S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "121.9-Gb/s PMD-OFDM transmission with 2-b/s/Hz
spectral efficiency over 1000-km of SSMF," J. Lightw. Technol. 27, 177-188 (2009).

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

Q. Yang, Y. Tang, Y. Ma, W. Shieh, "Experimental demonstration and numerical simulation of
107-Gb/s high spectral efficiency coherent optical OFDM," J. Lightw. Technol. 27, 168-176 (2009).

A. J. Lowery, L. B. Du, J. Armstrong, "Performance of optical OFDM in ultralong-haul WDM
lightwave systems," J. Lightw. Technol. 25, 131-138 (2008).

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Experimental demonstration of electronic dispersion
compensation for long-haul transmission using direct-detection
optical OFDM," J. Lightw. Technol. 26, 196-203 (2008).

S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s OFDM transmission over
4160-km SSMF," J. Lightw. Technol. 26, 6-15 (2008).

S. C. J. Lee, F. Breyer, S. Randel, H. P. A. Van Den Boom, A. M. J. Koonen, "High-speed transmission over multimode fiber using
discrete multitone modulation," J. Opt. Netw. 7, 183-196 (2008).

W. Shieh, H. Bao, Y. Tang, "Coherent optical OFDM: Theory and design," Opt. Exp. 16, 841-859 (2008).

J. Armstrong, B. J. C. Schmidt, "Comparison of asymmetrically clipped optical OFDM and
DC-biased optical OFDM in AWGN," IEEE Commun. Lett. 12, 343-345 (2008).

R. Merched, "On OFDM and single-carrier frequency-domain systems
based on trigonometric transforms," IEEE Signal Process. Lett. 13, 473-476 (2006).

A. J. Lowery, J. Armstrong, "Orthogonal-frequency-division multiplexing for
dispersion compensation of long haul optical systems," Opt. Exp. 14, 2079-2084 (2006).

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 46, 370-372 (2006).

W. Shieh, C. Athaudage, "Coherent optical orthogonal frequency division
multiplexing," Electron. Lett. 42, 587-589 (2006).

G. D. Mandyam, "Sinusidal transforms in OFDM systems," IEEE Trans. Broadcast. 50, 172-184 (2004).

P. Duhamel, M. Vetterli, "Improved Fourier and Hartley transform algorithms:
Application to cyclic convolution of real data," IEEE Trans. Acoust., Speech, Signal Process. ASSP-35, 818-824 (1987).

H. S. Hou, "The fast Hartley transform algorithm," IEEE Trans. Comput. C-36, 147-156 (1987).

H. V. Sorensen, D. L. Jones, C. S. Burrus, M. T. Heideman, "On computing the discrete Hartley transform," IEEE Trans. Acoust., Speech, Signal Process. ASSP-33, 1231-1238 (1985).

R. N. Bracewell, "The fast Hartley transform," Proc. IEEE 72, 1010-1018 (1984).

R. N. Bracewell, "Discrete Hartley transform," J. Opt. Soc. Amer. 73, 1832-1835 (1983).

W. Shieh, C. Athaudage, "Coherent optical orthogonal frequency division
multiplexing," Electron. Lett. 42, 587-589 (2006).

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 46, 370-372 (2006).

J. Armstrong, B. J. C. Schmidt, "Comparison of asymmetrically clipped optical OFDM and
DC-biased optical OFDM in AWGN," IEEE Commun. Lett. 12, 343-345 (2008).

R. Merched, "On OFDM and single-carrier frequency-domain systems
based on trigonometric transforms," IEEE Signal Process. Lett. 13, 473-476 (2006).

H. V. Sorensen, D. L. Jones, C. S. Burrus, M. T. Heideman, "On computing the discrete Hartley transform," IEEE Trans. Acoust., Speech, Signal Process. ASSP-33, 1231-1238 (1985).

P. Duhamel, M. Vetterli, "Improved Fourier and Hartley transform algorithms:
Application to cyclic convolution of real data," IEEE Trans. Acoust., Speech, Signal Process. ASSP-35, 818-824 (1987).

