ATMOSPHERIC OPTICAL COMMUNICATION-SYSTEM USING SUBCARRIER PSK MODULATION

Atmospheric optical communication (AOC) system using subcarrier PSK mo dulation is proposed and its superiority to OOK modulation in the pres ence of scintillation is discussed theoretically. An experimental AOC setup with a subcarrier modulated by 155.52 (Mb/s) DPSK at light wavel ength lambda=0.83(mum) over an 1.8(km) outdoor path is employed to sho w the performance. Theoretical and experimental results are compared u nder scintillation in clear weather and a good agreement is observed. Finally, AOC systems using subcarrier M-ary PSK and multiple subcarrie rs are proposed and discussed.