1. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. (a) Orthogonally overlapped Nyquist pulses (b) band-limited spectrum of Nyquist pulse (c) band-limited spectrum of half cycle Nyquist subcarrier modulation (SCM) signal. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

2. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. The block diagram of baseband digital signal processing (DSP) at the transmitter. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

3. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. The block diagram of baseband DSP at the receiver. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

4. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. Training sequences (TSs) in the time domain at the transmitter. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

5. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. The received TSs in the frequency domain at the receiver. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

6. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. The block diagram of the overlap frequency domain equalization (OFDE) method. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

7. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. Bit error rate (BER) versus received optical power for dual-pol (43 km) with guard interval (GI) and without GI (using OFDE). Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

8. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. Experimental setup for half cycle 64-QAM Nyquist-SCM polarization division multiplexing IM/DD system. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

9. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. (a) The normalized amplitude response (b) the optical spectra of the optical carrier. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

10. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. (a) Transmitted spectrum with pre-equalization (b) received spectrum with pre-equalization and the spectrum of down-converted signal. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

11. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. BER versus received optical power. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101

12. Date of download: 7/10/2016 Copyright © 2016 SPIE. All rights reserved. 64-QAM constellations (a) at −3 dBm for OBTB, (b) at −9 dBm for OBTB, (c) at −3 dBm for 43 km, (d) at −13 dBm for 43 km. Figure Legend: From: Experimental demonstration of half cycle 64-QAM Nyquist-SCM direct-detection optical communication system with data-aided estimation and overlap frequency- domain equalization Opt. Eng. 2014;53(12):126101. doi:10.1117/1.OE.53.12.126101