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

G. Goldfarb, G. Li, "Efficient backward-propagation using wavelet-based
filtering for fiber backward-propagation," Opt. Exp. 17, 8815-8821 (2009).

Q. Zhang, M. I. Hayee, "Symmetrized split-step Fourier scheme to control
global simulation accuracy in fiber-optic communication systems," J. Lightw. Technol. 26, 302-316 (2008).

D. J. F. Barros, J. M. Kahn, "Optimized dispersion compensation using orthogonal
frequency-division multiplexing," J. Lightw. Technol. 26, 2889-2898 (2008).

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

E. Ip, A. P. T. Lau, D. J. F. Barros, J. M. Kahn, "Coherent detection in optical fiber systems," Opt. Exp. 16, 753-791 (2008).

S. J. Savory, "Digital filters for coherent optical receivers," Opt. Exp. 16, 804-817 (2008).

W. Shieh, K.-P. Ho, "Equalization-enhanced phase noise for
coherent-detection systems using electronic digital signal
processing," Opt. Exp. 16, 15718-15727 (2008).

E. Ip, J. M. Kahn, "Compensation of dispersion and nonlinear impairments
using digital backpropagation," J. Lightw. Technol. 26, 3416-3425 (2008).

E. Mateo, L. Zhu, G. Li, "Impact of XPM and FWM on the digital implementation of
impairment compensation for WDM transmission using backward
propagation," Opt. Exp. 16, 16124-16137 (2008).

A. J. Lowery, "Fiber nonlinearity mitigation in optical links that
use OFDM for dispersion compensation," IEEE Photon. Technol. Lett. 19, 1556-1558 (2007).

W. Shieh, X. Yi, Y. Ma, Y. Tang, "Theoretical and experimental study on PMD-supported
transmission using polarization diversity in coherent optical OFDM
systems," Opt. Exp. 15, 9936-9947 (2007).

A. J. Lowery, "Fiber nonlinearity pre- and post-compensation for
long-haul optical links using OFDM," Opt. Exp. 15, 12965-12970 (2007).

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

E. Ip, J. M. Kahn, "Digital equalization of chromatic dispersion and
polarization mode dispersion," J. Lightw. Technol. 25, 2033-2043 (2007).

E. Inuzuka, E. Yamazaki, K. Yonenaga, A. Takada, "Performance of nonlinear interchannel crosstalk
pre-compensation at zero-dispersion wavelength using carrier
phase-locked WDM," Electron. Lett. 43, 729-730 (2007).

E. Ip, J. M. Kahn, "Power spectra of return-to-zero optical signals," J. Lightw. Technol. 24, 1610-1618 (2006).

S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent demodulation of optical multilevel
phase-shift-keying signals using homodyne detection and digital
signal processing," IEEE Photon. Technol. Lett. 18, 1131-1133 (2006).

A. Tarighat, R. C. J. Hsu, A. H. Sayed, B. Jalali, "Digital adaptive phase noise reduction in coherent
optical links," J. Lightw. Technol. 24, 1269-1276 (2006).

K. Roberts, C. Li, L. Strawczynski, M. O'Sullivan, I. Hardcastle, "Electronic precompensation of optical nonlinearity," IEEE Photon. Technol. Lett. 18, 403-405 (2006).

R.-J. Essiambre, P. J. Winzer, X. Q. Qang, W. Lee, C. A. White, E. C. Burrows, "Electronic predistortion and fiber nonlinearity," IEEE Photon. Technol. Lett. 18, 1804-1806 (2006).

E. Ip, J. M. Kahn, "Carrier synchronization for 3- and 4-bit-per-symbol
optical transmission," J. Lightw. Technol. 23, 4110-4124 (2005).

S. Wu, Y. Bar-Ness, "OFDM systems in the presence of phase noise:
Consequences and solutions," IEEE Trans. Commun. 52, 1988-1996 (2004).

