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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 3 — Feb. 1, 2012
  • pp: 302–304

Widely tunable and ultrasensitive leaky-guided multimode fiber interferometer based on refractive-index-matched coupling

Cheng-Ling Lee, Kuo-Hsiang Lin, YuanYao Lin, and Jui-Ming Hsu  »View Author Affiliations


Optics Letters, Vol. 37, Issue 3, pp. 302-304 (2012)
http://dx.doi.org/10.1364/OL.37.000302


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Abstract

This investigation presents a simple, widely tunable, and ultrasensitive sensor that is based on a leaky-guided multimode fiber interferometer (MMFI) operated under refractive-index-matched coupling. By use of a material with an appropriate dispersion profile around the MMFI as a cladding yields strong index-matched coupling, which performs ultrasensitive sensing in variations of the surroundings. Index matching at a single wavelength yields a coupling wavelength dip with a narrow bandwidth and a high extinction ratio of over 25 dB. The wavelength dip can also be effectively tuned, greatly shifting with a variation in temperature (T) or refractive index (RI), when the index-matched condition is satisfied. This work demonstrates that the proposed sensor responds sensitively to T with an extremely high tuning efficiency of 50nm/°C and an excellent sensitivity to RI of 113,500 nm per RI unit.

© 2012 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(350.2460) Other areas of optics : Filters, interference

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: November 2, 2011
Revised Manuscript: December 1, 2011
Manuscript Accepted: December 3, 2011
Published: January 19, 2012

Citation
Cheng-Ling Lee, Kuo-Hsiang Lin, YuanYao Lin, and Jui-Ming Hsu, "Widely tunable and ultrasensitive leaky-guided multimode fiber interferometer based on refractive-index-matched coupling," Opt. Lett. 37, 302-304 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-3-302

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