Y. Luo, X. Zhou, F. Effenberger, X. Yan, G. Peng, Y. Qian, Y. Ma, "Time- and wavelength-division multiplexed passive optical network (TWDM-PON) for
next-generation PON stage 2 (NG-PON2)," J. Lightw. Technol. 31
, 587-593 (2013).

Q. W. Zhang, E. Hugues-Salas, R. P. Giddings, M. Wang, J. M. Tang, "Experimental demonstrations of record high REAM intensity modulator-enabled 19.25 Gb/s real-time
end-to-end dual-band optical OFDM colorless transmissions over 25 km SSMF IMDD systems," Opt. Exp. 21, 9167-9179 (2013).

E. Hugues-Salas, Q. Zhang, R.P. Giddings, M. Wang, J.M. Tang, "
Adaptability-enabled record-high and robust capacity-versus-reach performance of real-time dual-band optical OFDM
signals over various OM1/OM2 MMF systems [Invited]," J. Opt. Comm. Netw. 5, A1-AA11 (2013).

N. Cvijetic, M. Cvijetic, M. F. Huang, E. Ip, Y. K. Huang, T. Wang, "Terabit optical access networks based on WDM-OFDMA-PON
," J. Lightw. Technol. 30, (2012).

E. Hugues-Salas, R. P. Giddings, X. Q. Jin, Y. Hong, T. Quinlan, S. Walker, J.M. Tang, "REAM intensity modulator-enabled 10 Gb/s colorless upstream transmission of
real-time optical OFDM signals in a single-fiber-based bidirectional PON architecture,"
Opt. Exp. 20, 21089-21100
(2012).

G. Engel, D. E. Fague, A. Toledano, "RF digital-to-analog converters
enable direct synthesis of communications signals," IEEE Commun. Mag. 50, 108-116 (2012).

N. Cvijetic, "OFDM for next-generation optical access networks," J. Lightw. Technol. 30, 384
-398 (2012).

J. L. Wei, J. D. Ingham, D. G. Cunningham, R. V. Penty, I. H. White, "Performance and power dissipation comparisons between 28 Gb/s NRZ, PAM, CAP and optical OFDM systems
for data communication applications," J. Lightw. Technol. 30
, 3273-3280 (2012).

E. Wong, "Next-generation broadband access networks and technologies
," J. Lightw. Technol 30, 597-608 (2012).

E. Giacoumidis, A. Kavatzikidis, A. Tsokanos, J. M. Tang, I. Tomkos, "Adaptive loading algorithms for IMDD optical OFDM PON systems using directly modulated lasers
," J. Opt. Commun. Netw. 4, 769-778 (2012).

X. Q. Jin, J. L. Wei, R. P. Giddings, T. Quinlan, S. Walker, J. M. Tang, "Experimental demonstrations and extensive
comparisons of end-to-end real-time optical OFDM transceivers with adaptive bit and/or power loading," IEEE Photon. J. 3, 500-511 (2011).

R. Bouziane, P. Milder, R. Koutsoyannis, Y. Benlachtar, J. C. Hoe, M. Püschel, M. Glick, R. I. Killey, "Design studies for ASIC implementations of 28 GS/s optical QPSK- and 16-QAM-OFDM transceivers
," Opt. Exp. 19,
20857-20864 (2011).

R.P. Giddings, E. Hugues-Salas, B. Charbonnier, J. M. Tang, "Experimental demonstration of real-time optical OFDM transmission at
11.25 Gb/s over 500 m MMFs employing directly modulated DFB lasers," IEEE Photon.
Technol. Lett. 23, 51-53
(2011).

X.Q. Jin, E. Hugues-Salas, R.P. Giddings, J.L. Wei, J. Groenewald, J.M. Tang, "First real-time experimental
demonstrations of 11.25 Gb/s optical OFDMA PONs with adaptive dynamic bandwidth allocation," Opt. Exp. 19, 20557-20570 (2011).

R. P. Giddings, J. M. Tang, "Experimental demonstration and optimisation of a synchronous clock recovery technique for real-time
end-to-end optical OFDM transmission at 11.25 Gb/s over 25 km SSMF," Opt. Exp.
19, 2831-2845 (2011).

X. Q. Jin, R. P. Giddings, E. Hugues-Salas, J. M. Tang, "Real-time experimental demonstration of optical OFDM symbol
synchronization in directly modulated DFB laser-based 25 km SMF IMDD systems," Opt.
Exp. 18, 21100-21110
(2010).

S. Chen, Y. Ma, W. Shieh, "Multiband real-time coherent optical
OFDM reception up to 110 Gb/s with 600-km transmission," IEEE Photon. J. 2, 454-459 (2010).

N. Kaneda, Q. Yang, X. Liu, S. Chandrasekhar, W. Shieh, Y. Chen, "Real-time 2.5 GS/s coherent optical
receiver for 53.3-Gb/s sub-banded OFDM," J. Lightw. Tech. 28
, 494-501 (2010).

