Consideration of All-Optical Modulation Format Conversion From BPSK to QPSK in Free-Space Communication Using OAM Beam

摘要

This paper considers an issue of phase error in the all-optical modulation format conversion from BPSK to QPSK in free-space communication using OAM beam. Numerical simulation reveals that the phase error affects the constellation of the converted signal and the performance evaluated by error vector magnitude.