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

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 str...

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Bibliographic Details
Published in:Optics letters 2012-02, Vol.37 (3), p.302-304
Main Authors: Lee, Cheng-Ling, Lin, Kuo-Hsiang, Lin, Yuanyao, Hsu, Jui-Ming
Format: Article
Language:English
Subjects:
Dipping
Dispersions
Fibers
Interferometers
Interferometry - instrumentation
Joining
Light
Optical Fibers
Refractometry - methods
Sensors
Tuning
Wavelengths
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Summary: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 50 nm/°C and an excellent sensitivity to RI of 113,500 nm per RI unit.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.000302