FIG 3 (IMAGE) Compuscript Ltd Caption Fig. 3 | (a) Experimental setup and DSP flow charts. (b) Optical spectra of the 64-QAM signals measured at different stages. (c) BER versus CSPR in the transmission and OBTB cases. (d) BER versus ROP in the transmission and OBTB cases. Credit OES Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.