1. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. Architecture of the proposed wavelength division multiplex-radio over fiber-passive optical network (WDM-ROF-PON). LD, laser diode; LO, local oscillator; MZM, Mach–Zehnder modulator; Mux, multiplexer; Demux, demultiplexer; C, circulator; SMF, single- mode fiber; FBG, fiber Bragg grating; PIN, pin photodiode; EA, electrical amplifier; LPF, low-pass filter; EDFA, erbium-doped fiber amplifier; and BERT, bit error rate (BER) tester. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108

2. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. Simulation setup of WDM-ROF-PON. VOA, variable optical attenuator and 3R Re, 3R regenerator. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108

3. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. Optical spectra at some different locations. (a) Optical sidebands after the first MZM, (b) optical sidebands recombined by the multiplexer, (c) negative 5th-order sideband and positive 1st-order sideband recombined by the multiplexer in AP1, (d) positive 1st- order sideband reflected by FBG in AP1, (e) uplink signals from three APs, (f) received uplink signals from three APs at OLT. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108

4. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. RF signal in frequency domain. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108

5. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. BER curves of both downlink and uplink of three APs. (a) BER performances for three APs after 30 km SMF transmission, (b) BER performances of both downlink and uplink for AP1, (c) BER performances of both downlink and uplink for AP2, (d) BER performances of both downlink and uplink for AP3. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108

6. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. Power penalties from crosstalk, ASE, and dispersion. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108

7. Date of download: 6/6/2016 Copyright © 2016 SPIE. All rights reserved. Relationship between Q factor and reflectivity. Figure Legend: From: Novel wavelength division multiplex-radio over fiber-passive optical network architecture for multiple access points based on multitone generation and triple sextupling frequency Opt. Eng. 2014;53(1):016108. doi:10.1117/1.OE.53.1.016108