Abstract

We experimentally demonstrate 8 × 240-Gb/s super-Nyquist wavelength-division-multiplexing (WDM) polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal transmission on a 50-GHz grid with a net spectral efficiency (SE) of 4b/s/Hz adopting hardware-efficient simplified heterodyne detection. 9-ary quadrature-amplitude-modulation-like (9QAM-like) processing based on multi-modulus blind equalization (MMBE) is adopted to reduce analog-to-digital converter (ADC) bandwidth requirement and improve receiver sensitivity. The transmission distance at the soft-decision forward-error-correction (SD-FEC) threshold of 2 × 10−2 is 2 × 420km based on digital post filtering while largely extended to over 5 × 420km based on 9QAM-like processing, which well illustrates 9QAM-like processing is more efficient for heterodyne coherent WDM system. Moreover, only two ADC channels are needed for simplified heterodyne detection of one 60-Gbaud PDM-QPSK WDM channel, and thus only one commercial oscilloscope (OSC) with two input ports can work well for each WDM channel.

© 2014 Optical Society of America

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References

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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref]
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    [Crossref]
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    [Crossref]
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2014 (1)

2013 (4)

2012 (2)

2010 (1)

2009 (1)

2008 (1)

Barros, D. J. F.

Buhl, L. L.

Chi, N.

Chien, H. C.

Doerr, C. R.

Dong, Z.

Gnauck, A. H.

Gunkel, M.

Huang, B.

J. Zhang, B. Huang, and X. Li, “Improved quadrature duobinary system performance using multi-modulus equalization,” IEEE Photon. Technol. Lett. 25(16), 1630–1633 (2013).
[Crossref]

Huo, D.

Igarashi, K.

Imamura, K.

Ip, E.

Jia, Z.

Kahn, J. M.

Lau, A. P. T.

Li, X.

Maeda, K.

Magarini, M.

Mayer, H.

Morita, I.

Saito, T.

Schippel, A.

Shao, Y.

Sugizaki, R.

Suzuki, M.

Tadakuma, M.

Tao, L.

Tsuchida, Y.

Tsuritani, T.

Wagner, P.

Watanabe, K.

Winzer, P. J.

Yu, J.

J. Yu, Z. Dong, H. C. Chien, Z. Jia, X. Li, D. Huo, M. Gunkel, P. Wagner, H. Mayer, and A. Schippel, “Transmission of 200 G PDM-CSRZ-QPSK and PDM-16 QAM with a SE of 4 b/s/Hz,” J. Lightwave Technol. 31(4), 515–522 (2013).
[Crossref]

X. Li, Z. Dong, J. Yu, J. Yu, and N. Chi, “Heterodyne coherent detection of WDM PDM-QPSK signals with spectral efficiency of 4b/s/Hz,” Opt. Express 21(7), 8808–8814 (2013).
[Crossref] [PubMed]

X. Li, Z. Dong, J. Yu, J. Yu, and N. Chi, “Heterodyne coherent detection of WDM PDM-QPSK signals with spectral efficiency of 4b/s/Hz,” Opt. Express 21(7), 8808–8814 (2013).
[Crossref] [PubMed]

J. Zhang, J. Yu, N. Chi, Z. Dong, J. Yu, X. Li, L. Tao, and Y. Shao, “Multi-modulus blind equalizations for coherent quadrature duobinary spectrum shaped PM-QPSK digital signal processing,” J. Lightwave Technol. 31(7), 1073–1078 (2013).
[Crossref]

J. Zhang, J. Yu, N. Chi, Z. Dong, J. Yu, X. Li, L. Tao, and Y. Shao, “Multi-modulus blind equalizations for coherent quadrature duobinary spectrum shaped PM-QPSK digital signal processing,” J. Lightwave Technol. 31(7), 1073–1078 (2013).
[Crossref]

X. Li, J. Yu, N. Chi, Z. Dong, J. Zhang, and J. Yu, “The reduction of the LO number for heterodyne coherent detection,” Opt. Express 20(28), 29613–29619 (2012).
[Crossref] [PubMed]