R. P. Giddings, X. Q. Jin, E. Hugues-Salas, E. Giacoumidis, J. L. Wei, J. M. Tang, "Experimental demonstration of
a record high 11.25 Gb/s real-time optical OFDM transceiver supporting 25 km SMF end-to-end transmission in
simple IMDD systems," Opt. Exp. 18, 5541-5555 (2010).

Y. Benlachtar, P. M. Watts, R. Bouziane, P. Milder, D. Rangaraj, A. Cartolano, R. Koutsoyannis, J. C. Hoe, M. Püschel, M. Glick, R. I. Killey, "Generation of optical OFDM signals using 21.4 GS/s real time digital signal processing
," Opt. Exp. 17,
17658-17668 (2009).

Q. Yang, S. Chen, Y. Ma, W. Shieh, "Real time reception of multi-gigabit coherent optical OFDM signals," Opt. Exp. 17, 7985-7992 (2009).

J. Armstrong, "OFDM for optical communications," J.
Lightw. Technol. 27, 189-
204 (2009).

R. P. Giddings, X. Q. Jin, H. H. Kee, X. L. Yang, J. M. Tang, "Real-time implementation of optical OFDM transmitters and receivers for practical end-to-end optical
transmission systems," Electron. Lett. 45, 800-802 (2009).

R. P. Giddings, X. Q. Jin, J. M. Tang, "Experimental demonstration of
real-time 3 Gb/s optical OFDM transceivers," Opt. Exp. 17
, 16654-16665 (2009).

R. P. Giddings, X.Q. Jin, J.M. Tang, "First experimental
demonstration of 6 Gb/s real-time optical OFDM transceivers incorporating channel estimation and variable power
loading," Opt. Exp. 17, 19727-19738 (2009).

X.Q. Jin, R.P. Giddings, J.M. Tang, "Real-time transmission of 3 Gb/s
16-QAM encoded optical OFDM signals over 75 km SMFs with negative power penalties,"
Opt. Exp. 17, 14574-14585
(2009).

J. M. Tang, P. M. Lane, K. A. Shore, "Transmission performance of adaptively
modulated optical OFDM signals in multimode fiber links," IEEE Photon. Technol. Lett.
18, 205-207 (2006).

J. M. Tang, K. Alan Shore, "30-Gb/s signal transmission over 40-km directly modulated DFB-laser-based single-mode-fiber links
without optical amplification and dispersion compensation," J. Lightw. Tech.
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D. K. Kim, S. H. Do, H. B. Cho, H. J. Choi, K. B. Kim, "A new joint
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real-time optical OFDM signals in a single-fiber-based bidirectional PON architecture,"
Opt. Exp. 20, 21089-21100
(2012).

X.Q. Jin, R.P. Giddings, J.M. Tang, "Real-time transmission of 3 Gb/s
16-QAM encoded optical OFDM signals over 75 km SMFs with negative power penalties,"
Opt. Exp. 17, 14574-14585
(2009).

D. K. Kim, S. H. Do, H. B. Cho, H. J. Choi, K. B. Kim, "A new joint
algorithm of symbol timing recovery and sampling clock adjustment for OFDM systems,"
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enable direct synthesis of communications signals," IEEE Commun. Mag. 50, 108-116 (2012).

R.P. Giddings, E. Hugues-Salas, B. Charbonnier, J. M. Tang, "Experimental demonstration of real-time optical OFDM transmission at
11.25 Gb/s over 500 m MMFs employing directly modulated DFB lasers," IEEE Photon.
Technol. Lett. 23, 51-53
(2011).

X. Q. Jin, J. M. Tang, "Optical OFDM synchronization with symbol timing offset and sampling clock offset compensation in
real-time IMDD systems," IEEE Photon. J. 3, 187-196 (2011
).

X. Q. Jin, J. L. Wei, R. P. Giddings, T. Quinlan, S. Walker, J. M. Tang, "Experimental demonstrations and extensive
comparisons of end-to-end real-time optical OFDM transceivers with adaptive bit and/or power loading," IEEE Photon. J. 3, 500-511 (2011).

S. Chen, Y. Ma, W. Shieh, "Multiband real-time coherent optical
OFDM reception up to 110 Gb/s with 600-km transmission," IEEE Photon. J. 2, 454-459 (2010).

J. M. Tang, P. M. Lane, K. A. Shore, "Transmission performance of adaptively
modulated optical OFDM signals in multimode fiber links," IEEE Photon. Technol. Lett.
18, 205-207 (2006).

M. Zimmerman, A. Kirsch, "
The AN/GSC-10/KATHRYN variable rate data modem for HF radio," IEEE Trans. Commun.
Technol. COM-15, 197-205
(1967).

R.W Chang, R. A. Gibby, "A theoretical study of performance of an orthogonal multiplexing data transmission scheme
," IEEE Trans. Commun. Technol. 16, 529-540 (1968).

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204 (2009).

J. M. Tang, K. Alan Shore, "30-Gb/s signal transmission over 40-km directly modulated DFB-laser-based single-mode-fiber links
without optical amplification and dispersion compensation," J. Lightw. Tech.
24, 2318-2327 (2006).

