Spatial light coupled into a single-mode fiber by a Maksutov–Cassegrain antenna through atmospheric turbulence

Abstract

Maksutov–Cassegrains are widely used in free-space optical communication. The coupling efficiency and variance of a Maksutov–Cassegrain fiber (single-mode) system distorted by atmospheric turbulence are numerically evaluated using second-order and fourth-order moments under a Von Karman spectrum. Considering the limited cost and size of the equipment, the Maksutov–Cassegrain aperture should satisfy DA/ρS≈7 (ρS approximates the characteristic atmospheric coherence length), and the obscuration ratio should be no more than 0.2.