Acta Photonica Sinica, Volume. 45, Issue 2, 206006(2016)
Refractive Index Sensing of InFiber MachZehnder Interferometer Based on Two Fiber Tapers
A kind of infiber MachZehnder interferometer based on fiber taper was proposed. The sensor is formed by cascaded two fusion tapers in singlemode fiber through a fusion splicer. The fiber taper has a diameter of 43.7 μm and length of 480 μm. The fiber taper acts as couplers, it could not only excite the highorder modes, but also couple these modes into singlemode fiber to form the intermodal interference. When surrounding refractive index and temperature of the surrounding liquid changes, the intermodal phase difference changes. Through monitoring the transmission spectrum of the interferometer, the refractive index and temperature were determined. The experimental results show that the sensor sensitivity is -128.33 nm/RIU in the RI range of 1.335~1.403RIU, and the temperature sensitivity is 0.111nm/℃ in the water temperature range of 30~75℃. The sensor has advantages of easy fabrication, high sensitivity, and inexpensive, which has a potential in biological sensing.
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ZHAO Xue, SHAO Min, QIAO Xueguang, FU Haiwei, JIA Zhenan. Refractive Index Sensing of InFiber MachZehnder Interferometer Based on Two Fiber Tapers[J]. Acta Photonica Sinica, 2016, 45(2): 206006
Received: Jul. 22, 2015
Accepted: --
Published Online: Apr. 1, 2016
The Author Email: Xue ZHAO (zhaoxuet108@xsyu.edu.cn)