G. D. Mandyam, "Sinusidal transforms in OFDM systems," IEEE Trans. Broadcast. 50, 172-184 (2004).

H. S. Hou, "The fast Hartley transform algorithm," IEEE Trans. Comput. C-36, 147-156 (1987).

Q. Yang, Y. Tang, Y. Ma, W. Shieh, "Experimental demonstration and numerical simulation of
107-Gb/s high spectral efficiency coherent optical OFDM," J. Lightw. Technol. 27, 168-176 (2009).

A. J. Lowery, L. B. Du, J. Armstrong, "Performance of optical OFDM in ultralong-haul WDM
lightwave systems," J. Lightw. Technol. 25, 131-138 (2008).

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Experimental demonstration of electronic dispersion
compensation for long-haul transmission using direct-detection
optical OFDM," J. Lightw. Technol. 26, 196-203 (2008).

S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s OFDM transmission over
4160-km SSMF," J. Lightw. Technol. 26, 6-15 (2008).

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "121.9-Gb/s PMD-OFDM transmission with 2-b/s/Hz
spectral efficiency over 1000-km of SSMF," J. Lightw. Technol. 27, 177-188 (2009).

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

R. N. Bracewell, "Discrete Hartley transform," J. Opt. Soc. Amer. 73, 1832-1835 (1983).

W. Shieh, H. Bao, Y. Tang, "Coherent optical OFDM: Theory and design," Opt. Exp. 16, 841-859 (2008).

A. J. Lowery, J. Armstrong, "Orthogonal-frequency-division multiplexing for
dispersion compensation of long haul optical systems," Opt. Exp. 14, 2079-2084 (2006).

R. N. Bracewell, "The fast Hartley transform," Proc. IEEE 72, 1010-1018 (1984).

P. Duhamel, M. Vetterli, "Cyclic convolution of real sequences: Hartley versus
Fouroer and new schemes," Proc. Int Conf. Acoust., Speech, Signal Process. (ICASSP
1986) pp. 229-232.

D. Wang, D. Liu, F. Liu, G. Yue, "A novel DHT-based ultra-wideband system," Proc. ISCIT 2005 (2004) pp. 172-184.

A. J. Lowery, J. Armstrong, "Comparison of power-efficientoptical orthogonal
frequency division multiplexing transmission methods," Conf. Optical Fibre Technology/Australian Optical Society MelbourneAustralia (2006).

J. Armstrong, B. J. C. Schmidt, D. Kalra, H. A. Suraweera, A. J. Lowery, "Performance of asymmetrically clipped optical OFDM in
AWGN for an intensity modulated direct detection system," Proc. IEEE Global Telecommun. Conf. (2006) pp. 1-5.

A. J. Lowery, J. Armstrong, "Dispersion compensation in long haul transmission
systems—An orthogonal approach," Conf. Optical Internet 2007 MelbourneAustralia ().

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Experimental demonstration of 20 Gbit/s
direct-detection optical OFDM and 12 Gbit/s with a colorless
transmitter," Optical Fiber Communication Conf. 2007 AnaheimCA () Paper PDP 18.

S. L. Jansen, I. Morita, T. C. W. Schenk, D. van den Borne, H. Tanaka, "Optical OFDM—A candidate for future
long-haul optical transmission systems," Proc. Opt. Fiber Commun. Conf. (2008) pp. 1-3.

A. J. Lowery, "Optical OFDM," Proc. CLEO/QELS 2008 () pp. 1-2.

M. S. Moreolo, V. Sacchieri, G. Cincotti, "Signal processing based on trigonometric transforms
for high-speed optical networks," Int. Conf. Transparent Optical Networks (ICTON 2009) Island of São Miguel, AzoresPortugal ().

S. C. J. Lee, F. Breyer, S. Randel, M. Schuster, J. Zeng, F. Huijskens, H. P. A. van den Boom, A. M. J. Koonen, N. Hanik, "24-Gb/s transmission over 730 m of multimode fiber by
direct modulation of an 850-nm VCSEL using discrete multi-tone
modulation," Optical Fiber Communication Conf. 2007 AnaheimCA (2007) PDP 6.