A Novel Mach–Zehnder Interferometer Based on Hybrid Liquid Crystal–Photonic Crystal Fiber *Supported by the National Natural Science Foundation of China under Grant Nos U1531102, 61107059, 61308052 and U1331114, the 111 Project to the Harbin Engineering University under Grant No B13015, and the Fundamental Research Funds for the Central Universities. (December 2017)

• Record Type: Journal Article
• Authors: Luo 罗, Xian-Ping 先萍; Wang 王, Fei-Ru 斐儒; Chen 陈, Chun-Lei 春雷; Zhang 张, Ling-Li 伶莉; Wang 王, Lei 雷; Sun 孙, Wei-Min 伟民; Liu 刘, Yong-Jun 永军
• Is Part Of: Chinese physics letters. Volume 34:Number 12(2017:Dec.)
• Publication Date: 2017-12
• Subjects: 42.70.Df -- 42.25.Hz -- 42.81.Pa; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1088/0256-307X/34/12/124203
• Languages: English
• ISSNs: 0256-307X

Abstract

Abstract : We propose a novel all fiber Mach–Zehnder interferometer (MZI) based on photonic crystal fiber (PCF) filled with liquid crystal (LC). The interference between the core mode and the cladding modes of a PCF is utilized. To excite the cladding modes, a region is formed using fiber fusion splicer. Due to the fact that varying effective index difference between the core region and the LC-filled cladding region can cause different transmission spectra, we mainly study the MZIs with different LC-filled structures and different lengths of LC filling. The measured results demonstrate that quite clear interference spectra can be obtained. Through analysis spatial frequency spectrum and temperature spectrum of two MZIs with different LC-filled structures, we can obtain that the MZI with adjacent two LC-filled holes has clearer interference spectrum and higher temperature sensitivity. Thus we choose this MZI to measure the temperature sensitivity with different lengths of LC filling. When the length of LC filling is 2 cm, the temperature sensitivities can be enlarged to 1.59 nm/°C. The interferometer shows a good temperature tunability and sensitivity, which can be a good candidate for a highly tunable optical filtering and temperature sensing applications .