Fig. 8

Performance comparison of our PI coherent receiver and a direct detection (APD) receiver. BER vs optical received power for 10.7 Gb/s Alamouti-coded OFDM QPSK received using the PI coherent receiver (demonstrated in this article) and 10 Gb/s TDM-OOK received using a direct-detection (APD) receiver (demonstrated by Veen et al.)26