X. Li, J. Yu, N. Chi, Z. Dong, J. Zhang, and J. Yu, “The reduction of the LO number for heterodyne coherent detection,” Opt. Express 20(28), 29613–29619 (2012).
[Crossref] [PubMed]

J. Zhang, Z. Dong, J. Yu, N. Chi, L. Tao, X. Li, and Y. Shao, “Simplified coherent receiver with heterodyne detection of eight-channel 50 Gb/s PDM-QPSK WDM signal after 1040 km SMF-28 transmission,” Opt. Lett. 37(19), 4050–4052 (2012).
[Crossref] [PubMed]

X. Zhou and J. Yu, “Multi-level, multi-dimensional coding for high-speed and high spectral-efficiency optical transmission,” J. Lightwave Technol. 27(16), 3641–3653 (2009).
[Crossref]

Zhang, J.

Zhou, X.

IEEE Photon. Technol. Lett. (1)

J. Zhang, B. Huang, and X. Li, “Improved quadrature duobinary system performance using multi-modulus equalization,” IEEE Photon. Technol. Lett. 25(16), 1630–1633 (2013).
[Crossref]

J. Lightwave Technol. (4)

Opt. Express (4)

Opt. Lett. (1)

Other (7)

T. Mizuochi, Y. Miyata, K. Kubo, T. Sugihara, K. Onohara, and H. Yoshida, “Progress in soft-decision FEC,” in Proc. OFC/NFOEC2011, Los Angeles, CA, paper NWC2.
[Crossref]

X. Zhou, J. Yu, and P. D. Magill, “Cascaded two-modulus algorithm for blind polarization de-multiplexing of 114-Gb/s PDM-8-QAM optical signals,” in Proc. OFC/NFOEC2009, San Diego, CA, Paper OWG3.

S. Zhang, M. F. Huang, F. Yaman, E. Mateo, D. Qian, Y. Zhang, L. Xu, Y. Shao, I. Djordjevic, T. Wang, Y. Inada, T. Inoue, T. Ogata, and Y. Aoki, “40×117.6 Gb/s PDM-16QAM OFDM transmission over 10,181 km with soft-decision LDPC coding and nonlinearity compensation,” in Proc. OFC/NFOEC2012, Los Angeles, CA, paper PDP5C.4.

R. Zhu, K. Xu, Y. Zhang, Y. Li, J. Wu, X. Hong, and J. Lin, “QAM coherent subcarrier multiplexing system based on heterodyne detection using intermediate frequency carrier modulation,” in Proc. Of APMP, 165–168 (2008).

X. Li, J. Zhang, F. Li, and J. Xiao, “Over 2000-km transmission of 60-Gbaud PDM-QPSK signal with heterodyne detection and SE of 4b/s/Hz,” in Proc. OFC/NFOEC 2014, San Francisco, CA, paper Th4F.4.
[Crossref]

J. Li, E. Tipsuwannakul, M. Karlsson, and P. A. Andrekson, “Low complexity duobinary signaling and detection for sensitivity improvement in Nyquist-WDM coherent system,” in Proc. OFC/NFOEC2012, Los Angeles, CA, paper OM3H.2.
[Crossref]

ITU-T Recommendation G.975.1, “Forward error correction for high bit-rate DWDM submarine system,” 2004.

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Figures (6)

Fig. 1
Fig. 1 Principle of super-Nyquist spectral shaping for single-polarization QPSK signal.
Fig. 2
Fig. 2 Experimental setup for heterodyne coherent WDM transmission.
Fig. 3
Fig. 3 Optical spectra: (a) before and (b) after 5 × 420-km SMF-28 transmission. (c) Optical spectrum selected by WSS. (d) Electrical spectrum after analog-to-digital conversion.
Fig. 4
Fig. 4 (a) BTB optical spectra. (b) BTB BER versus OSNR.
Fig. 5
Fig. 5 (a) BTB BER versus OSNR. (b) BTB BER versus OSNR for single and WDM channels. Insets (I) and (II) give X- and Y-polarization 9QAM-like constellations.
Fig. 6
Fig. 6 (a) BER versus transmission distance. (b) BER of all channels. Inset (I) gives X-polarization 9QAM-like constellation.

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