A. Gnauck, G. Charlet, P. Tran, P. Winzer, C. Doerr, J. Centanni, E. Burrows, T. Kawanishi, T. Sakamoto, K. Higuma, "25.6-Tb/s WDM transmission of polarization-multiplexed RZ-DQPSK
signals," J. Lightw. Technol. 26, 79-84 (2008).

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

J. Renaudier, G. Charlet, M. Salsi, O. B. Pardo, H. Mardoyan, P. Tran, S. Bigo, "Linear fiber impairments mitigation of 40-Gbit/s polarization-multiplexed
QPSK by digital processing in a coherent receiver," J.
Lightw. Technol. 26, 36-42 (2008).

O. Bertran-Pardo, J. Renaudier, G. Charlet, H. Mardoyan, P. Tran, S. Bigo, "Nonlinearity limitations when mixing 40-Gb/s coherent PDM-QPSK
channels with preexisting 10-Gb/s NRZ channels," IEEE
Photon. Technol. Lett. 20, 1314-1316 (2008).

A. Bononi, P. Serena, M. Bertolini, "Unified analysis of weakly-nonlinear
dispersion-managed optical transmission systems from perturbative approach," C. R. Physique 9, 947-962 (2008).

A. Bononi, P. Serena, A. Orlandini, "A unified design framework
for single-channel dispersion-managed terrestrial systems," J. Lightw. Technol. 26, 3617-3631 (2008).

E. Ip, J. Kahn, "Feedforward carrier recovery for coherent
optical communications," J. Lightw. Technol. 25, 2675-2692 (2007).

R. Luis, B. Clouet, A. Teixeira, P. Monteiro, "Pump-probe analysis of the
cross-phase modulation degradation induced by 10 Gbit/s amplitude-shift-keyed
signals on 40 Gbit/s DPSK signals," Opt. Lett. 32, 2786 (2007).

S. Chandrasekhar, X. Liu, "Impact of channel plan and dispersion map
on hybrid DWDM transmission of 42.7-Gb/s DQPSK and 10.7-Gb/s OOK on 50-GHz
grid," IEEE Photon. Technol. Lett. 19, 1801-1803 (2007).

D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent detection of optical quadrature
phase-shift keying signals with carrier phase estimation," J. Lightw. Technol. 24, 12-21 (2006).

P. Serena, A. Orlandini, A. Bononi, "Parametric-gain approach to
the analysis of single-channel DPSK/DQPSK systems with nonlinear phase noise," J. Lightw. Technol. 24, 2026-2037 (2006).

R. Luis, A. Cartaxo, "Analytical characterization
of SPM impact on XPM-induced degradation in dispersion-compensated WDM systems," J. Lightw. Technol. 23, 1503-1513 (2005).

K.-P. Ho, "Error probability of DPSK signals
with cross-phase modulation induced nonlinear phase noise," IEEE J. Sel. Topics Quantum Electron. 10, 421-427 (2004).

K.-P. Ho, "The effect of interferometer
phase error on direct-detection DPSK and DQPSK signals," IEEE Photon. Technol. Lett. 16, 308-310 (2004).

R. Killey, H. Thiele, V. Mikhailov, P. Bayvel, "Prediction of transmission
penalties due to cross-phase modulation in WDM systems using a simplified
technique," IEEE Photon. Technol. Lett. 12, 804-806 (2000).

A. Cartaxo, "Cross-phase modulation in intensity
modulation-direct detection WDM systems with multiple optical amplifiers and
dispersion compensators," J. Lightw. Technol. 17, 178-190 (1999).

R. Hui, Y. Wang, K. Demarest, C. Allen, "Frequency response of cross-phase modulation in multispan
WDM optical fiber systems," IEEE Photon. Technol.
Lett. 10, 1271-1273 (1998).

A. Cartaxo, "Impact of modulation frequency
on cross-phase modulation effect in intensity modulation-direct detection
WDM systems," IEEE Photon. Technol. Lett. 10, 1268-1270 (1998).

G. Bellotti, M. Varani, C. Francia, A. Bononi, "Intensity distortion induced
by cross-phase modulation and chromatic dispersion in optical-fiber transmissions
with dispersion compensation," IEEE Photon.
Technol. Lett. 10, 1745-1747 (1998).

A. Bononi, C. Francia, G. Bellotti, "Impulse response of cross-phase
modulation filters in multi-span transmission systems with dispersion compensation," Opt. Fiber Technol. 4, 371-383 (1998).

T.-K. Chiang, N. Kagi, M. Marhic, L. Kazovsky, "Cross-phase modulation in fiber links with
multiple optical amplifiers and dispersion compensators," J. Lightw. Technol. 14, 249-260 (1996).

