Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 22, Issue 1, Pages 39-41Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2009.2035638
Keywords
High-temperature; Mach-Zehnder interferometer (MZI); optical fiber sensors
Funding
- Hong Kong SAR Government through a GRF (general research fund) [PolyU 5306/08E]
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A miniaturized single fiber in-line Mach-Zehnder interferometer is proposed for high-temperature sensing. The interferometer has a microcavity in one of its arms, formed by removing part of the fiber core and cladding, while the other arm remains in the fiber core. Because the fiber core exhibits a temperature coefficient of refractive index which is different from that of air, the interferometer is sensitive to temperature variation. The microcavity structured interferometer also has excellent sustainability to high temperatures up to 1100 degrees C. The system is compact, reliable and can detect the temperature at precise location.
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