C. R. S. Fludger, T. Duthel, D. van den Borne, C. Schulien, E.-D. Schmidt, T. Wuth, E. de Man, G. D. Khoe, H. de Waardt, "10$\,\times\,$111 Gbit/s, 50 GHz spaced, POLMUX-RZ-DQPSK transmission
over 2375 km emplying coherent equalization," presented at the OFC/NFOEC AnaheimCA (2007) Paper PDP22.

D. S. Ly-Gagnon, K. Katoh, K. Kikuchi, "Coherent demodulation of differential 8-phase-shift
keying with optical phase diversity and digital signal processing," Proc. LEOS (2004) pp. 607-608.

G. Charlet, N. Maaref, J. Renaudier, H. Mardoyan, P. Tran, S. Bigo, "Transmission of 40 Gb/s QPSK with coherent detection
over ultra-long distance improved by nonlinearity mitigation," ECOC CannesFrance (2006) Paper Th4.3.4.

K. Kikuchi, M. Fukase, S. Kim, "Electronic postcompensation for nonlinear phase noise
in a 1000-km 20-/s optical QPSK transmission system using the
homodyne receiver with digital signal processing," OFC Los AngelesCA (2007) Paper OTuA2.

R. I. Killey, P. M. Watts, V. Mikhailov, M. Glick, P. Bayvel, "Electric dispersion compensation by signal
predistortion using a dual-drive Mach–Zehnder modulator," OFC/NFOEC AnaheimCA (2005) Paper OThJ2.

E. Yamada, A. Sano, H. Masuda, T. Kobayashi, E. Yoshida, Y. Miyamoto, Y. Hibino, K. Ishihara, Y. Takatori, K. Okada, K. Hagimoto, T. Yamada, H. Yamazaki, "Novel no-guard-interval PDM CO-OFDM transmission in
4.1 Tb/s (50$\,\times\,$88.8-Gb/s) DWDM link over 800 km SMF including 50-GHz
spaced ROADM nodes," OFC/NFOEC San DiegoCA (2008) Paper PDP8.

H. Takahashi, A. A. 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," ECOC BrusselsBelgium (2008) Paper Th.3.E.4.

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, S. Matuoka, 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," ECOC BrusselsBelgium (2008) Paper Th.3.E.1.

G. Charlet, M. Salsi, H. Mardoyan, P. Tran, J. Renaudier, S. Bigo, M. Astruc, P. Sillard, L. Provost, F. Cerou, "Transmission of 16.4 Tbit/s capacity over 2 550 km
using PDM QPSK modulation format and coherent receiver," ECOC BrusselsBelgium (2008) Paper Th.3.E.3.

J. X. Cai, O. V. Sinkin, C. R. Davidson, D. G. Foursa, A. J. Lucero, M. Nissov, A. N. Pilipetskii, W. W. Patterson, N. S. Bergano, "2.4 Tb/s (120$\,\times\,$20 Gb/s) transmission over transoceanic distance using
optimum FEC overhead and 48% spectral efficiency," OFC/NFOEC San DiegoCA (2008) Paper PDP4.

S. L. Jansen, I. Morita, H. Tanaka, "10$\,\times\,$121.9-Gb/s PDM-OFDM transmission with 2-b/s/Hz spectral
efficiency over 1 000 km of SSMF," OFC/NFOEC San DiegoCA (2008) Paper PDP2.

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

E. Yamada, A. Sano, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, K. Yonenaga, Y. Miyamoto, K. Ishihara, Y. Takatori, T. Yamada, H. Yamazaki, "1 Tb/s (111 Gb/s/ch$\,\times\,$10 ch) CO-OFDM transmission over 2100 km DSF with 50 GHz
spacing," OECC SydneyN.S.W.Australia (2008) Paper PDP6.

G. Charlet, J. Renaudier, H. Margoyan, P. Tran, O. B. Pardo, F. Verluise, M. Achnouche, A. Boutin, F. Blache, J. Y. Dupy, S. Bigo, "Transmission of 16.4 Tbit/s capacity over 2 550 km
using PDM QPSK modulation format and coherent receiver," OFC/NFOEC San DiegoCA (2008) Paper PDP3.

C. Laperle, B. Villeneuve, Z. Zhang, D. McGhan, H. Sun, M. O'Sullivian, "Wavelength division multiplexing (WDM) and
polarization mode dispersion (PMD) performance of a coherent 40
Gbit/s dual-polarization quadrature phase shift keying (DP-QPSK)
transceiver," OFC/NFOEC AnaheimCA (2007) Paper PDP16.

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

G. Charlet, J. Rnaudier, M. Salshi, H. Margoyan, P. Tran, S. Bigo, "Efficient mitigation of fiber impairments in an
ultra-long haul transmission of 40 Gbit/s polarization-multiplexed
data, by digital processing in a cohrent receiver," OFC/NFOEC AnaheimCA (2007) Paper PDP17.

F. Inuzuka, E. Yamazaki, Y. Kazushige, A. Takada, "Nonlinear inter-channel crosstalk compensation using
electronic pre-distortion in carrier phase locked WDM," OFC/NFOEC San DiegoCA (2008) Paper OTuO5.

E. Yamazaki, F. Inuzuka, K. Yonenaga, A. Takada, Y. Miyamoto, "Nonlinearity compensation in WDM transmission," LEOS Summer Topicals (2008) pp. 165-166.

E. Yamazaki, F. Inuzuka, K. Yonenaga, A. Takada, "Nonlinear inter-channel crosstalk compensation in
carrier-phase-locked WDM," ECOC CannesFrance (2006) Paper Th3.2.3.

E. Yamazaki, F. Inuzuka, K. Yonenaga, A. Takada, "Compensation of WDM crosstalk in optical fiber
transmission using carrier phase locking," Proc. 2007 IEICE Gen.Conf. pp. S-61-S-62.