J. Wang, K. Petermann, "Small signal analysis for dispersive
optical fiber communication systems," J. Lightw.
Technol. 10, 96-100 (1992).

J. Gordon, L. Mollenauer, "Phase noise in photonic communications
systems using linear amplifiers," Opt. Lett 15, 1351-1353 (1990).

G. Nicholson, "Probability of error for optical
heterodyne DPSK system with quantum phase noise," Electron.
Lett. 20, 1005-1007 (1984) 22.

A. J. Viterbi, A. M. Viterbi, "Nonlinear estimation of PSK-modulated
carrier phase with application to burst digital transmission," IEEE Trans. Inf. Theory 29, 543-551 (1983).

R. Pawula, S. Rice, J. Roberts, "Distribution of the phase angle between
two vectors perturbed by Gaussian noise," IEEE
Trans. Commun. 30, 1828-1841 (1982).

N. Blachman, "The effect of phase error on
DPSK error probability," IEEE Trans. Commun. 29, 364-365 (1981).

E. Bedrosian, S. Rice, "Distortion and crosstalk of linearly filtered,
angle modulated signals," Proc. IEEE 56, 2-13 (1968).

A. Bononi, P. Serena, M. Bertolini, "Unified analysis of weakly-nonlinear
dispersion-managed optical transmission systems from perturbative approach," C. R. Physique 9, 947-962 (2008).

G. Nicholson, "Probability of error for optical
heterodyne DPSK system with quantum phase noise," Electron.
Lett. 20, 1005-1007 (1984) 22.

O. Bertran-Pardo, J. Renaudier, G. Charlet, H. Mardoyan, P. Tran, S. Bigo, "Nonlinearity limitations when mixing 40-Gb/s coherent PDM-QPSK
channels with preexisting 10-Gb/s NRZ channels," IEEE
Photon. Technol. Lett. 20, 1314-1316 (2008).

R. Pawula, S. Rice, J. Roberts, "Distribution of the phase angle between
two vectors perturbed by Gaussian noise," IEEE
Trans. Commun. 30, 1828-1841 (1982).

K.-P. Ho, "Error probability of DPSK signals
with cross-phase modulation induced nonlinear phase noise," IEEE J. Sel. Topics Quantum Electron. 10, 421-427 (2004).

G. Bellotti, M. Varani, C. Francia, A. Bononi, "Intensity distortion induced
by cross-phase modulation and chromatic dispersion in optical-fiber transmissions
with dispersion compensation," IEEE Photon.
Technol. Lett. 10, 1745-1747 (1998).

R. Hui, Y. Wang, K. Demarest, C. Allen, "Frequency response of cross-phase modulation in multispan
WDM optical fiber systems," IEEE Photon. Technol.
Lett. 10, 1271-1273 (1998).

A. Cartaxo, "Impact of modulation frequency
on cross-phase modulation effect in intensity modulation-direct detection
WDM systems," IEEE Photon. Technol. Lett. 10, 1268-1270 (1998).

R. Killey, H. Thiele, V. Mikhailov, P. Bayvel, "Prediction of transmission
penalties due to cross-phase modulation in WDM systems using a simplified
technique," IEEE Photon. Technol. Lett. 12, 804-806 (2000).

K.-P. Ho, "The effect of interferometer
phase error on direct-detection DPSK and DQPSK signals," IEEE Photon. Technol. Lett. 16, 308-310 (2004).

S. Chandrasekhar, X. Liu, "Impact of channel plan and dispersion map
on hybrid DWDM transmission of 42.7-Gb/s DQPSK and 10.7-Gb/s OOK on 50-GHz
grid," IEEE Photon. Technol. Lett. 19, 1801-1803 (2007).

N. Blachman, "The effect of phase error on
DPSK error probability," IEEE Trans. Commun. 29, 364-365 (1981).

A. J. Viterbi, A. M. Viterbi, "Nonlinear estimation of PSK-modulated
carrier phase with application to burst digital transmission," IEEE Trans. Inf. Theory 29, 543-551 (1983).

J. Renaudier, G. Charlet, M. Salsi, O. B. Pardo, H. Mardoyan, P. Tran, S. Bigo, "Linear fiber impairments mitigation of 40-Gbit/s polarization-multiplexed
QPSK by digital processing in a coherent receiver," J.
Lightw. Technol. 26, 36-42 (2008).

J. Wang, K. Petermann, "Small signal analysis for dispersive
optical fiber communication systems," J. Lightw.
Technol. 10, 96-100 (1992).

