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 approach to CFSO system in quadrature phase shift keying (QPSK) modulation format. A signal-preprocessing stage, which effectively avoided repetitive operations found traditional schemes, was Unlike existing algorithms, modulated ...

This paper explores the performance of a single input multiple output (SIMO) free space optical (FSO) communication system using differential chaos shift keying (DCSK) with diversity combining techniques. Specifically, presents use maximal ratio (MRC), equal gain (EGC), and selection (SC) techniques for DCSK-FSO system. Adding to FSO systems can significantly improve reliability performance, ma...

The free-space optical communication is regarded as a promising technique for next generation networks. However, all the data are exposed in free space with high risk of being attacked or eavesdropping by unauthorized parties. Here, bipolar photodetector based on graphene/GaN heterojunction demonstrated. polarity UV light photocurrent opposite to that red photocurrent, which results from interf...