All-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing

• 作者: 孙将 康泽新 简水生 马林 齐艳辉
• 来源期刊: 中国物理B（英文版）
• 关键词: curvature sensor up-taper core-offset modal interferometer
• 年，卷（期）: 2015,（4）
• 页码范围: 044202-1-044202-4
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/4/044202

摘要

A high-sensitivity curvature sensor based on an up-taper-core-offset structure is proposed and demonstrated in this paper. Here two specially designed cascaded up-tapers with maximum diameters of 247 μm and 251 μm, respectively, are used as a cladding mode exciting component. The excited cladding modes will propagate in the cladding and re-couplers with the core mode at the core-offset jointing point. When the curvature is changed, the dip wavelength of the sensor will shift to a blue wavelength and an average curvature sensitivity of more than?12.5 nm/m?1 is achieved within the measured curvature intervals.