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LDPC-coded orbital angular momentum (OAM) modulation for free-space optical communication.

Ivan B Djordjevic1, Murat Arabaci

  • 1Department of Electrical and Computer Engineering, University of Arizona, 1230 E. Speedway Blvd., Tucson, AZ 85721, USA. ivan@ece.arizona.edu

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A new orbital angular momentum (OAM) modulation scheme enhances Free-Space Optics (FSO) communication. This LDPC-coded system achieves 100 Gb/s transmission even in strong turbulence, outperforming existing methods.

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Area of Science:

  • Optical Communications
  • Wireless Communication Technologies
  • Information Theory

Background:

  • Free-space optical (FSO) communication systems face challenges from atmospheric turbulence.
  • High data rates are crucial for next-generation optical networks.
  • Orbital Angular Momentum (OAM) offers a promising approach to increase spectral efficiency.

Purpose of the Study:

  • To propose and evaluate a novel LDPC-coded modulation scheme utilizing OAM for FSO communication.
  • To demonstrate the scheme's effectiveness under strong atmospheric turbulence.
  • To compare the performance of binary and nonbinary LDPC-coded OAM modulations.

Main Methods:

  • Development of an OAM-based modulation scheme integrated with Low-Density Parity-Check (LDPC) coding.
  • Experimental or simulation-based analysis of the scheme's performance in simulated strong atmospheric turbulence.
  • Comparative study of binary and nonbinary LDPC coding for OAM modulation.
  • Evaluation of combining schemes, specifically Maximum-Ratio Combining (MRC) versus Equal-Gain Combining (EGC).

Main Results:

  • The proposed OAM-based LDPC-coded modulation scheme successfully operates under strong atmospheric turbulence.
  • Achieved 100 Gb/s optical transmission using 10 Gb/s components.
  • Nonbinary LDPC-coded OAM modulation demonstrated superior Bit Error Rate (BER) performance and reduced decoder complexity/latency compared to binary LDPC.
  • A net coding gain of 9.3 dB at a BER of 10^-8 was achieved with nonbinary LDPC-coded OAM.
  • MRC outperformed EGC by approximately 2.5 dB.

Conclusions:

  • The proposed LDPC-coded OAM modulation scheme is a viable solution for high-speed FSO communication, even in adverse atmospheric conditions.
  • Nonbinary LDPC coding offers significant advantages in terms of performance, complexity, and latency for OAM-based FSO systems.
  • The findings pave the way for more robust and efficient FSO communication systems.