M. G. Taylor, "Coherent detection method using DSP for demodulation
of signal and subsequent equalization of propagation impairments," IEEE Photon. Technol. Lett. 16, 674-676 (2004).

Y. Chen, T. Le-Ngoc, B. Champagne, C. Xu, "Recursive least squares constant modulus algorithm for
blind adaptive array," IEEE Trans. Signal Process. 52, 1452-1456 (2004).

K.-P. Ho, J. M. Kahn, "Electronic compensation technique to mitigate
nonlinear phase noise," J. Lightw. Technol. 22, 779-783 (2004).

A. Chowdhury, R.-J. Essiambre, "Optical phase conjugation and pseudolinear
transmission," Opt. Lett. 29, 1105-1107 (2004).

J. M. Kahn, K.-P. Ho, "Spectral efficiency limits and modulation/detection
techniques for DWDM systems," IEEE J. Sel. Topics Quantum Electron. 10, 259-272 (2004).

J. H. Lee, M. S. Kim, Y. C. Chung, "Statistical PMD emulator using variable DGD elements," IEEE Photon Technol. Lett. 15, 54-56 (2003).

O. V. Sinkin, R. Holzlöhner, J. Zweck, C. Menyuk, "Optimization of the split-step Fourier method in
modeling optical-fiber communication systems," J. Lightw. Technol. 21, 61-68 (2003).

J. Yang, J.-J. Werner, G. A. Dumont, "The multimodulus blind equalization and its
generalized algorithms," IEEE J. Sel. Areas Commun. 20, 997-1015 (2002).

P. P. Mitra, J. B. Stark, "Nonlinear limits to the information capacity of
optical fiber communications," Nature 411, 1027-1030 (2001).

P. P. Mitra, J. B. Stark, "Nonlinear limits to the information capacity of
optical fiber communications," Nature 411, 1027-1030 (2001).

J. P. Gordon, H. Kogelnik, "PMD fundamentals: Polarization mode dispersion in
optical fibers," Proc. Nat. Acad. Sci. 97, 4541-4550 (2000).

J. J. Shynk, "Frequency-domain multirate adaptive filtering," IEEE Signal Process. Mag. 9, 14-37 (1992).

J. R. Barry, J. M. Kahn, "Carrier synchronization for homodyne and heterodyne
detection of optical quadriphase-shift keying," J. Lightw. Technol. 10, 1939-1951 (1992).

S. Norimatsu, K. Iwashita, "Linewidth requirements for optical synchronous
detection systems with nonnegligible loop delay time," J. Lightw. Technol. 10, 341-349 (1992).

S. G. Evangelides, L. F. Mollenauer, J. P. Gordon, N. S. Bergano, "Polarization multiplexing with solitons," J. Lightw. Technol. 10, 28-35 (1992).

J. M. Kahn, A. M. Porter, U. Padan, "Heterodyne detection of 310-Mb/s quadriphase-shift
keying using fourth-power optical phase-locked loop," IEEE Photon. Technol. Lett. 4, 1397-1399 (1992).

J. M. Kahn, A. H. Gnauck, J. J. Veselka, S. K. Korotky, B. L. Kasper, "4-Gb/s PSK homodyne transmission system using
phase-locked semiconductor lasers," IEEE Photon. Technol. Lett. 2, 285-287 (1990).

J. S. Soo, K. K. Pang, "Multidelay block frequency domain adaptive filter," IEEE Trans. Acoust. Speech Signal Process. 38, 373-376 (1990).

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

S. U. H. Qureshi, "Adaptive equalization," Proc. IEEE 73, 1349-1387 (1985).

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

D. Mansour, A. H. Gray, "Unconstrained frequency-domain adaptive filter," IEEE Trans. Acoust. Speech Signal Process. ASSP-30, 726-734 (1982).

R. D. Gitlin, S. B. Weinstein, "Fractionally spaced equalization: An improved digital
transversal equalizer," Bell Syst. Tech. J. 60, 275-296 (1981).

