title: Twin core photonic crystal fiber for in-line Mach-Zehnder interferometric sensing applications.
abstract: We will discuss fabrication of twin core photonic crystal fiber (TC-PCF) using the stack-and-draw method and its application for in-line Mach-Zehnder interferometers. The small difference in the effective indexes of the two core modes leads to interference fringes and the birefringence of the twin cores results in polarization-dependent fringe spacing. The strain sensitivity was negative and wavelength-dependent. A novel intensity-based bend sensor is also demonstrated with bend-induced spatial fringe shift. High air filling fraction of fabricated TC-PCF cladding provides immunity to bend-induced intensity fluctuation.
authors.affiliation: Department of Information and Communications, School of Photon Science and Technology, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.
authors.forename: Bongkyun
authors.initials: B
authors.lastname: Kim
authors.forename: Tae-Hoon
authors.initials: TH
authors.lastname: Kim
authors.forename: Long
authors.initials: L
authors.lastname: Cui
authors.forename: Youngjoo
authors.initials: Y
authors.lastname: Chung