A simple interrogation technique for refractive index measurement using multimode interference structure

Susana Silva; O. Frazão; J. L. Santos; F. X. Malcata

doi:10.1117/12.890150

26 July 2011 A simple interrogation technique for refractive index measurement using multimode interference structure

Susana Silva, O. Frazão, J. L. Santos, F. X. Malcata

Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80011I (2011) https://doi.org/10.1117/12.890150
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal

Abstract

A simple interrogation technique for refractive index measurement is proposed, using a multimode interference-based fiber tip structure. The fiber probe is a section of a multimode fiber, spliced to a single-mode fiber and interrogated in reflection. The interrogation technique uses two fiber Bragg gratings as discrete optical sources; by means of relative intensity variation of the reflected signals, those sources will provide a measurement of refractive index changes, while taking advantage of the MMI-based fiber tip. The read-out system uses a WDM and two photodetectors to separate both signals. A sensitivity of -5.87/RIU, in the refractive index range 1.30- 1.38, was achieved with the proposed configuration.

Citation Download Citation

Susana Silva, O. Frazão, J. L. Santos, and F. X. Malcata "A simple interrogation technique for refractive index measurement using multimode interference structure", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80011I (26 July 2011); https://doi.org/10.1117/12.890150

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