Abstract

We demonstrate the use of digital coherent superposition to improve the performance of space-division-multiplexed (SDM) 676-Gb/s OFDM-16QAM superchannels, achieving ~4 dB improvement in OSNR by using two SDM copies and 1075-km (14x76.8km) transmission over a seven-core-fiber with an effective aggregate spectral efficiency of 23.7 b/s/Hz. We further show that the performance improvement from the coherent superposition is retained in the nonlinear transmission regime through coordinated scrambling of signal constellations at the transmitter and appropriate unscrambling at the receiver, by using a series of simple scrambling functions.

© 2012 OSA

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  1. J. Sakaguchi, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi, T. Hayashi, T. Taru, T. Kobayashi, M. Watanabe, “109-Tb/s (7x97x172-Gb/s) SDM/WDM/PDM) QPSK transmission through 16.8-km homogeneous multicore fiber,” OFC’11, PDPB6 (2011).
  2. B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s Space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express19(17), 16665–16671 (2011).
    [CrossRef] [PubMed]
  3. H. Takara, A. Sano, T. Kobayashi, H. Kubota, H. Kawakami, A. Matsuura, Y. Miyamoto, Y. Abe, H. Ono, K. Shikama, Y. Goto, K. Tsujikawa, Y. Sasaki, I. Ishida, K. Takenaga, S. Matsuo, K. Saitoh, M. Koshiba, and T. Morioka, “1.01-Pb/s (12 SDM/222 WDM/456 Gb/s) Crosstalk-managed transmission with 91.4-b/s/Hz aggregate spectral efficiency,” in Proceedings of the 2012 European Conference on Optical Communication (Amsterdam, Netherlands), paper Th.3.C.1 (2012).
  4. X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency,” Opt. Express19(26), B958–B964 (2011).
    [CrossRef] [PubMed]
  5. X. Liu, S. Chandrasekhar, A. H. Gnauck, P. J. Winzer, A. R. Chraplyvy, B. Zhu, T. Taunay, and M. Fishteyn, “Performance improvement of space-division multiplexed 128-Gb/s PDM-QPSK signals by constructive superposition in a single-input-multiple-output configuration,” in Proceedings of the 2012 Optical Fiber Communication Conference (Optical Society of America, Washington, DC, 2012), OTu1D3.
  6. X. Liu, S. Chandrasekhar, P. J. Winzer, A. R. Chraplyvy, R. W. Tkach, B. Zhu, T. F. Taunay, M. Fishteyn, and D. J. Digiovanni, “Scrambled coherent superposition for enhanced optical fiber communication in the nonlinear transmission regime,” Opt. Express20(17), 19088–19095 (2012).
    [CrossRef] [PubMed]
  7. X. Liu, S. Chandrasekhar, A. H. Gnauck, P. J. Winzer, S. Randel, S. Corteselli, B. Zhu, T. Taunay, and M. Fishteyn, “Digital coherent superposition for performance improvement of spatially multiplexed 676-Gb/s OFDM-16QAM superchannels,” in Proceedings of the 2012 European Conference on Optical Communication (Amsterdam, Netherlands), paper Tu.3.C.2 (2012).
  8. S. Chandrasekhar, A. H. Gnauck, X. Liu, P. J. Winzer, Y. Pan, E. C. Burrows, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “WDM/SDM transmission of 10 x 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 km·b/s/Hz,” Opt. Express20(2), 706–711 (2012).
    [CrossRef] [PubMed]
  9. X. Liu, S. Chandrasekhar, B. Zhu, P. Winzer, A. Gnauck, and D. Peckham, “448-Gb/s reduced-guard-interval CO-OFDM transmission over 2000 km of ultra-large-area fiber and five 80-GHz-grid ROADMs,” J. Lightwave Technol.29(4), 483–490 (2011).
    [CrossRef]
  10. F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag.48(3), S48–S55 (2010).
    [CrossRef]
  11. Y. Miyata, K. Sugihara, W. Matsumoto, K. Onohara, T. Sugihara, K. Kubo, H. Yoshida, and T. Mizuochi, “A triple-concatenated FEC using soft-decision decoding for 100 Gb/s optical transmission,” in Optical Fiber Communication conference and National Fiber Optic Engineers Conference2010, paper OThL3.

