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Analysis of Hermite-Gaussian and Laguerre–Gaussian modes in mode division multiplexing based FSO system

ANUSHTHA NIMAVAT1, AMAN SAH1, TUSHAR POKHRA1, ABHISHEK TRIPATHI2,* , SHILPI GUPTA1,*

Affiliation

  1. Department of Electronics Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India
  2. Department of Computer Science and Engineering, Kalasalingam Academy of Research and Education, Srivilliputhur, Tamil Nadu, India

Abstract

Free space optics (FSO) is a non-line of sight (NLoS) technique for providing ubiquitous digital services, especially in sectors where the frequency allocation is pretty tight and not practically possible to accommodate all the users. In this work, we have designed a model that transmits four independent modes (HG00, HG01, LG00, and LG10) carrying pseudo-random bit sequence multiplexed into a single free space channel and studied under the subject of various attenuation and link length values. We found the HG family outperforming the LG family by having ~7.7% lower bit error rate (BER), and 4% higher Q-factor for 18 dB/km attenuation at 600 m link range.

Keywords

Optical Wireless, Hermite-Gaussian, Laguerre–Gaussian, Mode Division Multiplexing.

Citation

ANUSHTHA NIMAVAT, AMAN SAH, TUSHAR POKHRA, ABHISHEK TRIPATHI, SHILPI GUPTA, Analysis of Hermite-Gaussian and Laguerre–Gaussian modes in mode division multiplexing based FSO system, Optoelectronics and Advanced Materials - Rapid Communications, 17, 3-4, March-April 2023, pp.122-128 (2023).

Submitted at: Nov. 2, 2022

Accepted at: April 7, 2023