title: Free-space to few-mode-fiber coupling under atmospheric turbulence.
abstract: High speed free space optical communication (FSOC) has taken advantages of components developed for fiber-optic communication systems. Recently, with the rapid development of few-mode-fiber based fiber communication systems, few-mode-fiber components might further promote their applications in FSOC system. The coupling efficiency between free space optical beam and few-mode fibers under atmospheric turbulence effect are investigated in this paper. Both simulation and experimental results show that, compared with single-mode fiber, the coupling efficiencies for a 2-mode fiber and a 4-mode fiber are improved by ~4 dB and ~7 dB respectively in the presence of medium moderate and strong turbulence. Compared with single-mode fiber, the relative standard deviation of received power is restrained by 51% and 66% respectively with a 4-mode and 2-mode fiber.
authors: Donghao
authors: D
authors: Zheng
authors: Yan
authors: Y
authors: Li
authors: Erhu
authors: E
authors: Chen
authors: Beibei
authors: B
authors: Li
authors: Deming
authors: D
authors: Kong
authors: Wei
authors: W
authors: Li
authors: Jian
authors: J
authors: Wu