English

Type (Professor's evaluation): Scientific