Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Method of Crosstalk Analysis for CO-ORMDM Systems

  • Kyung Hee Seo (Sogang Institute for Convergence Education, Sogang University) ;
  • Jae Seung Lee (Department of Electronic Engineering, Kwangwoon University)
  • Received : 2023.10.17
  • Accepted : 2024.03.14
  • Published : 2024.04.25
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Abstract

Recently, a new kind of optical multiplexing called optical-receiver-mode (ORM)-division multiplexing (ORMDM) has been proposed, in which an optical channel is a linear sum of ORM subchannels modulated independently. Using coherent-optical (CO) techniques, it has been reported that COORMDM communication systems can have very high spectral efficiencies (SEs). To estimate the SEs of CO-ORMDM communication systems, we introduce a new method of crosstalk analysis. Using this method, we can allocate quadrature-amplitude-modulation (QAM) codes and QAM step sizes unevenly over ORM subchannels to obtain higher SEs. With 50 Gaussian ORMs, we obtain a SE of up to 15.29 bit s-1 Hz-1.

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Acknowledgement

This work was supported by the Research Grant of Kwangwoon University in 2023.

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