High-dimension data coding and decoding by radial mode and orbital angular momentum mode of a vortex beam in free space

•16 OAM modes (l=±1∼±8) and four radial modes (p=0∼3) are respectively employed for a 64-ary information coding/decoding.•A specially-designed DVG is used to demodulate the received OAM beams into an 4 × 4 intensity-array profile for decoding.•A proof-of-concept experimental are also proposed and es...

Full description

Saved in:
Bibliographic Details
Published in:Optics and lasers in engineering Vol. 137; p. 106352
Main Authors: Wang, Xiaohui, Song, Yingxiong, Pang, Fufei, Li, Yingchun, Zhang, Qianwu, Zhuang, Liyun, Guo, Xinnian, Ju, Yongfeng, Yang, Song, He, Xiaofeng, Yang, Yudong
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.02.2021
Subjects:
Digital image processing
Optical communication
Optical vortices
Radial mode
Optical communication
Radial mode
Optical vortices
Digital image processing
ISSN:0143-8166, 1873-0302
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•16 OAM modes (l=±1∼±8) and four radial modes (p=0∼3) are respectively employed for a 64-ary information coding/decoding.•A specially-designed DVG is used to demodulate the received OAM beams into an 4 × 4 intensity-array profile for decoding.•A proof-of-concept experimental are also proposed and established for verifying the feasibility and validity of the proposed concept in practice.•Bit error rates (BER) with respect to a series of parameters (AT strength, propagation distance, and bit rate) are also employed for evaluating the performance of the proposed concept, respectively. A novel coding/decoding concept based on the orbital angular momentum (OAM) mode and radial mode of a vortex beam is proposed for short-haul free-space optical communication. Sixty-four kinds of vortex beams, which are comprised of sixteen OAM modes and four radial modes, are employed and utilized for coding each of 6-bits-length sequences into one of the 64-ary symbols. A specially-designed Dammam vortex grating (DVG) is utilized to generate an intensity-array profile, where the received vortex beam is demodulated into Gaussian beam in the related coordinate (order). In one of the coordinates, the received vortex beam can be converted into a bright spot (Gaussian beam) with a certain number of intensity rings. According to the coordinate and number of intensity rings, the received vortex beam can be identified and then decoded into the initially-propagated information sequence. The corresponding theory analysis/simulations and experiments demonstrate that the proposed concept is valid and feasible. In addition, the measured results also demonstrate that the performance of the proposed concept declines as the transmission rate/ atmosphere turbulence strength/propagation distance increases. By adopting advanced devices and approaches, the performance of the proposed scenario can be significantly improved, and then the proposed concept can be potentially utilized for short-haul free-space optical communication in the future.
ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2020.106352