High-speed free-space optical communication systems have recently used fiber-optic components. The received laser beam in such a system must be coupled into a single-mode fiber at the input of the receiver module. However, propagation through atmospheric turbulence degrades the spatial coherence of a laser beam and limits the fiber-coupling efficiency. We numerically evaluate the fiber-coupling efficiency for laser light distorted by atmospheric turbulence. We also investigate the use of a coherent fiber array as a receiver structure and find that a coherent fiber array that consists of seven subapertures would significantly increase the fiber-coupling efficiency.
© Optical Society of America
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.3310) Atmospheric and oceanic optics : Laser beam transmission
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(060.4510) Fiber optics and optical communications : Optical communications
Yamaç Dikmelik and Frederic M. Davidson, "Fiber-coupling efficiency for free-space optical communication through atmospheric turbulence," Appl. Opt. 44, 4946-4952 (2005)