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Analysis on the propagation characteristics of two multiplexed groups of coaxial OAM beams in atmospheric turbulence
Author(s): Yongping Zheng; Qinghua Tian; Wei Zhang; Qi Zhang; Lei Zhu; Yongjun Wang; Bo Liu; Xiangjun Xin
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Paper Abstract

Orbital angular momentum (OAM) as a new degree of freedom, greatly improves the spectrum efficiency and channel capacity of optical communication system. It has become the research focus in the field of optical communications. Some scholars have demonstrated that the feasibility of two multiplexed groups of concentric rings of Laguerre-Gaussian (LG) beams with OAM multiplexing transmission in free space. Based on the point, this paper makes the further research on the propagation characteristics of LG beams with this spatial multiplexing structure in atmospheric turbulence. The random phase screen is established by using the modified von Karman power spectrum and the received power and crosstalk power of OAM modes of LG beams are obtained under the Rytov approximation. We investigate the characteristic parameters of LG beams with this spatial multiplexing structure for mitigating turbulence. Simulation results show that the system exists an optimum beam waist related to wavelength in which the received power of OAM modes reaches the maximum. Meanwhile, the BER and aggregate capacity of the system with two multiplexed groups of concentric rings of LG beams with OAM multiplexing are simulated and analyzed under different intensities of atmospheric turbulence. The results reveal that the system with larger mode spacing generally has lower inter-modal crosstalk and larger aggregate capacity than that with the smaller mode spacing. Finally, on the basis of above the analysis and research, some suggestions for efficient OAM multiplexing detection scheme are proposed.

Paper Details

Date Published: 10 January 2018
PDF: 11 pages
Proc. SPIE 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 106170R (10 January 2018); doi: 10.1117/12.2295348
Show Author Affiliations
Yongping Zheng, Beijing Univ. of Posts and Telecommunications (China)
Qinghua Tian, Beijing Univ. of Posts and Telecommunications (China)
Wei Zhang, National Univ. of Defense Technology (China)
Qi Zhang, Beijing Univ. of Posts and Telecommunications (China)
Lei Zhu, Beijing Univ. of Posts and Telecommunications (China)
Yongjun Wang, Beijing Univ. of Posts and Telecommunications (China)
Bo Liu, Nanjing Univ. of Information Science and Technology (China)
Xiangjun Xin, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 10617:
2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing
Liquan Dong; Yi Dong; Jian Chen; Fabien Bretenaker, Editor(s)

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