D. N. Godard, "Self-recovering equalization and carrier tracking in
two-dimensional data communication systems," IEEE Trans. Commun. COM-28, 1867-1875 (1980).

R. D. Gitlin, S. B. Weinstein, "Fractionally spaced equalization: An improved digital
transversal equalizer," Bell Syst. Tech. J. 60, 275-296 (1981).

E. Inuzuka, E. Yamazaki, K. Yonenaga, A. Takada, "Performance of nonlinear interchannel crosstalk
pre-compensation at zero-dispersion wavelength using carrier
phase-locked WDM," Electron. Lett. 43, 729-730 (2007).

J. Yang, J.-J. Werner, G. A. Dumont, "The multimodulus blind equalization and its
generalized algorithms," IEEE J. Sel. Areas Commun. 20, 997-1015 (2002).

J. M. Kahn, K.-P. Ho, "Spectral efficiency limits and modulation/detection
techniques for DWDM systems," IEEE J. Sel. Topics Quantum Electron. 10, 259-272 (2004).

J. H. Lee, M. S. Kim, Y. C. Chung, "Statistical PMD emulator using variable DGD elements," IEEE Photon Technol. Lett. 15, 54-56 (2003).

J. M. Kahn, A. H. Gnauck, J. J. Veselka, S. K. Korotky, B. L. Kasper, "4-Gb/s PSK homodyne transmission system using
phase-locked semiconductor lasers," IEEE Photon. Technol. Lett. 2, 285-287 (1990).

J. M. Kahn, A. M. Porter, U. Padan, "Heterodyne detection of 310-Mb/s quadriphase-shift
keying using fourth-power optical phase-locked loop," IEEE Photon. Technol. Lett. 4, 1397-1399 (1992).

S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent demodulation of optical multilevel
phase-shift-keying signals using homodyne detection and digital
signal processing," IEEE Photon. Technol. Lett. 18, 1131-1133 (2006).

M. G. Taylor, "Coherent detection method using DSP for demodulation
of signal and subsequent equalization of propagation impairments," IEEE Photon. Technol. Lett. 16, 674-676 (2004).

K. Roberts, C. Li, L. Strawczynski, M. O'Sullivan, I. Hardcastle, "Electronic precompensation of optical nonlinearity," IEEE Photon. Technol. Lett. 18, 403-405 (2006).

R.-J. Essiambre, P. J. Winzer, X. Q. Qang, W. Lee, C. A. White, E. C. Burrows, "Electronic predistortion and fiber nonlinearity," IEEE Photon. Technol. Lett. 18, 1804-1806 (2006).

A. J. Lowery, "Fiber nonlinearity mitigation in optical links that
use OFDM for dispersion compensation," IEEE Photon. Technol. Lett. 19, 1556-1558 (2007).

J. J. Shynk, "Frequency-domain multirate adaptive filtering," IEEE Signal Process. Mag. 9, 14-37 (1992).

D. Mansour, A. H. Gray, "Unconstrained frequency-domain adaptive filter," IEEE Trans. Acoust. Speech Signal Process. ASSP-30, 726-734 (1982).

J. S. Soo, K. K. Pang, "Multidelay block frequency domain adaptive filter," IEEE Trans. Acoust. Speech Signal Process. 38, 373-376 (1990).

D. N. Godard, "Self-recovering equalization and carrier tracking in
two-dimensional data communication systems," IEEE Trans. Commun. COM-28, 1867-1875 (1980).

S. Wu, Y. Bar-Ness, "OFDM systems in the presence of phase noise:
Consequences and solutions," IEEE Trans. Commun. 52, 1988-1996 (2004).

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

Y. Chen, T. Le-Ngoc, B. Champagne, C. Xu, "Recursive least squares constant modulus algorithm for
blind adaptive array," IEEE Trans. Signal Process. 52, 1452-1456 (2004).

A. Tarighat, R. C. J. Hsu, A. H. Sayed, B. Jalali, "Digital adaptive phase noise reduction in coherent
optical links," J. Lightw. Technol. 24, 1269-1276 (2006).