N. Kaneda, Q. Yang, X. Liu, S. Chandrasekhar, W. Shieh, Y. Chen, "Real-time 2.5 GS/s coherent optical
receiver for 53.3-Gb/s sub-banded OFDM," J. Lightw. Tech. 28
, 494-501 (2010).

E. Wong, "Next-generation broadband access networks and technologies
," J. Lightw. Technol 30, 597-608 (2012).

N. Cvijetic, "OFDM for next-generation optical access networks," J. Lightw. Technol. 30, 384
-398 (2012).

J. L. Wei, J. D. Ingham, D. G. Cunningham, R. V. Penty, I. H. White, "Performance and power dissipation comparisons between 28 Gb/s NRZ, PAM, CAP and optical OFDM systems
for data communication applications," J. Lightw. Technol. 30
, 3273-3280 (2012).

Y. Luo, X. Zhou, F. Effenberger, X. Yan, G. Peng, Y. Qian, Y. Ma, "Time- and wavelength-division multiplexed passive optical network (TWDM-PON) for
next-generation PON stage 2 (NG-PON2)," J. Lightw. Technol. 31
, 587-593 (2013).

N. Cvijetic, M. Cvijetic, M. F. Huang, E. Ip, Y. K. Huang, T. Wang, "Terabit optical access networks based on WDM-OFDMA-PON
," J. Lightw. Technol. 30, (2012).

E. Hugues-Salas, Q. Zhang, R.P. Giddings, M. Wang, J.M. Tang, "
Adaptability-enabled record-high and robust capacity-versus-reach performance of real-time dual-band optical OFDM
signals over various OM1/OM2 MMF systems [Invited]," J. Opt. Comm. Netw. 5, A1-AA11 (2013).

X. Q. Jin, R. P. Giddings, E. Hugues-Salas, J. M. Tang, "Real-time experimental demonstration of optical OFDM symbol
synchronization in directly modulated DFB laser-based 25 km SMF IMDD systems," Opt.
Exp. 18, 21100-21110
(2010).

R. P. Giddings, J. M. Tang, "Experimental demonstration and optimisation of a synchronous clock recovery technique for real-time
end-to-end optical OFDM transmission at 11.25 Gb/s over 25 km SSMF," Opt. Exp.
19, 2831-2845 (2011).

Q. Yang, S. Chen, Y. Ma, W. Shieh, "Real time reception of multi-gigabit coherent optical OFDM signals," Opt. Exp. 17, 7985-7992 (2009).

X.Q. Jin, E. Hugues-Salas, R.P. Giddings, J.L. Wei, J. Groenewald, J.M. Tang, "First real-time experimental
demonstrations of 11.25 Gb/s optical OFDMA PONs with adaptive dynamic bandwidth allocation," Opt. Exp. 19, 20557-20570 (2011).

R.P. Giddings, E. Hugues-Salas, J.M. Tang, "Experimental demonstration of
record high 19.125 Gb/s real-time end-to-end dual-band optical OFDM transmission over 25 km SMF in a simple
EML-based IMDD system," Opt. Exp. 20, 20666-20679 (2012
).

Q. W. Zhang, E. Hugues-Salas, R. P. Giddings, M. Wang, J. M. Tang, "Experimental demonstrations of record high REAM intensity modulator-enabled 19.25 Gb/s real-time
end-to-end dual-band optical OFDM colorless transmissions over 25 km SSMF IMDD systems," Opt. Exp. 21, 9167-9179 (2013).

R. P. Giddings, X. Q. Jin, J. M. Tang, "Experimental demonstration of
real-time 3 Gb/s optical OFDM transceivers," Opt. Exp. 17
, 16654-16665 (2009).

R. P. Giddings, X.Q. Jin, J.M. Tang, "First experimental
demonstration of 6 Gb/s real-time optical OFDM transceivers incorporating channel estimation and variable power
loading," Opt. Exp. 17, 19727-19738 (2009).

R. Bouziane, P. Milder, R. Koutsoyannis, Y. Benlachtar, J. C. Hoe, M. Püschel, M. Glick, R. I. Killey, "Design studies for ASIC implementations of 28 GS/s optical QPSK- and 16-QAM-OFDM transceivers
," Opt. Exp. 19,
20857-20864 (2011).

R. P. Giddings, X. Q. Jin, E. Hugues-Salas, E. Giacoumidis, J. L. Wei, J. M. Tang, "Experimental demonstration of
a record high 11.25 Gb/s real-time optical OFDM transceiver supporting 25 km SMF end-to-end transmission in
simple IMDD systems," Opt. Exp. 18, 5541-5555 (2010).

Y. Benlachtar, P. M. Watts, R. Bouziane, P. Milder, D. Rangaraj, A. Cartolano, R. Koutsoyannis, J. C. Hoe, M. Püschel, M. Glick, R. I. Killey, "Generation of optical OFDM signals using 21.4 GS/s real time digital signal processing
," Opt. Exp. 17,
17658-17668 (2009).

R. P. Giddings, E. Hugues-Salas, X.Q. Jin, J. L. Wei, J. M. Tang, "Experimental demonstration of real-time optical OFDM transmission at 7.5 Gb/s over 25-km SSMF using a
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