We proposed a ditherless automatic bias control algorithm based on partial derivative estimation and neural network. Simulation results show the precision for bias IQ and P can achieve 0.5% and 0.1% of 21Vπ respectively.
This paper experimentally demonstrates a real-time bidirectional communication system of 16-ary pulse position modulation over a free space optical transmission. This system can guarantee error-free transmission when the received optical power is higher than -38dBm.
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