Abstract
Optical beam wander is one of the most important issues for free-space optical (FSO) communication. We theoretically derive a beam wander model for Bessel beams propagating in turbulent atmosphere. The calculated beam wander of high order Bessel beams with different turbulence strengths are consistent with experimental measurements. Both theoretical and experimental results reveal that high order Bessel beams are less influenced by the turbulent atmosphere. We also demonstrate the Bessel beams based orbital angular momentum (OAM) multiplexing/demultiplexing in FSO communication with atmospheric turbulence. Under the same atmospheric turbulence condition, the bit error rates of transmitted signals carried by high order Bessel beams show smaller values and fluctuations, which indicates that the high order Bessel beams have an advantage of mitigating the beam wander in OAM multiplexing FSO communication.
Highlights
Of fluctuations of the Bessel beam are smaller than that of the Laguerre Gaussian beam with the same topological charge
The results show the Bessel-Gaussian beams are less affected by the turbulent atmosphere with larger values of topological charges[24,25,26]
We will accomplish the theoretical model of beam wander for Bessel beam in turbulent atmosphere, experimentally characterize the beam wander of high order Bessel beams at two temperatures different from room temperature and demonstrate the free space optical (FSO) communication using multiple coaxial Bessel beams propagating in turbulent atmosphere
Summary
Of fluctuations of the Bessel beam are smaller than that of the Laguerre Gaussian beam with the same topological charge. The results show the Bessel-Gaussian beams are less affected by the turbulent atmosphere with larger values of topological charges[24,25,26]. The Bessel beams have the extraordinary properties may improve the OAM multiplexing based optical communications performances in turbulent atmosphere. We derive an analytical formula for the beam wander of Bessel beams through turbulent atmosphere depending on the topological charge and turbulence strength. We experimentally measure the beam wander of the Bessel beams with various topological charges. The results show that the Bessel beams with larger topological charges have smaller beam wander. The measured BERs of the Bessel beams carrying the 10-Gbit/s on-off keying (OOK) signals can reach the forward error correction threshold
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