Abstract
The spatial diversity detection is experimentally demonstrated for free-space optical (FSO) communications using a single-photodetector (single-PD) coherent receiver array with quadrature phase shift keying (QPSK) signals in an atmospheric cell. The single-PD based on the Kramers–Kronig relation, which can recover the signal from the detected intensity has the advantages of simple structure and cost-effectiveness, and its performance is close to that of the conventional coherent receiver. The spatial diversity technology is verified using a two-aperture single-PD coherent receiver array and the impact of the atmospheric turbulence is effectively reduced. When the bit error rate (BER) is 1 × 10−3, using the dual single-PD receiver array, the received power of −45.96, −44.88, or −43.87 dBm is achieved when the temperature difference of the atmospheric cell is 0, 100, or 250 °C, respectively, which is 2.10, 2.16, or 2.25 dB receiver sensitivity improved compared to a single-PD receiver.
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