Divergence-degenerate spatial multiplexing towards future ultrahigh capacity, low error-rate optical communications

Zhensong Wan; Yijie Shen; Zhaoyang Wang; Zijian Shi; Qiang Liu; Xing Fu

doi:10.1038/s41377-022-00834-4

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Divergence-degenerate spatial multiplexing towards future ultrahigh capacity, low error-rate optical communications

Articles

- Divergence-degenerate spatial multiplexing towards future ultrahigh capacity, low error-rate optical communications
- Light: Science & Applications Vol. 11, Issue 6, Pages: 1253-1263(2022)
- Affiliations：
  
  1.Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, 100084, Beijing, China
  2.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China
  3.Optoelectronics Research center, University of Southampton, Southampton, SO17 1BJ, UK
- Author bio：
  
  Qiang Liu (qiangliu@mail.tsinghua.edu.cn)
  Xing Fu (fuxing@mail.tsinghua.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00834-4
  CLC：
- Published：30 June 2022，
  
  Published Online：19 May 2022，
  
  Received：16 March 2022，
  
  Revised：28 April 2022，
  
  Accepted：29 April 2022
- Accepted：
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Wan, Z. S. et al. Divergence-degenerate spatial multiplexing towards future ultrahigh capacity, low error-rate optical communications. Light: Science & Applications, 11, 1253-1263 (2022).
DOI：

Wan, Z. S. et al. Divergence-degenerate spatial multiplexing towards future ultrahigh capacity, low error-rate optical communications. Light: Science & Applications, 11, 1253-1263 (2022). DOI： 10.1038/s41377-022-00834-4.

摘要

Abstract

Spatial mode (de)multiplexing of orbital angular momentum (OAM) beams is a promising solution to address future bandwidth issues

but the rapidly increasing divergence with the mode order severely limits the practically addressable number of OAM modes. Here we present a set of multi-vortex geometric beams (MVGBs) as high-dimensional information carriers for free-space optical communication

by virtue of three independent degrees of freedom (DoFs) including central OAM

sub-beam OAM

and coherent-state phase. The novel modal basis set has high divergence degeneracy

and highly consistent propagation behaviors among all spatial modes

capable of increasing the addressable spatial channels by two orders of magnitude than OAM basis as predicted. We experimentally realize the tri-DoF MVGB mode (de)multiplexing and data transmission by the conjugated modulation method

demonstrating lower error rates caused by center offset and coherent background noise

compared with OAM basis. Our work provides a potentially useful basis for the next generation of large-scale dense data communication.

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