Abstract
In this paper, we propose two succinct probabilistic shaping (PS) schemes with 18.8% and 37.5% overhead for quasi-cyclic low-density parity-check code to transmit polarization-multiplexed 16 quadrature amplitude modulation (PM-16QAM) signal over the turbulent free space optical (FSO) links. We theoretically analyze irradiance fluctuation within the cross section of received beam after propagating through the Gamma–Gamma channel, of which the refractive-index property is related to Kolmogorov spectrum. The Gamma–Gamma channel model is used to simulate the effects of atmosphere turbulence on PS PM-16QAM FSO communication system. Simulation results show that the proposed PS schemes provide a more efficient way to compensate scintillation effects compared with uniform distribution in PM-16QAM FSO communication system under different turbulence strength regimes. Furthermore, indoor short-range experiments have been carried out to verify the effectiveness of the proposed probabilistic shaping schemes
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