30 November 2012 Characteristics of in-fiber Mach-Zehnder interferometer formed by lateral offset splicing
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We present an in-fiber Mach-Zehnder type interferometer (MZI) in single mode fiber based on lateral offset splicing technique. The MZI relies on the interference between the fundamental core mode and a co-propagating cladding mode. To build an in-fiber MZI, we need one element or device which excites two co-propagating modes and another one to recombine them. In our case, the excitation and recombination of modes is realized by two cascaded lateral offset splicing joints. The effects of the lateral offset amount, the interferometer cavity length, and the fusion splicing parameters on the property and performance of the in-fiber MZI were investigated experimentally. By choosing an appropriate lateral offset amount, the MZIs with good interference fringe contrast and low insertion loss can be fabricated. Several in-fiber MZIs with different interferometer lengths were built and it is found that the interference peak wavelength spacing is inversely proportional to the interferometer length L. The potential applications of the proposed in-fiber MZI were further investigated as strain sensors.
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Xiujuan Yu, Ge Li, Shengchun Liu, Jintao Zhang, Xuefeng Chen, Liying Zhang, Yanbiao Liao, "Characteristics of in-fiber Mach-Zehnder interferometer formed by lateral offset splicing", Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 85611P (30 November 2012); doi: 10.1117/12.981889; https://doi.org/10.1117/12.981889

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