title: Simple and reliable light launch from a conventional single-mode fiber into a helical-core fiber through an adiabatically tapered splice.
abstract: We propose a simple and efficient light launch scheme for a helical-core fiber (HCF) by using an adiabatically tapered splice technique, through which we overcome its inherent difficulty with light launch owing to the large lateral offset and angular tilt of its core. We experimentally demonstrate single-mode excitation in the HCF in this configuration, which yields the coupling efficiency of around -5.9 dB (26%) for a ~1.1-μm light input when the splice joint is tapered down to 30 μm in diameter. To our knowledge, this is the first proof-of-principle report on the fusion-splice coupling between an HCF and a conventional single-mode fiber.
authors.affiliation: Laser Engineering and Applications Laboratory, Department of Electrical and Computer Engineering, Seoul National University, Seoul 151-744, Korea.
authors.forename: Hyuntai
authors.initials: H
authors.lastname: Kim
authors.forename: Jongki
authors.initials: J
authors.lastname: Kim
authors.forename: Yongmin
authors.initials: Y
authors.lastname: Jung
authors.forename: Luis Alonso
authors.initials: LA
authors.lastname: Vazquez-Zuniga
authors.forename: Seung Jong
authors.initials: SJ
authors.lastname: Lee
authors.forename: Geunchang
authors.initials: G
authors.lastname: Choi
authors.forename: Kyunghwan
authors.initials: K
authors.lastname: Oh
authors.forename: Pu
authors.initials: P
authors.lastname: Wang
authors.forename: W A
authors.initials: WA
authors.lastname: Clarkson
authors.forename: Yoonchan
authors.initials: Y
authors.lastname: Jeong