Abstract

An enhanced digital coherent receiver including a novel blind equalization approach and maximum-likelihood sequence detection (MLSD) is proposed for dual-polarization quadrature duobinary (DP-QDB) systems. In virtue of the compact spectrum of DP-QDB signals approaching Nyquist limit, the equalization is implemented at symbol rate, which relaxes the demand on the sampling speed of analog-to-digital converters (ADCs). The proposed symbol-rate receiver is verified by 43Gb/s experiments in the presence of chromatic dispersion and polarization-mode dispersion. This paper also investigates the tolerances to narrowband optical filtering, ADC sampling phase, duobinary-generating filter bandwidth, laser linewidth, and carrier frequency offset. Detailed modulation format comparisons are made among DP-QDB, DP-quadrature-phase-shift keying (QPSK), DP-8 quadrature amplitude modulation (QAM), and DP-16QAM. It is shown that DP-QDB with MLSD well trades off major requirements on advanced modulation formats.

© 2011 IEEE

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2010

P. J. Winzer, A. H. Gnauck, C. R. Doerr, M. Magarini, L. L. Buhl, "Spectrally efficient long-haul optical networking using 112-Gb/s polarization-multiplexed 16-QAM," J. Lightw. Technol. 28, 547-556 (2010).

X. Zhou, J. Yu, M.-F. Huang, Y. Shao, T. Wang, P. Magill, M. Cvijetic, L. Nelson, M. Birk, G. Zhang, S. Ten, "Transmission of 32-Tb/s capacity over 580 km using RZ-shaped PDM-8QAM modulation format and cascaded multimodulus blind equalization algorithm," J. Lightw. Technol. 28, 456-465 (2010).

I. Lyubomirsky, "Quadrature duobinary for high-spectral efficiency 100G transmission," J. Lightw. Technol. 28, 91-96 (2010).

F. Machi, M. S. Alfiad, M. Kuschnerov, T. Wuth, D. van den Borne, N. Hanik, H. de Waardt, "111-Gb/s PolMux-quadrature duobinary for robust and bandwidth efficient transmission," IEEE Photon. Technol. Lett. 22, 751-753 (2010).

2009

2008

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

I. Fatadin, S. J. Savory, D. Ives, "Compensation of quadrature imbalance in an optical QPSK coherent receiver," IEEE Photon. Technol. Lett. 20, 1733-1735 (2008).

2006

P. J. Winzer, R.-J. Essiambre, "Advanced optical modulation formats," Proc. IEEE 94, 952-985 (2006).

2005

I. Lyubomirsky, C.-C. Chien, "Tailoring the duobinary pulse shape for optimum performance," J. Lightw. Technol. 23, 3732-3736 (2005).

2000

G. H. Lee, R.-H. Park, "Shell partition-based joint blind equalization for QAM systems," IEEE Trans. Consum. Electron. 46, 295-305 (2000).

1997

J. K. Tugnait, U. Gummadavelli, "Blind equalization and channel estimation with partial response input signals," IEEE Trans. Commun. 45, 1025-1031 (1997).

1990

O. Shalvi, E. Weinstein, "New criteria for blind deconvolution of nonminimum phase systems (channels)," IEEE Trans. Inf. Theory 36, 312-321 (1990).

1985

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

1983

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).

1973

G. D. Forney, Jr."The Viterbi algorithm," Proc. IEEE 61, 268-278 (1973).

1972

G. D. Forney, Jr."Maximum likelihood sequence estimation of digital sequences in the presence of intersymbol interference," IEEE Trans. Inf. Theory 18, 363-378 (1972).

1971

H. Kobayashi, "Correlative level coding and maximum likelihood decoding," IEEE Trans. Inf. Theory IT-17, 586-594 (1971).

Adv. Opt. Photon.

IEEE Trans. Commun.

J. K. Tugnait, U. Gummadavelli, "Blind equalization and channel estimation with partial response input signals," IEEE Trans. Commun. 45, 1025-1031 (1997).

