Nawal Athirah Mustaffa, M. Mokhtar, Mohd Fahmi Azman, Z. Yusoff, H. Rashid, Zulkifi Mahmud
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In-line Fiber Mach-Zehnder Interferometer with Enhanced Strain Sensitivity Using Off-Axis Coating
This paper demonstrates a Mach-Zehnder interferometer (MZI) with enhanced strain sensitivity. Strain sensitivity enhancement is achieved by encapsulating the MZI with off-axis coating. Experiments comparing the off-axis with on-axis encapsulation reveals that the enhancement achieved is at least tenfold. Effect of various types of elastic coating is also investigated. The results show that softer coating with give a higher strain sensitivity. This technique offers a simple packaging to enhance any discrete fiber optic sensor.
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