Abstract
We present a scheme to realize obstruction- and turbulence-tolerant free-space orbital angular momentum (OAM) multiplexing link by using self-healing Bessel beams accompanied by adaptive compensation techniques. Compensation of multiple 16-ary quadrature amplitude modulation (16-QAM) data carrying Bessel beams through emulated atmospheric turbulence and obstructions is demonstrated. The obtained experimental results indicate that the compensation scheme can effectively reduce the inter-channel crosstalk, improve the bit-error rate (BER) performance, and recuperate the nondiffracting property of Bessel beams. The proposed scheme might be used in future high-capacity OAM links which are affected by atmospheric turbulence and obstructions.
Highlights
In this paper, we propose an obstruction- and turbulence-tolerant free-space optical communication (FSO) orbital angular momentum (OAM) multiplexing link by using self-healing Bessel beams assisted by adaptive compensation techniques
We have experimentally demonstrated an OAM-carrying Bessel beam multiplexing link for adaptive FSO communications through turbulence
To realize obstructionand turbulence-tolerant OAM FSO links, adaptive compensation approach has been introduced to the Bessel multiplexing system
Summary
We propose an obstruction- and turbulence-tolerant FSO OAM multiplexing link by using self-healing Bessel beams assisted by adaptive compensation techniques. A spatial light modulator (SLM) loaded with Kolmogorov phase mask added by an obstruction phase mask is used to simultaneously emulate atmospheric turbulence and obstruction in the laboratory environment. By measuring the phase distortions of a probe Gaussian beam through a wavefront sensor (WFS), correction masks are created and loaded to another SLM to compensate the distortions of multiplexed Bessel beams. Using this scheme, we experimentally demonstrate compensation of multiple Bessel beams through emulated atmospheric turbulence and obstruction. The compensation effects on inter-channel crosstalk and bit-error rate (BER) performance of a two Bessel beams multiplexing system each carrying a 10-Gbaud (40-Gbit/s) 16-ary quadrature amplitude modulation (16-QAM) data are studied
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