2012

2011

2010

F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag.48(3), S48–S55 (2010).
[CrossRef]

Burrows, E. C.

Chandrasekhar, S.

X. Liu, S. Chandrasekhar, P. J. Winzer, A. R. Chraplyvy, R. W. Tkach, B. Zhu, T. F. Taunay, M. Fishteyn, and D. J. Digiovanni, “Scrambled coherent superposition for enhanced optical fiber communication in the nonlinear transmission regime,” Opt. Express20(17), 19088–19095 (2012).
[CrossRef] [PubMed]

S. Chandrasekhar, A. H. Gnauck, X. Liu, P. J. Winzer, Y. Pan, E. C. Burrows, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “WDM/SDM transmission of 10 x 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 km·b/s/Hz,” Opt. Express20(2), 706–711 (2012).
[CrossRef] [PubMed]

B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s Space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express19(17), 16665–16671 (2011).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency,” Opt. Express19(26), B958–B964 (2011).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, B. Zhu, P. Winzer, A. Gnauck, and D. Peckham, “448-Gb/s reduced-guard-interval CO-OFDM transmission over 2000 km of ultra-large-area fiber and five 80-GHz-grid ROADMs,” J. Lightwave Technol.29(4), 483–490 (2011).
[CrossRef]

Chang, F.

F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag.48(3), S48–S55 (2010).
[CrossRef]

Chen, X.

Chraplyvy, A. R.

Digiovanni, D. J.

Dimarcello, F. V.

Fini, J. M.

Fishteyn, M.

Gnauck, A.

Gnauck, A. H.

Liu, X.

S. Chandrasekhar, A. H. Gnauck, X. Liu, P. J. Winzer, Y. Pan, E. C. Burrows, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “WDM/SDM transmission of 10 x 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 km·b/s/Hz,” Opt. Express20(2), 706–711 (2012).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, P. J. Winzer, A. R. Chraplyvy, R. W. Tkach, B. Zhu, T. F. Taunay, M. Fishteyn, and D. J. Digiovanni, “Scrambled coherent superposition for enhanced optical fiber communication in the nonlinear transmission regime,” Opt. Express20(17), 19088–19095 (2012).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency,” Opt. Express19(26), B958–B964 (2011).
[CrossRef] [PubMed]

B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s Space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express19(17), 16665–16671 (2011).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, B. Zhu, P. Winzer, A. Gnauck, and D. Peckham, “448-Gb/s reduced-guard-interval CO-OFDM transmission over 2000 km of ultra-large-area fiber and five 80-GHz-grid ROADMs,” J. Lightwave Technol.29(4), 483–490 (2011).
[CrossRef]

Mizuochi, T.

F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag.48(3), S48–S55 (2010).
[CrossRef]

Monberg, E. M.

Onohara, K.

F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag.48(3), S48–S55 (2010).
[CrossRef]

Pan, Y.

Peckham, D.

Taunay, T. F.

Tkach, R. W.

Winzer, P.

Winzer, P. J.

Yan, M. F.

Zhu, B.

X. Liu, S. Chandrasekhar, P. J. Winzer, A. R. Chraplyvy, R. W. Tkach, B. Zhu, T. F. Taunay, M. Fishteyn, and D. J. Digiovanni, “Scrambled coherent superposition for enhanced optical fiber communication in the nonlinear transmission regime,” Opt. Express20(17), 19088–19095 (2012).
[CrossRef] [PubMed]

S. Chandrasekhar, A. H. Gnauck, X. Liu, P. J. Winzer, Y. Pan, E. C. Burrows, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “WDM/SDM transmission of 10 x 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 km·b/s/Hz,” Opt. Express20(2), 706–711 (2012).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, B. Zhu, P. Winzer, A. Gnauck, and D. Peckham, “448-Gb/s reduced-guard-interval CO-OFDM transmission over 2000 km of ultra-large-area fiber and five 80-GHz-grid ROADMs,” J. Lightwave Technol.29(4), 483–490 (2011).
[CrossRef]

B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s Space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express19(17), 16665–16671 (2011).
[CrossRef] [PubMed]

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency,” Opt. Express19(26), B958–B964 (2011).
[CrossRef] [PubMed]

IEEE Commun. Mag.

