J. D'Ambrosia, "100 gagabit ethernet and beyond," IEEE Commun. Mag. 48, S6-S13 (2010).

P. J. Winzer, "Beyond 100G ethernet," IEEE Commun. Mag. 48, 26-30 (2010).

R. W. Tkach, "Scaling optical communications for the next decade and
beyond," Bell Labs Tech. J. 14, 3-10 (2010).

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, R. Kudo, K. Ishihara, Y. Takatori, "No-guard-interval coherent optical OFDM for 100-Gb/s
long-haul WDM transmission," J. Lightw. Technol. 27, 3705-3713 (2009).

P. Poggiolini, A. Carena, V. Curri, F. Forghieri, "Evaluation of the computational effort for chromatic
dispersion compensation in coherent optical PM-OFDM and PM-QAM
systems," Opt. Exp. 17, 1385-1403 (2009).

R. Kudo, T. Kobayashi, K. Ishihara, Y. Takatori, A. Sano, Y. Miyamoto, "Coherent optical single carrier transmission using
overlap frequency domain equalization for long-haul optical systems," J. Lightw. Technol. 27, 3721-3728 (2009).

X. Liu, F. Buchali, R. W. Tkach, "Improving the nonlinear tolerance of
polarization-division-multiplexed CO-OFDM in long-haul fiber
transmission," J. Lightw. Technol. 27, 3632-3640 (2009).

H. Sun, K.-T. Wu, K. Roberts, "Real-time measurements of a 40 Gb/s coherent system," Opt. Exp. 16, 873-879 (2008).

X. Liu, F. Buchali, "Intra-symbol frequency-domain averaging based channel
estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).

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

S. L. Jansen, I. Morita, T. C. Schenk, H. Tanaka, "Long-haul transmission of 16$\,\times\,$52.5 Gbits/s polarization-division- multiplexed OFDM
enabled by MIMO processing (Invited)," J. Opt. Netw. 7, 173-182 (2008).

A. J. Lowery, "Fiber nonlinearity pre- and post-compensation for
long-haul optical links using OFDM," Opt. Exp. 15, 12965 (2007).

R. W. Tkach, "Scaling optical communications for the next decade and
beyond," Bell Labs Tech. J. 14, 3-10 (2010).

J. D'Ambrosia, "100 gagabit ethernet and beyond," IEEE Commun. Mag. 48, S6-S13 (2010).

P. J. Winzer, "Beyond 100G ethernet," IEEE Commun. Mag. 48, 26-30 (2010).

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, R. Kudo, K. Ishihara, Y. Takatori, "No-guard-interval coherent optical OFDM for 100-Gb/s
long-haul WDM transmission," J. Lightw. Technol. 27, 3705-3713 (2009).

X. Liu, F. Buchali, R. W. Tkach, "Improving the nonlinear tolerance of
polarization-division-multiplexed CO-OFDM in long-haul fiber
transmission," J. Lightw. Technol. 27, 3632-3640 (2009).

R. Kudo, T. Kobayashi, K. Ishihara, Y. Takatori, A. Sano, Y. Miyamoto, "Coherent optical single carrier transmission using
overlap frequency domain equalization for long-haul optical systems," J. Lightw. Technol. 27, 3721-3728 (2009).

P. Poggiolini, A. Carena, V. Curri, F. Forghieri, "Evaluation of the computational effort for chromatic
dispersion compensation in coherent optical PM-OFDM and PM-QAM
systems," Opt. Exp. 17, 1385-1403 (2009).

X. Liu, F. Buchali, "Intra-symbol frequency-domain averaging based channel
estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).

H. Sun, K.-T. Wu, K. Roberts, "Real-time measurements of a 40 Gb/s coherent system," Opt. Exp. 16, 873-879 (2008).

A. J. Lowery, "Fiber nonlinearity pre- and post-compensation for
long-haul optical links using OFDM," Opt. Exp. 15, 12965 (2007).

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

S. Oda, T. Tanimura, T. Hoshida, C. Ohshima, H. Nakashima, Z. Tao, J. C. Rasmussen, "112 Gb/s DP-QPSK transmission using a novel nonlinear
compensator in digital coherent receiver," Proc. OFC'09 .

D. S. Millar, S. Makovejs, V. Mikhailov, R. I. Killey, P. Bayvel, S. J. Savory, "Experimental comparison of nonlinear compensation in
long-haul PDM-QPSK transmission at 42.7 and 85.4 Gb/s," Proc. ECOC'09 .

ITU-T Recommendation G.975.1 (2004) Appendix I.9.

X. Liu, S. Chandrasekhar, B. Zhu, P. J. Winzer, D. W. Peckham, "7$\,\times\,$224-Gb/s WDM transmission of reduced-guard-interval
CO-OFDM with 16-QAM subcarrier modulation on a 50-GHz Grid over 2000
km of ULAF and five ROADM passes," ECOC'10 Paper Tu.3.C.2.

http://cp.literature.agilent.com/litweb/pdf/5990-5512EN.pdf.

A. R. Chraplyvy, "The coming capacity crunch," ECOC Plenary Talk (2009).

A. D. Ellis, F. C. G. Gunning, B. Cuenot, T. C. Healy, E. Pincemin, "Towards 1TbE using coherent WDM," Proc. OECC/ACOFT 2008 (2008).

Y. Ma, Q. Yang, Y. Tang, S. Chen, W. Shieh, "1-Tb/s per channel coherent optical OFDM transmission
with subwavelength bandwidth access," Proc. OFC'09 .

R. Dischler, F. Buchali, "Transmission of 1.2 Tb/s continuous waveband
PDM-OFDM-FDM signal with spectral efficiency of 3.3 bit/s/Hz over
400 km of SSMF," Proc. OFC'09 .

S. Chandrasekhar, X. Liu, B. Zhu, D. W. Peckham, "Transmission of a 1.2-Tb/s 24-carrier
no-guard-interval coherent OFDM superchannel over 7200-km of
ultra-large-area fiber," Proc. ECOC'09 .

A. H. Gnauck, P. J. Winzer, C. R. Doerr, L. L. Buhl, "10$\,\times\,$112-Gb/s PDM 16-QAM transmission over 630 km of fiber with
6.2-b/s/Hz spectral efficiency," Proc. OFC'09 .

H. Takahashi, "DWDM transmission with 7.0-bit/s/Hz spectral
efficiency using 8$\,\times\,$65.1-Gb/s coherent PDM-OFDM signals," Proc. OFC'09 .

X. Zhou, J. Yu, M.-F. Huang, Y. Shao, T. Wang, L. Nelson, P. Magill, M. Birk, P. I. Borel, D. W. Peckham, R. Lingle, "64-Tb/s (640$\,\times\,$107-Gb/s) PDM-36QAM transmission over 320 km using both
pre- and post-transmission digital equalization," Proc. OFC'10 .

A. Sano, "240-Gb/s polarization-multiplexed 64-QAM modulation
and blind detection using PLC-LN hybrid integrated modulator and
digital coherent receiver," Proc. ECOC'09 .

X. Liu, S. Chandrasekhar, B. Zhu, P. J. Winzer, A. H. Gnauck, D. W. Peckham, "Transmission of a 448-Gb/s reduced-guard-interval
CO-OFDM signal with a 60-GHz optical bandwidth over 2000 km of ULAF
and five 80-GHz-grid ROADMs," Proc. OFC'10 .