Performance of optical OAM demultiplexing system based on a scattering medium diffuser

Long Wang; Zhaoyuan Zhang; Xiaoli Yin

doi:10.1117/12.3004025

24 November 2023 Performance of optical OAM demultiplexing system based on a scattering medium diffuser

Long Wang, Zhaoyuan Zhang, Xiaoli Yin

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129350N (2023) https://doi.org/10.1117/12.3004025
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

The multiplexing of vortex beams carrying orthogonal orbital angular momentum (OAM) modes holds the potential to enhance the channel capacity (CC) of wireless optical communication systems. This paper proposes a method that utilizes optical phase conjugation (OPC) wavefront shaping by spatial light modulator (SLM), and regards the scattering medium diffuser (SMD) as an optical modulator to achieve the demultiplexing of multiplexed OAM beams through space channel. We also analyze the communication capability of the demultiplexing system in the atmospheric turbulence (AT) channel. In the proposed system, a simulation setup is employed where multiplexed OAM beams propagate through an AT channel simulated by a random phase screen. At the receiving end, the OPC method is used to obtain a phase mask that is loaded onto the SLM for wavefront shaping of the input multiplexed OAM light. The light field is then modulated through the SMD's multi-scattering effect, enabling the separation of multiplexed OAM beams to distinct detection positions for demultiplexing. This paper investigates the influence of the OAM mode and AT strength on the focusing of single-mode OAM beams. Additionally, it examines the impact of OAM multiplexing combinations, AT strength, and transmission distance on the detection probability, bit error rate (BER), and CC. The results demonstrate the effectiveness of the demultiplexing system in mitigating mode expansion caused by AT, offering valuable insights for the design of robust OAM multiplexing systems.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Long Wang, Zhaoyuan Zhang, and Xiaoli Yin "Performance of optical OAM demultiplexing system based on a scattering medium diffuser", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129350N (24 November 2023); https://doi.org/10.1117/12.3004025

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KEYWORDS

Multiplexing

Spatial light modulators

Telecommunications

Laser scattering

Crosstalk

Modulation

Optical simulations

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