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

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Impact of PMD in single-receiver and
polarization-diverse direct-detection optical OFDM," J. Lightw. Technol. 27, 2792-2799 (2009).

C. R. S. Fludger, T. Duthel, D. van den Borne, C. Schulien, E. D. Schmidt, T. Wuth, J. Geyer, E. De Man, G.-D. Khoe, H. de Waardt, "Coherent equalization and POLMUX-RZ-DQPSK for robust
100-GE transmission," J. Lightw. Technol. 26, 64-72 (2008).

W. Shieh, Q. Yang, Y. Ma, "107 Gb/s coherent optical OFDM transmission over
1000-km SSMF fiber using orthogonal band multiplexing," Opt. Exp. 16, 6378-6386 (2008).

X. Yi, W. Shieh, Y. Ma, "Phase noise effects on high spectral efficiency
coherent optical OFDM transmission," J. Lightw. Technol. 26, 1309-1316 (2008).

A. J. Lowery, "Amplified-spontaneous noise limit of optical OFDM
lightwave systems," Opt. Exp. 16, 860-865 (2008).

A. Carena, V. Curri, P. Poggiolini, F. Forghieri, "Dynamic range of single-ended detection receivers for
100 GE coherent PM-QPSK," IEEE Photon. Technol. Lett. 20, 1281-1283 (2008).

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Experimental demonstrations of electronic dispersion
compensation for long-haul transmission using direct-detection
optical OFDM," J. Lightw. Technol. 26, 196-203 (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, "PMD-supported coherent optical OFDM systems," IEEE Photon. Technol. Lett. 19, 134-136 (2007).

W. Shieh, C. Athaudage, "Coherent optical orthogonal frequency division
multiplexing," Electron. Lett. 42, 587-588 (2006).

I. B. Djordjevic, B. Vasic, "Orthogonal frequency division multiplexing for
high-speed optical transmission," Opt. Exp. 14, 3767-3775 (2006).

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

A. D. Ellis, F. C. G. Gunning, "Spectral density enhancement using coherent WDM," IEEE Photon. Technol. Lett. 17, 504-506 (2005).

S. T. Chung, A. J. Goldsmith, "Degrees of freedom in adaptive modulation: A unified
view," IEEE Trans. Commun. 49, 1561-1571 (2001).

W. Shieh, C. Athaudage, "Coherent optical orthogonal frequency division
multiplexing," Electron. Lett. 42, 587-588 (2006).

W. Shieh, "PMD-supported coherent optical OFDM systems," IEEE Photon. Technol. Lett. 19, 134-136 (2007).

A. D. Ellis, F. C. G. Gunning, "Spectral density enhancement using coherent WDM," IEEE Photon. Technol. Lett. 17, 504-506 (2005).

A. Carena, V. Curri, P. Poggiolini, F. Forghieri, "Dynamic range of single-ended detection receivers for
100 GE coherent PM-QPSK," IEEE Photon. Technol. Lett. 20, 1281-1283 (2008).

S. T. Chung, A. J. Goldsmith, "Degrees of freedom in adaptive modulation: A unified
view," IEEE Trans. Commun. 49, 1561-1571 (2001).

X. Yi, W. Shieh, Y. Ma, "Phase noise effects on high spectral efficiency
coherent optical OFDM transmission," J. Lightw. Technol. 26, 1309-1316 (2008).

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

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

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Impact of PMD in single-receiver and
polarization-diverse direct-detection optical OFDM," J. Lightw. Technol. 27, 2792-2799 (2009).

C. R. S. Fludger, T. Duthel, D. van den Borne, C. Schulien, E. D. Schmidt, T. Wuth, J. Geyer, E. De Man, G.-D. Khoe, H. de Waardt, "Coherent equalization and POLMUX-RZ-DQPSK for robust
100-GE transmission," J. Lightw. Technol. 26, 64-72 (2008).

I. B. Djordjevic, B. Vasic, "Orthogonal frequency division multiplexing for
high-speed optical transmission," Opt. Exp. 14, 3767-3775 (2006).

W. Shieh, Q. Yang, Y. Ma, "107 Gb/s coherent optical OFDM transmission over
1000-km SSMF fiber using orthogonal band multiplexing," Opt. Exp. 16, 6378-6386 (2008).

