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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 24 — Aug. 20, 2012
  • pp: 5941–5945

Multimode interference tapered fiber refractive index sensors

Claudecir R. Biazoli, Susana Silva, Marcos A. R. Franco, Orlando Frazão, and Cristiano M. B. Cordeiro  »View Author Affiliations


Applied Optics, Vol. 51, Issue 24, pp. 5941-5945 (2012)
http://dx.doi.org/10.1364/AO.51.005941


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Abstract

Real-time monitoring of the fabrication process of tapering down a multimode-interference-based fiber structure is presented. The device is composed of a pure silica multimode fiber (MMF) with an initial 125 μm diameter spliced between two single-mode fibers. The process allows a thin MMF with adjustable parameters to obtain a high signal transmittance, arising from constructive interference among the guided modes at the output end of the MMF. Tapered structures with waist diameters as low as 55 μm were easily fabricated without the limitation of fragile splices or difficulty in controlling lateral fiber alignments. The sensing device is shown to be sensitive to the external environment, and a maximum sensitivity of 2946 nm / refractive index unit in the refractive index range of 1.42–1.43 was attained.

© 2012 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: April 4, 2012
Revised Manuscript: June 27, 2012
Manuscript Accepted: July 6, 2012
Published: August 20, 2012

Citation
Claudecir R. Biazoli, Susana Silva, Marcos A. R. Franco, Orlando Frazão, and Cristiano M. B. Cordeiro, "Multimode interference tapered fiber refractive index sensors," Appl. Opt. 51, 5941-5945 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-24-5941


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