I. Fatadin, D. Ives, S. Savory, "Blind equalization and carrier phase recovery in
16-QAM optical coherent system," J. Lightw. Technol. .

K.-P. Ho, J. M. Kahn, "Electronic compensation technique to mitigate
nonlinear phase noise," J. Lightw. Technol. 22, 779-783 (2004).

E. Ip, J. M. Kahn, "Compensation of dispersion and nonlinear impairments
using digital backpropagation," J. Lightw. Technol. 26, 3416-3425 (2008).

O. V. Sinkin, R. Holzlöhner, J. Zweck, C. Menyuk, "Optimization of the split-step Fourier method in
modeling optical-fiber communication systems," J. Lightw. Technol. 21, 61-68 (2003).

Q. Zhang, M. I. Hayee, "Symmetrized split-step Fourier scheme to control
global simulation accuracy in fiber-optic communication systems," J. Lightw. Technol. 26, 302-316 (2008).

J. R. Barry, J. M. Kahn, "Carrier synchronization for homodyne and heterodyne
detection of optical quadriphase-shift keying," J. Lightw. Technol. 10, 1939-1951 (1992).

S. Norimatsu, K. Iwashita, "Linewidth requirements for optical synchronous
detection systems with nonnegligible loop delay time," J. Lightw. Technol. 10, 341-349 (1992).

E. Ip, J. M. Kahn, "Carrier synchronization for 3- and 4-bit-per-symbol
optical transmission," J. Lightw. Technol. 23, 4110-4124 (2005).

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

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

D. J. F. Barros, J. M. Kahn, "Optimized dispersion compensation using orthogonal
frequency-division multiplexing," J. Lightw. Technol. 26, 2889-2898 (2008).

E. Ip, J. M. Kahn, "Digital equalization of chromatic dispersion and
polarization mode dispersion," J. Lightw. Technol. 25, 2033-2043 (2007).

E. Ip, J. M. Kahn, "Power spectra of return-to-zero optical signals," J. Lightw. Technol. 24, 1610-1618 (2006).

S. G. Evangelides, L. F. Mollenauer, J. P. Gordon, N. S. Bergano, "Polarization multiplexing with solitons," J. Lightw. Technol. 10, 28-35 (1992).

P. P. Mitra, J. B. Stark, "Nonlinear limits to the information capacity of
optical fiber communications," Nature 411, 1027-1030 (2001).

P. P. Mitra, J. B. Stark, "Nonlinear limits to the information capacity of
optical fiber communications," Nature 411, 1027-1030 (2001).

W. Shieh, K.-P. Ho, "Equalization-enhanced phase noise for
coherent-detection systems using electronic digital signal
processing," Opt. Exp. 16, 15718-15727 (2008).

G. Goldfarb, G. Li, "Efficient backward-propagation using wavelet-based
filtering for fiber backward-propagation," Opt. Exp. 17, 8815-8821 (2009).

W. Shieh, X. Yi, Y. Ma, Y. Tang, "Theoretical and experimental study on PMD-supported
transmission using polarization diversity in coherent optical OFDM
systems," Opt. Exp. 15, 9936-9947 (2007).

A. J. Lowery, "Fiber nonlinearity pre- and post-compensation for
long-haul optical links using OFDM," Opt. Exp. 15, 12965-12970 (2007).

E. Mateo, L. Zhu, G. Li, "Impact of XPM and FWM on the digital implementation of
impairment compensation for WDM transmission using backward
propagation," Opt. Exp. 16, 16124-16137 (2008).

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

E. Ip, A. P. T. Lau, D. J. F. Barros, J. M. Kahn, "Coherent detection in optical fiber systems," Opt. Exp. 16, 753-791 (2008).

