title: Broadband micro-Michelson interferometer with multi-optical-path beating using a sphered-end hollow fiber.
abstract: We demonstrate a high-sensitivity broadband (1250-1650 nm) fiber micro-Michelson interferometer using a single-mode fiber end-spliced with a sphered-end hollow-core fiber. The hollow core is slightly smaller than the solid core of a single-mode fiber, so the fractional power of the core mode is converted into cladding modes. The excited cladding modes propagate at distinct optical paths along the hollow-core fiber and have individual foci outside the spherical lens. The reflected core mode, generated at the solid core-air interface, and the reflected cladding modes, generated at external material, interfere with each other to produce beating in the interference signals.
authors.affiliation: Department of Electro-Optical Engineering, National United University, Miaoli, Taiwan 360. nankuang@gmail.com
authors.forename: Nan-Kuang
authors.initials: NK
authors.lastname: Chen
authors.forename: Kuan-Yi
authors.initials: KY
authors.lastname: Lu
authors.forename: Jow-Tsong
authors.initials: JT
authors.lastname: Shy
authors.forename: Chinlon
authors.initials: C
authors.lastname: Lin