Abstract

We propose a joint digital preequalization scheme for a Nyquist wavelength division multiplexing (N-WDM) system to compensate for the intersymbol interference caused by a limited channel bandwidth or aggressive prefiltering. A digital raised-cosine pulse filter is implemented before the reference-based preequalization scheme to enhance the tolerance of the signal to the crosstalk from adjacent channels. The experiment illustrates eight-channel digital–analog-converter generation of the polarization division multiplexing quadrature phase shift keying system at 112 Gb/s per channel on a 25-GHz grid, adopting the reference-based digital preequalization considering narrow-band optical filtering effect at the transmitter. The experimental results show that the proposed preequalization scheme allows for an ultradense channel spacing of 0.89 times of the baud rate in the super N-WDM system with a as large as 5-dB optical signal-to-noise ratio improvement.

© 2013 IEEE

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  1. C. R. S. Fludger, T. Duthel, D. Borne, C. Schulien, E. Schmidt, T. Wuth, J. Geyer, E. Man, G. Khoe, H. Waardt, "Coherent equalization and POLMUX-RZ-DQPSK for robust 100-GE transmission," J. Lightw. Technol. 26, 64 -72 (2008).
  2. J. Yu, Z. Dong, X. Xiao, Y. Xia, S. Shi, C. Ge, W. Zhou, N. Chi, Y. Shao, "Generation, transmission and coherent detection of 11.2 Tb/s (112×100 Gb/s) single source optical OFDM superchannel," Proc. Opt. Fiber Commun. (2011) pp. 1-3.
  3. G. Bosco, A. Carena, V. Curri, P. Poggiolini, F. Forghieri, "Performance limits of N-WDM and CO-OFDM in high-speed PM-QPSK systems," IEEE Photon. Technol. Lett. 22, 1129 -1131 (2010).
  4. J. -X. Cai, Y. Cai, Y. Sun, C. R. Davidson, D. G. Foursa, A. Lucero, O. Sinkin, W. Patterson, A. Pilipetskii, G. Mohs, N. Bergano, " 112×112 Gb/s transmission over 9,360 km with channel spacing set to the baud rate (360% spectral efficiency)," Proc. 36th Euro. Conf. Exhib. Opt. Commun. (2010) pp. 1 -3, Paper PD2.1.
  5. J. Li, E. Tipsuwannakul, T. Eriksson, M. Karlsson, P. Andrekson, "Approaching Nyquist limit in wavelength-division multiplexing systems by low-complexity duobinary shaping and detection," J. Lightw. Technol. 30, 1664-1676 (2012).
  6. J. Wang, C. Xie, Z. Pan, "Generation of spectrally efficient Nyquist-WDM QPSK signals using digital FIR or FDE filters at transmitters," J. Lightw. Technol. 30, 3679-3686 (2012).
  7. Y. Jiang, X. Tang, J. Cartledge, K. Roberts, "Electronic pre-compensation of narrow optical filtering for OOK, DPSK and DQPSK modulation formats," J. Lightw. Technol. 27, 3689-3698 (2009).
  8. R. Cigliutti, A. Nespola, D. Zeolla, G. Bosco, A. Carena, V. Curri, F. Forghieri, Y. Yamamoto, T. Sasaki, P. Poggiolini, "16 × 125 Gb/s quasi-Nyquist DAC-generated PM-16QAM transmission over 3590 km of PSCF ," IEEE Photon. Technol. Lett. 24, 2143-2146 (2012).
  9. T. Sugihara, T. Kobayashi, Y. Konishi, S. Hirano, K. Tsutsumi, K. Yamagishi, T. Ichikawa, S. Inoue, K. Kubo, Y. Takahashi, K. Goto, T. Fujimori, K. Uto, T. Yoshida, K. Sawada, S. Kametani, H. Bessho, T. Inoue, K. Koguchi, K. Shimizu, T. Mizuochi, "43 Gb/s DQPSK pre-equalization employing 6-bit, 43 GS/s DAC integrated LSI for cascaded ROADM filtering," Proc. Opt. Fiber Commun. (2010 ) pp. 1-3, Paper PDPB6.
  10. Z Dong, X Li, J Yu, N Chi, "6× 128-Gb/s Nyquist-WDM PDM-16QAM generation and transmission over 1200-km SMF-28 with a SE of 7.47 b/s/Hz," J. Lightw. Technol. 30, 4000-4005 (2012).
  11. Z Dong, X Li, J Yu, N Chi, "6 × 144 Gb/s Nyquist-WDM PDM-64QAM generation and transmission on a 12-GHz WDM grid equipped with Nyquist-band pre-equalization," J. Lightw. Technol. 30, 3687-3692 ( 2012).
  12. X. Zhou, J. Yu, " Multi-level, multi-dimensional coding for high-speed and high-spectral-efficiency optical transmission ," J. Lightw. Technol. 27, 3641-3653 (2009).
  13. R. Schmogrow, M. Winter, M. Meyer, D. Hillerkuss, S. Wolf, B. Baeuerle, A. Ludwig, B. Nebendahl, S. Ben-Ezra, J. Meyer, M. Dreschmann, M. Huebner, J. Becker, C. Koos, W. Freude, J. Leuthold, "Real-time Nyquist pulse generation beyond 100 Gbit/s and its relation to OFDM," Opt. Exp. 20, 317-337 (2012).
  14. F. S. Faruk, K. Kikuchi, "Adaptive frequency-domain equalization in digital coherent optical receivers," Opt. Exp. 19, 12789-12798 (2012).

