title: Validity of the V parameter for photonic quasi-crystal fibers.
abstract: We have investigated the validity of the V parameter to identify the single-mode operation regime for photonic quasi-crystal fibers. Our results show that the V parameter can be considered only for smoothly changing fibers. On the other hand, for fibers showing isolated high refractive regions around the core, only a mode area analysis can allow the estimation of the threshold for the single-mode operation regime. Finally, these findings can be generalized to any kind of optical fiber.
authors.affiliation: LaSUN, State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China.
authors.forename: Han
authors.initials: H
authors.lastname: Zhao
authors.forename: Remo
authors.initials: R
authors.lastname: Proietti Zaccaria
authors.forename: Prabhat
authors.initials: P
authors.lastname: Verma
authors.forename: Junfeng
authors.initials: J
authors.lastname: Song
authors.forename: Hongbo
authors.initials: H
authors.lastname: Sun