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Research on spatial multiplexing using BGSM beam in FSO communication
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NSTL
Elsevier
We propose a spatial division multiplexing scheme based on the Bessel-Gaussian Schell-mode beam. Such a communication scheme can enhance the capacity of free-space optical communication (FSO) in turbulence. This multiplexing utilizes the relationship between the characteristics of coherence degree distribution and the distant facula, realizing the separation of several BGSM beams with different Bessel parameter from each other, which makes the multiplexing technique deploying coherence modulation possible. The advantage of this scheme is its resistance to the atmospheric influence which exists widely in the optical wireless communication's application environment. According to the simulation, for the transmission length of about 1300 m, under the weak turbulence environment (C-n(2) = 10(-16) m(2/3)), the BGSM-SDM scheme can support about 5 times more capacity compared with the traditional optical wireless communication scheme with Gaussian beam, and while the turbulence becomes strong (C-n(2) = 10(-13) m(2/3)), the SDM scheme degenerates to single channel because of the beam expansion, but it can still support more than 2 times more capacity. The scheme is proved work stable for each channel, and applicable in strong turbulent environment by measuring the signal and noise in the experiment. I believe it provides a promising choice for the future 6G ultrahigh-speed wireless communication.
NSTL
Elsevier