2012

J. Li, E. Tipsuwannakul, T. Eriksson, M. Karlsson, P. Andrekson, "Approaching Nyquist limit in wavelength-division multiplexing systems by low-complexity duobinary shaping and detection," J. Lightw. Technol. 30, 1664-1676 (2012).

J. Wang, C. Xie, Z. Pan, "Generation of spectrally efficient Nyquist-WDM QPSK signals using digital FIR or FDE filters at transmitters," J. Lightw. Technol. 30, 3679-3686 (2012).

R. Cigliutti, A. Nespola, D. Zeolla, G. Bosco, A. Carena, V. Curri, F. Forghieri, Y. Yamamoto, T. Sasaki, P. Poggiolini, "16 × 125 Gb/s quasi-Nyquist DAC-generated PM-16QAM transmission over 3590 km of PSCF ," IEEE Photon. Technol. Lett. 24, 2143-2146 (2012).

Z Dong, X Li, J Yu, N Chi, "6× 128-Gb/s Nyquist-WDM PDM-16QAM generation and transmission over 1200-km SMF-28 with a SE of 7.47 b/s/Hz," J. Lightw. Technol. 30, 4000-4005 (2012).

R. Schmogrow, M. Winter, M. Meyer, D. Hillerkuss, S. Wolf, B. Baeuerle, A. Ludwig, B. Nebendahl, S. Ben-Ezra, J. Meyer, M. Dreschmann, M. Huebner, J. Becker, C. Koos, W. Freude, J. Leuthold, "Real-time Nyquist pulse generation beyond 100 Gbit/s and its relation to OFDM," Opt. Exp. 20, 317-337 (2012).

F. S. Faruk, K. Kikuchi, "Adaptive frequency-domain equalization in digital coherent optical receivers," Opt. Exp. 19, 12789-12798 (2012).

2010

G. Bosco, A. Carena, V. Curri, P. Poggiolini, F. Forghieri, "Performance limits of N-WDM and CO-OFDM in high-speed PM-QPSK systems," IEEE Photon. Technol. Lett. 22, 1129 -1131 (2010).

2009

Y. Jiang, X. Tang, J. Cartledge, K. Roberts, "Electronic pre-compensation of narrow optical filtering for OOK, DPSK and DQPSK modulation formats," J. Lightw. Technol. 27, 3689-3698 (2009).

X. Zhou, J. Yu, " Multi-level, multi-dimensional coding for high-speed and high-spectral-efficiency optical transmission ," J. Lightw. Technol. 27, 3641-3653 (2009).

2008

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

IEEE Photon. Technol. Lett.

G. Bosco, A. Carena, V. Curri, P. Poggiolini, F. Forghieri, "Performance limits of N-WDM and CO-OFDM in high-speed PM-QPSK systems," IEEE Photon. Technol. Lett. 22, 1129 -1131 (2010).

