Title: A refractive index sensor of PCF Mach-Zehnder interferometer based on CO_2 laser fusion technology
Abstract: Based on the CO2 laser fusion technology and mode interference principle,a collapsed photonic crystal fiber(PCF)Mach-Zehnder interferometer(MZI)is proposed and experimentally demonstrated.By changing the structure of PCF′s cladding air holes,the Mach-Zehnder interferometer is realized by CO2 laser fusion method,and the interference happens between cladding mode and core mode.Using the microscope to measure the PCF sensor,it can be obtained that the length of collapse area is 419.01μm,and the smallest diameter of this area is 58.69μm.The interference fringe contrast of the transmission spectra can be up to 10.6dB and the temperature sensor and refractive index sensing characteristics are studied and analyzed.The fabricated Mach-Zehnder interferometer based on PCF is placed in the temperature control cabinet and glycerin aqueous solution with different refractive indices respectively,with both ends of it connected with an amplified spontaneous emission(ASE)source and a spectrometer,respectively.The output power of light source is 16 dBm.Therefore,a transmission spectrum can be obtained.Moreover,the temperature and refractive index sensing characteristics are studied.The experimental results show that the temperature sensitivity is only 0.005 1nm/℃in the range of 30-70℃,and the refractive index sensitivity is 33.388 4nm/RIU in the range of 1.3525-1.413 4.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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