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

Lu, Ping and Men, Liqiu and Sooley, Kevin and Chen, Quiying (2009) Tapered fiber Mach–Zehnder interferometer for simultaneous measurement of refractive index and temperature. Applied Physics Letters, 94 (13). pp. 1-3. ISSN 1077-3118

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Abstract

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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