F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag.48(3), S48–S55 (2010).
[CrossRef]

J. Lightwave Technol.

Opt. Express

Other

J. Sakaguchi, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi, T. Hayashi, T. Taru, T. Kobayashi, M. Watanabe, “109-Tb/s (7x97x172-Gb/s) SDM/WDM/PDM) QPSK transmission through 16.8-km homogeneous multicore fiber,” OFC’11, PDPB6 (2011).

X. Liu, S. Chandrasekhar, A. H. Gnauck, P. J. Winzer, S. Randel, S. Corteselli, B. Zhu, T. Taunay, and M. Fishteyn, “Digital coherent superposition for performance improvement of spatially multiplexed 676-Gb/s OFDM-16QAM superchannels,” in Proceedings of the 2012 European Conference on Optical Communication (Amsterdam, Netherlands), paper Tu.3.C.2 (2012).

X. Liu, S. Chandrasekhar, A. H. Gnauck, P. J. Winzer, A. R. Chraplyvy, B. Zhu, T. Taunay, and M. Fishteyn, “Performance improvement of space-division multiplexed 128-Gb/s PDM-QPSK signals by constructive superposition in a single-input-multiple-output configuration,” in Proceedings of the 2012 Optical Fiber Communication Conference (Optical Society of America, Washington, DC, 2012), OTu1D3.

H. Takara, A. Sano, T. Kobayashi, H. Kubota, H. Kawakami, A. Matsuura, Y. Miyamoto, Y. Abe, H. Ono, K. Shikama, Y. Goto, K. Tsujikawa, Y. Sasaki, I. Ishida, K. Takenaga, S. Matsuo, K. Saitoh, M. Koshiba, and T. Morioka, “1.01-Pb/s (12 SDM/222 WDM/456 Gb/s) Crosstalk-managed transmission with 91.4-b/s/Hz aggregate spectral efficiency,” in Proceedings of the 2012 European Conference on Optical Communication (Amsterdam, Netherlands), paper Th.3.C.1 (2012).

Y. Miyata, K. Sugihara, W. Matsumoto, K. Onohara, T. Sugihara, K. Kubo, H. Yoshida, and T. Mizuochi, “A triple-concatenated FEC using soft-decision decoding for 100 Gb/s optical transmission,” in Optical Fiber Communication conference and National Fiber Optic Engineers Conference2010, paper OThL3.

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Figures (5)

Fig. 1
Fig. 1

Schematic of the experimental setup. Insets: (a) measured optical spectrum of the eight WDM superchannels; (b) measured optical spectrum of a 676-Gb/s superchannel; and (c) typical recovered subcarrier constellation of the superchannel in back-to-back configuration. MCG: multi-carrier generator; WSS: wavelength-selective switch; OC: optical coupler; PDM: polarization-division multiplexer; SW: switch; EDFA: Erbium-doped fiber amplifier, TMC: tapered multi-core coupler; OLO: optical local oscillator; ADC: analog-to-digital converter.

Fig. 2
Fig. 2

Measured back-to-back BER performance of a 676-Gb/s superchannel without DCS and with DCS of two SDM copies. Insets: (a) recovered subcarrier constellations without DCS; and (b) recovered subcarrier constellations with DCS at 22-dB and 26-dB OSNR.

Fig. 3
Fig. 3

Measured Q2 factor as a function of superchannel launch power per per core at a distance of 1075 km without and with DCS. The results obtained by SCS are also shown.

Fig. 4
Fig. 4

Measured Q2 factor improvement vs. number of superimposed signals (m) after 1075-km transmission with 0-dBm signal launch power. Insets: typical recovered constellations at different m-values.

Fig. 5
Fig. 5

Recovered signal constellations after 1075-km transmission with 4-dBm signal launch power without DCS and with SCS using the outputs from 4 fiber cores. The scrambling functions used for different cores are shown in the right subplot.

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