IEEE Photon. Technol. Lett.

R. Cigliutti, A. Nespola, D. Zeolla, G. Bosco, A. Carena, V. Curri, F. Forghieri, Y. Yamamoto, T. Sasaki, P. Poggiolini, "16 × 125 Gb/s quasi-Nyquist DAC-generated PM-16QAM transmission over 3590 km of PSCF ," IEEE Photon. Technol. Lett. 24, 2143-2146 (2012).

J. Lightw. Technol.

J. Li, E. Tipsuwannakul, T. Eriksson, M. Karlsson, P. Andrekson, "Approaching Nyquist limit in wavelength-division multiplexing systems by low-complexity duobinary shaping and detection," J. Lightw. Technol. 30, 1664-1676 (2012).

J. Wang, C. Xie, Z. Pan, "Generation of spectrally efficient Nyquist-WDM QPSK signals using digital FIR or FDE filters at transmitters," J. Lightw. Technol. 30, 3679-3686 (2012).

Y. Jiang, X. Tang, J. Cartledge, K. Roberts, "Electronic pre-compensation of narrow optical filtering for OOK, DPSK and DQPSK modulation formats," J. Lightw. Technol. 27, 3689-3698 (2009).

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

Z Dong, X Li, J Yu, N Chi, "6× 128-Gb/s Nyquist-WDM PDM-16QAM generation and transmission over 1200-km SMF-28 with a SE of 7.47 b/s/Hz," J. Lightw. Technol. 30, 4000-4005 (2012).

Z Dong, X Li, J Yu, N Chi, "6 × 144 Gb/s Nyquist-WDM PDM-64QAM generation and transmission on a 12-GHz WDM grid equipped with Nyquist-band pre-equalization," J. Lightw. Technol. 30, 3687-3692 ( 2012).

X. Zhou, J. Yu, " Multi-level, multi-dimensional coding for high-speed and high-spectral-efficiency optical transmission ," J. Lightw. Technol. 27, 3641-3653 (2009).

Opt. Exp.

R. Schmogrow, M. Winter, M. Meyer, D. Hillerkuss, S. Wolf, B. Baeuerle, A. Ludwig, B. Nebendahl, S. Ben-Ezra, J. Meyer, M. Dreschmann, M. Huebner, J. Becker, C. Koos, W. Freude, J. Leuthold, "Real-time Nyquist pulse generation beyond 100 Gbit/s and its relation to OFDM," Opt. Exp. 20, 317-337 (2012).

F. S. Faruk, K. Kikuchi, "Adaptive frequency-domain equalization in digital coherent optical receivers," Opt. Exp. 19, 12789-12798 (2012).

Other

J. Yu, Z. Dong, X. Xiao, Y. Xia, S. Shi, C. Ge, W. Zhou, N. Chi, Y. Shao, "Generation, transmission and coherent detection of 11.2 Tb/s (112×100 Gb/s) single source optical OFDM superchannel," Proc. Opt. Fiber Commun. (2011) pp. 1-3.

J. -X. Cai, Y. Cai, Y. Sun, C. R. Davidson, D. G. Foursa, A. Lucero, O. Sinkin, W. Patterson, A. Pilipetskii, G. Mohs, N. Bergano, " 112×112 Gb/s transmission over 9,360 km with channel spacing set to the baud rate (360% spectral efficiency)," Proc. 36th Euro. Conf. Exhib. Opt. Commun. (2010) pp. 1 -3, Paper PD2.1.

T. Sugihara, T. Kobayashi, Y. Konishi, S. Hirano, K. Tsutsumi, K. Yamagishi, T. Ichikawa, S. Inoue, K. Kubo, Y. Takahashi, K. Goto, T. Fujimori, K. Uto, T. Yoshida, K. Sawada, S. Kametani, H. Bessho, T. Inoue, K. Koguchi, K. Shimizu, T. Mizuochi, "43 Gb/s DQPSK pre-equalization employing 6-bit, 43 GS/s DAC integrated LSI for cascaded ROADM filtering," Proc. Opt. Fiber Commun. (2010 ) pp. 1-3, Paper PDPB6.

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