title: Adiabatically tapered microstructured mode converter for selective excitation of the fundamental mode in a few mode fiber.
abstract: We propose a new technique to selectively excite the fundamental mode in a few mode fiber (FMF). This method of excitation is made from a single mode fiber (SMF) which is inserted facing the FMF into an air-silica microstructured cane before the assembly is adiabatically tapered. We study theoretically and numerically this method by calculating the effective indices of the propagated modes, their amplitudes along the taper and the adiabaticity criteria, showing the ability to achieve an excellent selective excitation of the fundamental mode in the FMF with negligible loss. We experimentally demonstrate that the proposed solution provides a successful mode conversion and allows an almost excellent fundamental mode excitation in the FMF (representing 99.8% of the total power).
authors.forename: Aymen Belhadj
authors.initials: AB
authors.lastname: Taher
authors.forename: Philippe
authors.initials: P
authors.lastname: Di Bin
authors.forename: Faouzi
authors.initials: F
authors.lastname: Bahloul
authors.forename: Etienne
authors.initials: E
authors.lastname: Tartaret-Josnière
authors.forename: Mathieu
authors.initials: M
authors.lastname: Jossent
authors.forename: Sébastien
authors.initials: S
authors.lastname: Février
authors.forename: Rabah
authors.initials: R
authors.lastname: Attia