1. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The measured BER curves for 6-bit hierarchical-modulated SC-FDM signal with different r1. Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115

2. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The measured peak-to-average power ratio (PAPR) and bit error ratio (BER) of level 1 for 4-bit hierarchical-modulated optical SC- FDM signal with different r1 (received optical power=−14 dBm, b2b). Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115

3. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The complementary cumulative distribution function (CCDF) of optical SC-FDM signal with 4-bit hierarchical modulation. Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115

4. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The examples of hierarchical modulation with (a) 4 bits of two levels; (b) 6 bits of three levels. Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115

5. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The schematic diagram of hierarchical-modulated single-carrier frequency division multiplexing (SC-FDM) signal: (a) transmitter; (b) receiver. Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115

6. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The measured BER curves for 4-bit hierarchical-modulated SC-FDM signal with different r1. Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115

7. Date of download: 6/1/2016 Copyright © 2016 SPIE. All rights reserved. The experimental setup for the SC-FDMA system with hierarchical modulation (AWG: arbitrary waveform generator; MZM: Mach– Zehnder modulator; EDFA: Er-doped fiber amplifier; VOA: variable optical attenuator; PD: photodiode; TDS: real-time digital oscillator). Figure Legend: From: Peak-to-average power ratio mitigation and adaptive bit assignment in single-carrier frequency division multiplexing access via hierarchical modulation Opt. Eng. 2014;53(11):116115. doi:10.1117/1.OE.53.11.116115