S. J. Savory, "Digital filters for coherent optical receivers," Opt. Exp. 16, 804-817 (2008).

S. U. H. Qureshi, "Adaptive equalization," Proc. IEEE 73, 1349-1387 (1985).

J. P. Gordon, H. Kogelnik, "PMD fundamentals: Polarization mode dispersion in
optical fibers," Proc. Nat. Acad. Sci. 97, 4541-4550 (2000).

T. M. Cover, J. A. Thomas, Elements of Information Theory (Wiley, 1991).

B. Widrow, S. D. Stearn, Adaptive Signal Processing (Prentice-Hall, 1985).

A. Leven, N. Kaneda, Y.-K. Chen, "A real-time CMA-based 10 Gb/s polarization
demultiplexing coherent receiver implemented in an FPGA," pt. Fiber Commun. Conf. San DiegoCA (2008) paper OTuO2.

A. V. Oppenheim, R. W. Schafer, Discrete-Time Signal Processing .

S. Haykin, Adaptive Filter Theory (Prentice-Hall, 2002).

S. J. Savory, G. Gavioli, R. I. Killey, P. Bayvel, "Transmission of 42.8 Gbit/s polarization multiplexed
NRZ-QPSK over 6400 km of standard fiber with no optical dispersion
compensation," Opt. Fiber Commun. Conf. AnaheimCA (2007) paper OTuA1.

G. Charlet, M. Salsi, P. Tran, M. Bertolini, H. Mardoyan, J. Renaudier, O. Bertran-Pardo, S. Bigo, "72 $\times$ 100 Gb/s transmission over transoceanic distance,
using large effective area fiber, hybrid Raman-Erbium amplification
and coherent detection," Opt. Fiber Commun. Conf. San DiegoCA (2009) paper PDPB6.

S. Haykin, Neural Networks: A Comprehensive Foundation (Prentice-Hall, 1998).

M. Kuschnerov, F. N. Hauske, K. Piyawanno, B. Spinnler, A. Napoli, B. Lankl, "Adaptive chromatic dispersion equalization for
non-dispersion managed coherent systems," Opt. Fiber Commun. Conf. San DiegoCA (2009) paper OMT1.

S. Abrar, "Compact constellation algorithm for blind equalization
of QAM signals," Proc. Int. Netw. Commun. Conf. (2004) pp. 170-174.

C. Xie, "Local oscillator phase noise induced penalties in
optical coherent detection systems using electronic chromatic
dispersion compensation," Opt. Fiber Commun. Conf. San DiegoCA (2009) paper OMT4.

K. Kikuchi, M. Fukase, S. Kim, "Electronic post-compensation for nonlinear phase noise
in a 1000-km 20-Gb/s optical QPSK transmission system using the
homodyne receiver with digital signal processing," Opt. Fiber Commun. Conf. Los AngelesCA (2007) paper OTuA2.

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," Eur. Conf. Optical Commun. CannesFrance (2006) paper Th4.3.4.

R.-J. Essiambre, G. J. Foschini, P. J. Winzer, G. Kramer, E. C. Burrows, "The capacity of fiber-optic communication systems," Opt. Fiber Commun. Conf. San DiegoCA (2009) paper OTuE17.

R.-J. Essiambre, G. J. Foschini, P. J. Winzer, G. Kramer, "Exploring capacity limits of fibre-optic communication
systems," Eur. Conf. Opt. Commun. BrusselsBelgium (2006) paper We1.E.1.

R.-J. Essiambre, G. J. Foschini, P. J. Winzer, G. Kramer, E. C. Burrows, "The capacity of fiber-optic communication systems," Opt. Fiber Commun. Conf. San DiegoCA (2008) paper OTuE1.

G. P. Agrawal, Fiber-Optic Communication Systems (Wiley, 2002).

G. P. Agrawal, Nonlinear Fiber Optics (Academic, 2001).

X. Liu, R. W. Tkach, "Joint SPM compensation for
inline-dispersion-compensated 112-Gb/s PDM-OFDM transmission," Opt. Fiber Commun. Conf. San DiegoCA (2009) paper OTuO5.