Coding and decoding data by multiplexing vortex beams in free space

A novel concept of coding/decoding data is proposed by multiplexing vortex beams for short-haul-free-space light communication. Eight vortex beams carrying different orbital angular momentum (OAM) modes (-5, 3, -2, 1, 5, -3, 2, -1) are employed to code the initial information sequences into each 256...

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Vydané v:Optics communications Ročník 472; s. 125909
Hlavní autori: Wang, Xiaohui, Song, Yingxiong, Pang, Fufei, Li, Yingchun, Zhang, Qianwu, Zhuang, Liyun, Guo, Xinnian, Ju, Yongfeng, He, Xiaofeng, Yang, Song, Yang, Yudong
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier B.V 01.10.2020
Predmet:
Coding and decoding
Optical communication
Optical vortices
Optical communication
Optical vortices
Coding and decoding
ISSN:0030-4018, 1873-0310
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Shrnutí:A novel concept of coding/decoding data is proposed by multiplexing vortex beams for short-haul-free-space light communication. Eight vortex beams carrying different orbital angular momentum (OAM) modes (-5, 3, -2, 1, 5, -3, 2, -1) are employed to code the initial information sequences into each 256-ary symbols by different multiplexing approaches. A specially-designed Dammam vortex grating is utilized to decode the received vortex beams into the initial information sequences. In order to certifying the validity and feasibility of the proposed concept in practice, a proof-of-concept experiment is also proposed and established. The measured results demonstrate that a 128 × 128 gray-scale image (“Lena”) can be perfectly propagated over a 10 m free space by the proposed concept. In order to further evaluate the performance of the proposed concept, bit error rate (BER) against the received optical signal-to-noise ratio (OSNR) is also employed to analyzing the influences of some parameters on the system performances. The measured BER distributions demonstrate that the BER performance decreases as the data rate/propagation distance/atmosphere turbulence strength increases, respectively. •We proposed a novel scenario of coding and decoding data by multiplexing vortex beams in free space is proposed.•Eight OAM modes are employed to code/decode data by (de)multiplexing for representing 256-ary symbols.•A single hologram is designed to generate the multiplexed vortex beams for coding.•A Dammam vortex grating is also designed for demodulating the received vortex beams.•An experiment is established for verifying the validity and feasibility of the proposed concept and analyzing the performance of the proposed system.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2020.125909