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An in-fiber Mach-Zehnder interferometer (MZI) for high-sensitive refractive index (RI) measurement is proposed and experimentally demonstrated. The sensing head is formed by a single-mode fiber (SMF) sandwiched between two short sections of thin-core fibers (TCFs), i.e., TCF-SMF-TCF MZI configuration with a length of 9 mm. A well-defined interference pattern is obtained as the result of fiber-core mismatch and core-cladding modes interference. The selected interference dip is extremely sensitive to ambient RI, providing a stable RI response with sensitivity up to 159 nm/RIU for water-based solutions close to the RI of 1.33, making it a good candidate for bio-chemical measurements.
Published in:
Sensors Journal, IEEE
(Volume:12
,
Issue:
7
)
Date of Publication: July 2012
- Page(s):
- 2501 - 2505
- ISSN :
- 1530-437X
- INSPEC Accession Number:
- 12768248
- Digital Object Identifier :
- 10.1109/JSEN.2012.2194700
- Product Type:
- Journals & Magazines
- Date of Publication :
- 13 April 2012
- Date of Current Version :
- 01 June 2012
- Issue Date :
- July 2012
- Sponsored by :
- IEEE Sensors Council
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