[TuB3] Coding and Equalization

[TuB3-3] Experimental Comparison of Pulse Position and Hamming-Coded Modulations for High Sensitivity Coherent FSO Communications

Keisuke Matsuda, 〇Shota Koshikawa, Masashi Binkai, Tsuyoshi Yoshida, Naoki Suzuki (Mitsubishi Electric Corporation, Japan)

Keywords:Free space optical communications, Coherent communications

We experimentally compared 4PPM-QPSK and Hamming-coded QPSK for coherent FSO applications with low symbol rates. Carrier recovery in 4PPM-QPSK works better because of the higher per-symbol power at pulses, leading to 1.1 dB better sensitivity.