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

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

A. J. Lowery, "Amplified-spontaneous noise limit of optical OFDM
lightwave systems," Opt. Exp. 16, 860-865 (2008).

L. Xu, J. Hu, D. Qian, T. Wang, "Coherent optical OFDM systems using self optical
carrier extraction," Opt. Fiber Commun. (OFC 2008) San DiegoCA () .

C. Xie, "PMD insensitive direct-detection optical OFDM systems
using self-polarization diversity," Opt. Fiber Commun. (OFC 2008) San DiegoCA () .

S. L. Jansen, I. Morita, N. Tadeka, H. Tanaka, "20-Gb/s OFDM transmission over 4 160-km SSMF enabled
by RF-pilot tone phase noise compensation," Opt. Fiber Telecommun. AnaheimCA (2007) Paper PDP15.

B. J. C. Schmidt, A. J. Lowery, J. Armstrong, "Experimental demonstrations of 20 Gbit/s
direct-detection optical OFDM and 12 Gbit/s with a colorless
transmitter," Opt. Fiber Commun. AnaheimCA (2007) Paper PDP18.

W.-R. Peng, X. Wu, V. R. Arbab, B. Shamee, L. C. Christen, J.-Y. Yang, K.-M. Feng, A. E. Willner, C. Sien, "Experimental demonstration of a coherently modulated
and directly detected optical OFDM system using an RF-tone insertion," Opt. Fiber Commun. San DiegoCA (2008) Paper OMU2.

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, S. Matsuoka, R. Kudo, K. Ishihara, Y. Takatori, M. Mizoguchi, K. Okada, K. Hagimoto, H. Yamazaki, S. Kamei, H. Ishii, "13.4-Tb/s (134$\,\times\,$111-Gb/s/ch) no-guard-interval coherent OFDM transmission
over 3 600 km of SMF with 19-ps average PMD," Proc. 34th Eur. Conf. Opt. Commun. (ECOC) (2008) pp. 1-2.

B. J. C. Schmidt, Z. Zan, L. B. Du, A. J. Lowery, "100 Gbit/s transmission using single-band
direct-detection optical OFDM," Opt. Fiber Commun. (OFC 2009) San DiegoCA () paper PD3.

D. Qian, N. Cvijetic, J. Hu, T. Wang, "108 Gb/s OFDMA-PON with polarization multiplexing and
direct-detection," Opt. Fiber Commun. (OFC 2009) San DiegoCA () Paper PD5.

B. J. C. Schmidt, A. J. Lowery, L. B. Du, "Low sample rate transmitter for direct-detection
optical OFDM," Opt. Fiber Telecommun. (OFC 2009) San DiegoCA () Paper OWM4.

A. J. Lowery, "Improving sensitivity and spectral efficiency in
direct-detection optical OFDM systems," Opt. Fiber Telecommun. (OFC 2008) San DiegoCA () Paper OMM4.

H. Takahashi, A. Al Amin, S. L. Jansen, I. Morita, H. Tanaka, "8$\,\times\,$66.8-Gbit/s coherent PDM-OFDM transmission over 640 km of
SSMF at 5.6-bit/s/Hz spectral efficiency," Proc. 34th Eur. Conf. Opt. Commun. 2008 (ECOC) pp. 1-2.

H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "DWDM transmission with 7.0-bit/s/Hz spectral
efficiency using 8$\,\times\,$65.1-Gbit/s coherent PDM-OFDM signals," Opt. Fiber Commun. (OFC 2009) San DiegoCA () Paper PDPB7.

J. Yu, D. Qian, T. Wang, G. Zhang, P. D. Magill, "8$\,\times\,$114 Gb/s, 25-GHz-spaced, PolMux-RZ-8 PSK transmission over
640 km of SSMF employing digital coherent detection and EDFA-only
amplification," Opt. Fiber Commun. San DiegoCA (2008) Paper PDP1.

A. J. Lowery, L. Du, J. Armstrong, "Orthogonal frequency division multiplexing for
adaptive dispersion compensation in long haul WDM systems," Opt. Fiber Commun. (OFC 2006) AnaheimCA () Paper PDP39.

H. Bülow, "Tutorial: Electronic dispersion compensation," Opt. Fiber Telecommun. AnaheimCA (2007) Paper OMG5.

M. Cvijetic, "Towards 100 GbE introduction: Challenges and practical
aspects," 10th Anniversary Int. Conf. Transparent Opt. Netw. 2008
(ICTON 2008) AthensGreece () Paper 1–4.