Tapered fiber Mach–Zehnder interferometer for simultaneous measurement of refractive index and temperature

Ping Lu; Men, Liqiu; Sooley, Kevin; Qiying Chen
March 2009
Applied Physics Letters;3/30/2009, Vol. 94 Issue 13, p131110
Academic Journal
An approach to achieve simultaneous measurement of refractive index and temperature is proposed by using a Mach–Zehnder interferometer realized on tapered single-mode optical fiber. The attenuation peak wavelength of the interference with specific order in the transmission spectrum shifts with changes in the environmental refractive index and temperature. By utilizing S-band and C/L-band light sources, simultaneous discrimination of refractive index and temperature with the tapered fiber Mach–Zehnder interferometer is demonstrated with the corresponding sensitivities of -23.188 nm/RIU (refractive index unit) and 0.071 nm/ °C, and -26.087 nm/RIU (blueshift) and 0.077 nm/°C (redshift) for the interference orders of 169 and 144, respectively.


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