Abstract
A high-temperature sensor based on a Mach-Zehnder interferometer (MZI) in a conventional single-mode optical fiber is proposed and fabricated by concatenating two microcavities separated by a middle section. A femtosecond laser is used to fabricate a microhole on the center of a fiber end. Then a micro-air-cavity is formed by splicing the microholed fiber end with a normal fiber end. The interferometer is applied for high-temperature sensing, in the range of 500-1200 °C, with a sensitivity of 109pm/°C that, to the best of our knowledge, is highest in silica fiber temperature sensors. Also, the interferometer is insensitive to external refractive index (RI), which is desirable for temperature sensors.
Original language | English |
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Pages (from-to) | 3753-3755 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 36 |
Issue number | 19 |
DOIs | |
Publication status | Published - 1 Oct 2011 |