Abstract-In-line single-mode tapered-fiber Mach-Zehnder interferometers (MZI-SMTF) with average waist diameters (davg) of 4.05 and 2.89 μm have been fabricated -and both the temperature and the humidity sensitivity of the surrounding media have been measured and compared. The humidity and temperature were measured over the ranges from 0% to 90% and 28 ºC to 40 ºC, respectively. The stability of the system at 50%RH and 90%RH were investigated while the temperature of the chamber was maintained at about 28 ºC. The humidity and temperature sensitivity resolution values were 0.02 nm/%RH and 0.05 nm/0.1ºC for the MZI-SMTF-1 with an average waist diameter of 4.05 μm -while they were 0.01 nm/%RH and 0.025 nm/0.1ºC for the MZI-SMTF-2 with an average waist diameter of 2.89 μm.
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