title: Intermodal interferometer based on a fluid-filled two-mode photonic crystal fiber for sensing applications.
abstract: A fluid-filled two-mode photonic crystal fiber (PCF)-based intermodal interferometer and its sensing characteristics are demonstrated and investigated. The interferometer works from the interference between LP(01) and LP(11) core modes of the fluid-filled PCF. Solutions to enhance the temperature sensitivity of the interferometer are also discussed. Via choosing a higher fluid-filled length ratio of PCF, a sensitivity of more than -340 pm/°C at 1480 nm is achieved, which is the highest value for a PCF intermodal interferometer-based sensor, to our best knowledge. Furthermore, there exist significant differences in temperature and strain sensitivity for two different interference dips, thus the interferometer can be used as a dual-parameter sensor with a compact structure through matrix demodulation.
authors.affiliation: Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China.
authors.forename: Shuangxia
authors.initials: S
authors.lastname: Wang
authors.forename: Yan-ge
authors.initials: YG
authors.lastname: Liu
authors.forename: Zhi
authors.initials: Z
authors.lastname: Wang
authors.forename: Tingting
authors.initials: T
authors.lastname: Han
authors.forename: Weicai
authors.initials: W
authors.lastname: Xu
authors.forename: Yunkun
authors.initials: Y
authors.lastname: Wang
authors.forename: Shangcheng
authors.initials: S
authors.lastname: Wang