IEEE Trans. Inf. Theory

O. Shalvi, E. Weinstein, "New criteria for blind deconvolution of nonminimum phase systems (channels)," IEEE Trans. Inf. Theory 36, 312-321 (1990).

IEEE Photon. Technol. Lett.

I. Fatadin, S. J. Savory, D. Ives, "Compensation of quadrature imbalance in an optical QPSK coherent receiver," IEEE Photon. Technol. Lett. 20, 1733-1735 (2008).

IEEE Photon. Technol. Lett.

F. Machi, M. S. Alfiad, M. Kuschnerov, T. Wuth, D. van den Borne, N. Hanik, H. de Waardt, "111-Gb/s PolMux-quadrature duobinary for robust and bandwidth efficient transmission," IEEE Photon. Technol. Lett. 22, 751-753 (2010).

IEEE Trans. Consum. Electron.

G. H. Lee, R.-H. Park, "Shell partition-based joint blind equalization for QAM systems," IEEE Trans. Consum. Electron. 46, 295-305 (2000).

IEEE Trans. Inf. Theory

H. Kobayashi, "Correlative level coding and maximum likelihood decoding," IEEE Trans. Inf. Theory IT-17, 586-594 (1971).

IEEE Trans. Inf. Theory

G. D. Forney, Jr."Maximum likelihood sequence estimation of digital sequences in the presence of intersymbol interference," IEEE Trans. Inf. Theory 18, 363-378 (1972).

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).

J. Lightw. Technol.

I. Lyubomirsky, C.-C. Chien, "Tailoring the duobinary pulse shape for optimum performance," J. Lightw. Technol. 23, 3732-3736 (2005).

I. Lyubomirsky, "Quadrature duobinary for high-spectral efficiency 100G transmission," J. Lightw. Technol. 28, 91-96 (2010).

P. J. Winzer, A. H. Gnauck, C. R. Doerr, M. Magarini, L. L. Buhl, "Spectrally efficient long-haul optical networking using 112-Gb/s polarization-multiplexed 16-QAM," J. Lightw. Technol. 28, 547-556 (2010).

X. Zhou, J. Yu, M.-F. Huang, Y. Shao, T. Wang, P. Magill, M. Cvijetic, L. Nelson, M. Birk, G. Zhang, S. Ten, "Transmission of 32-Tb/s capacity over 580 km using RZ-shaped PDM-8QAM modulation format and cascaded multimodulus blind equalization algorithm," J. Lightw. Technol. 28, 456-465 (2010).

Opt. Exp.

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

Proc. IEEE

P. J. Winzer, R.-J. Essiambre, "Advanced optical modulation formats," Proc. IEEE 94, 952-985 (2006).

G. D. Forney, Jr."The Viterbi algorithm," Proc. IEEE 61, 268-278 (1973).

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

Other

L. Li, Z. Tao, S. Oda, T. Hoshida, J. C. Rasmussen, "Wide-range, accurate and simple digital frequency offset compensator for optical coherent receivers," Conf. Optical Fiber Communication/National Fiber Optic Engineers presented inSan DiegoCA (2008) Paper OWT4.

J. Li, Z. Tao, H. Zhang, W. Yan, T. Hoshida, J. C. Rasmussen, "Enhanced digital coherent receiver for high spectral-efficiency dual-polarization quadrature duobinary systems," Eur. Conf. Exhib. Optical Communication presented inTurinItaly (2010) ECOC 2010 Paper Th.10.A.3.

K. Kikuchi, Y. Ishikawa, K. Katoh, "Coherent demodulation of optical quadrature duobinary signal with spectral efficiency of 4 bit/s/Hz per polarization," Eur. Conf. Exhib. Optical Communication BerlinGermany (2007) Paper 9.3.4.

I. Lyubomirsky, "Quadrature duobinary modulation for 100G transmission beyond the Nyquist limit," Optical Fiber Communication presented inSan DiegoCA (2010) OFC2010 Paper OThM4.

J. G. Proakis, Digital Communications (McGraw-Hill, 2001).

T. Katoh, Partial Response Quadrature Amplitude Modulation System U.S. Patent no. 4055727 (1977).

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