Open AccessEvaluation of channel capacities of OAM-based FSO link with real-time wavefront correction by adaptive optics
Author(s) -
Ming Li,
Milorad Cvijetić,
Yuzuru Takashima,
Zhongyuan Yu
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.031337
Subject(s) - adaptive optics , wavefront , optics , deformable mirror , crosstalk , physics , channel (broadcasting) , atmospheric turbulence , phase (matter) , turbulence , computer science , monte carlo method , telecommunications , mathematics , statistics , quantum mechanics , thermodynamics
We have evaluated the channel capacity of OAM-based FSO link under a strong atmospheric turbulence regime when adaptive optics (AO) are employed to correct the wavefront phase distortions of OAM modes. The turbulence is emulated by the Monte-Carlo phase screen method, which is validated by comparison with the theoretical phase structure function. Based on that, a closed-loop AO system with the capability of real-time correction is designed and validated. The simulation results show that the phase distortions of OAM modes induced by turbulence can be significantly compensated by the real-time correction of the properly designed AO. Furthermore, the crosstalk across channels is reduced drastically, while a substantial enhancement of channel capacity can be obtained when AO is deployed.