A. Gnauck, G. Charlet, P. Tran, P. Winzer, C. Doerr, J. Centanni, E. Burrows, T. Kawanishi, T. Sakamoto, K. Higuma, "25.6-Tb/s WDM transmission of polarization-multiplexed RZ-DQPSK
signals," J. Lightw. Technol. 26, 79-84 (2008).

E. Ip, J. Kahn, "Feedforward carrier recovery for coherent
optical communications," J. Lightw. Technol. 25, 2675-2692 (2007).

D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent detection of optical quadrature
phase-shift keying signals with carrier phase estimation," J. Lightw. Technol. 24, 12-21 (2006).

A. Bononi, P. Serena, A. Orlandini, "A unified design framework
for single-channel dispersion-managed terrestrial systems," J. Lightw. Technol. 26, 3617-3631 (2008).

T.-K. Chiang, N. Kagi, M. Marhic, L. Kazovsky, "Cross-phase modulation in fiber links with
multiple optical amplifiers and dispersion compensators," J. Lightw. Technol. 14, 249-260 (1996).

R. Luis, A. Cartaxo, "Analytical characterization
of SPM impact on XPM-induced degradation in dispersion-compensated WDM systems," J. Lightw. Technol. 23, 1503-1513 (2005).

A. Cartaxo, "Cross-phase modulation in intensity
modulation-direct detection WDM systems with multiple optical amplifiers and
dispersion compensators," J. Lightw. Technol. 17, 178-190 (1999).

P. Serena, A. Orlandini, A. Bononi, "Parametric-gain approach to
the analysis of single-channel DPSK/DQPSK systems with nonlinear phase noise," J. Lightw. Technol. 24, 2026-2037 (2006).

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

A. Bononi, C. Francia, G. Bellotti, "Impulse response of cross-phase
modulation filters in multi-span transmission systems with dispersion compensation," Opt. Fiber Technol. 4, 371-383 (1998).

J. Gordon, L. Mollenauer, "Phase noise in photonic communications
systems using linear amplifiers," Opt. Lett 15, 1351-1353 (1990).

E. Bedrosian, S. Rice, "Distortion and crosstalk of linearly filtered,
angle modulated signals," Proc. IEEE 56, 2-13 (1968).

C. Fürst, "43 Gb/s RZ-DQPSK DWDM
field trial over 1047 km with mixed 43 Gb/s and 10.7 Gb/s channels at 50 and
100 GHz channel spacing," Proc. ECOC 2006 (2006) PDP Th4.1.4.

H. Griesser, "43 Gb/s RZ-DQPSK transmission
over a 660 km 10.7 Gb/s DWDM link," Proc. ECOC
2006 (2006) paper Th1.6.6.

S. Bigo, G. Charlet, O. Bertrand Pardo, J. Renaudier, "Characterization of the impact
of non-linear effects in coherent transmission experiments," Digest of the IEEE/LEOS Summer Topical Meetings 2008 (2008) pp. 125-126.

H. Griesser, J. Elbers, "Influence of cross-phase modulation
induced nonlinear phase noise on DQPSK signals from neighbouring OOK channels," Proc. ECOC 2005 (2005) paper Tu1. 2.2.

M. Bertolini, P. Serena, N. Rossi, A. Bononi, "Numerical Monte Carlo comparison between
coherent PDM-QPSK/OOK and incoherent DQPSK/OOK hybrid systems," Proc. ECOC2008 (2008) paper P.4.15.

Y. Frignac, J.-C. Antona, S. Bigo, "Enhanced analytical engineering rule for
fast optimization dispersion maps in 40 Gbit/s-based transmission," Proc. OFC 2004 (2008) Paper OTuN3.

M. Varani, G. Bellotti, A. Bononi, C. Francia, "Analysis of cross-phase modulation
induced intensity noise in high-speed dispersion compensated transmission
systems," Proc. LEOS '98 (1998) paper WBB4.

A. Bononi, G. Bellotti, M. Varani, C. Francia, Optical Networking (Springer-Verlag, 1999) pp. 383-398.

O. Vassilieva, T. Hoshida, J. C. Rasmussen, T. Naito, "Symbol rate dependency of XPM-induced phase
noise penalty on QPSK-based modulation formats," Proc.
ECOC 2008 (2008) paper We.1.E.4.

K.-P. Ho, Phase-Modulated Optical Communication
Systems (Springer, 2005).

R. Luis, B. Clouet, A. Teixeira, P. Monteiro, "Analytical modeling of the
cross-phase modulation-induced degradation in mixed DPSK and ASK transmission
systems," Proc. ICTON 2007 (2007) paper Mo.P.17.