A Low-Complexity Joint Compensation Scheme of Carrier Recovery for Coherent Free-Space Optical Communication

PLUTO / PLUTO-2 Spatial Light Modulators
Adaptive Optics / Wavefront Control Optical Communication
Published on:
Authors: Tang, Xinyu; Wang, Liqian; Zhang, Wei; Cai, Shanyong; Li, Yuemei & Zhang, Zhiguo
Abstract:
“In this paper, a low-complexity joint compensation scheme of carrier recovery (JCSCR) for coherent free-space optical (CFSO) communication is proposed. We applied the carrier recovery joint compensation approach to a CFSO communication system in the quadrature phase shift keying (QPSK) modulation format. A signal-preprocessing stage, which effectively avoided the repetitive operations found in traditional carrier recovery schemes, was proposed. Unlike in existing carrier recovery algorithms, the modulated phase of the received signal could be accurately removed using only the sum and subtraction of real absolute values in the signal-preprocessing stage, greatly reducing the complexity of the operation. Since this algorithm avoids the traditional fourth operation, the system’s complexity is reduced while additional noise generated by fourth cross-terms would be prevented and system noise immunity would be greatly enhanced. In addition, this algorithm uses joint compensation of phase errors in the final compensation stage, further reducing the complexity of the computation of the whole algorithmic scheme. A 10 Gbps QPSK CFSO communication transmission experiment was conducted in an atmospheric turbulence channel to verify the proposed technique and improvement in receiver sensitivity.”

Open Access

Publication: Photonics
Issue/Year: Photonics, Volume 10; Number 4; Pages 389; 2023
DOI: 10.3390/photonics10040389
Link: https://doi.org/10.3390/photonics10040389

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