title: Intermodal coupling of supermodes in a twin-core photonic crystal fiber and its application as a pressure sensor.
abstract: In this paper, we experimentally demonstrated the fabrication and hydrostatic pressure characteristics of a twin-core photonic crystal fiber (TC-PCF). Mode couplings in the TC-PCF for x- and y-polarizations were analyzed simultaneously using group effective index of guiding modes. The output spectrum of the TC-PCF was modulated due to the combined couplings of the two polarizations. To the best of our knowledge, it is the first time to measure hydrostatic pressure through the dual-polarization mode coupling in a TC-PCF. The measured sensitivity of the pressure sensor was -21 pm/MPa. The length of the TC-PCF used for pressure measurement was 20 cm, which is much shorter than pressure sensor based on PM-PCF, and does not require any external polarizing components, meaning that it is a good candidate for compact pressure sensor.
authors.affiliation: Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. springlzy@gmail.com
authors.forename: Zhengyong
authors.initials: Z
authors.lastname: Liu
authors.forename: Ming-Leung Vincent
authors.initials: ML
authors.lastname: Tse
authors.forename: Chuang
authors.initials: C
authors.lastname: Wu
authors.forename: Daru
authors.initials: D
authors.lastname: Chen
authors.forename: Chao
authors.initials: C
authors.lastname: Lu
authors.forename: Hwa-Yaw
authors.initials: HY
authors.lastname: Tam