Nonadiabatic fiber taper-based Mach-Zehnder interferometer for refractive index sensing
2012; American Institute of Physics; Volume: 101; Issue: 15 Linguagem: Inglês
10.1063/1.4759041
ISSN1520-8842
AutoresLinlin Xu, Ying Li, Baojun Li,
Tópico(s)Advanced Fiber Laser Technologies
ResumoA Mach-Zehnder interferometer based on a nonadiabatic fiber taper is proposed for refractive index (RI) sensing. Only the first order cladding guided mode is excited in the down-taper. The radius of the fiber core in the interference region is too thin (<1.64 μm) to confine the fundamental mode in the fiber core, the fundamental core guided mode is converted to the fundamental cladding guided mode and interference occurs between it and the first order cladding guided mode. The sensitivity of the sensor is 980 nm per refractive index unit for the surrounding refractive index ranging from 1.332 to 1.392.
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