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Updated: Oct 22, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Physics-aware restoration and calibrated soft demodulation for turbulence-degraded OAM mode recognition
Pan Wang1, Yuqing Luo1, Wei Chen1
1School of Electronic Information Engineering, Anhui University, Hefei 230601, China.
Abstract:
Turbulence-degraded orbital angular momentum (OAM) mode recognition is critical for free-space optical (FSO) communication but is limited by atmospheric distortion. We propose a cascaded receiver integrating a vision transformer-based Uformer-OAM intensity-restoration network, an SE-ResNet-18 neural demodulator, and an entropy-modulated scaling (ETS) strategy for low-density parity-check (LDPC) soft decoding. In split-step beam propagation method (SS-BPM) simulations, Uformer-OAM achieves 31.34 dB peak signal-to-noise ratio (PSNR) and 96.9% recognition accuracy under strong turbulence (C n 2=10-13 m-2/3, z=1000 m), outperforming UNet by 7.19 dB and 18.3 points, and the full cascade attains bit error rate (BER) <10-6 at z=1300 m where baselines exhibit error floors.
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