Abstract

We report the successful transmission of 64 Tb/s capacity (640$\,\times\,$107 Gb/s with 12.5 GHz channel spacing) over 320 km reach utilizing 8-THz of spectrum in the ${\rm C}+{\rm L}$-bands at a net spectral efficiency of 8 bit/s/Hz. Such a result is accomplished by the use of raised-cosine pulse-shaped PDM-36QAM modulation, intradyne detection, both pre- and post-transmission digital equalization, and ultra-large-area fiber. We discuss in detail the digital modulation technology and signal processing algorithms used in the experiment, including a new two-stage, blind frequency-search-based frequency-offset estimation algorithm and a more computationally efficient carrier-phase recovery algorithm.

© 2011 IEEE

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  1. J. Yu, X. Zhou, M. F. Huang, Y. Shao, D. Qian, T. Wang, M. Cvijetic, P. Magill, L. Nelson, M. Birk, S. Ten, H. B. Matthew, S. K. Mishra, "17 Tb/s (161$\,\times\,$114 Gb/s) PolMux-RZ-8PSK transmission over 662 km of ultra-low loss fiber using C-band EDFA amplification and digital coherent detection," Proc. ECOC'08 (2008).
  2. X. Zhou, J. Yu, "Multi-level, multi-dimensional coding for high-speed and high spectral-efficiency optical transmission," J. Lightw. Technol. 27, 3641-3653 (2009).
  3. X. Zhou, J. Yu, M. Huang, Y. Shao, T. Wang, P. D. Magill, M. Cvijetic, L. Nelson, M. Birk, G. Zhang, S. Ten, H. B. Matthew, S. K. Mishra, "Transmission of 32-Tb/s capacity over 580 km using RZ-shaped PDM-8QAM modulation format and cascaded multimodulus blind equalization algorithm," J. Lightw. Technol. 28, 456-464 (2010).
  4. P. J. Winzer, A. H. Gnauck, C. R. Doerr, M. Magarini, L. L. Buhl, "Spectrally efficient long-haul optical networking using 112-Gb/s polarization-multiplexed 16-QAM," J. Lightw. Technol. 28, 547-556 (2010).
  5. X. Zhou, J. Yu, M. F. Huang, Y. Shao, T. Wang, L. Nelson, P. D. Magill, M. Birk, P. I. Borel, D. W. Peckham, R. Lingle, "64-Tb/s (640$\,\times\,$107-Gb/s) PDM-36QAM transmission over 320 km using both pre- and post-transmission digital equalization," Proc. OFC'10 (2010).
  6. A. Sano, T. Kobay, H. Masuda, T. Kobayashi, M. Fujiwara, K. Horikoshi, E. Yoshida, Y. Miyamoto, M. Matsui, M. Mizoguchi, H. Yamazaki, Y. Sakamaki, H. Ishii, "69.1-Tb/s (432$\,\times\,$171-Gb/s) C- and extended L-band transmission over 240 km Using PDM-16-QAM modulation and digital coherent detection," Proc. OFC'10 (2010).
  7. H. Takahashi, A. Al Amin, S. Jansen, I. Morita, H. Tanaka, "DWDM transmission with 7.0-bit/s/Hz spectral efficiency using 8$\,\times\,$65.1-Gbit/s coherent PDM-OFDM signals," Proc. OFC'09 (2009).
  8. J. Yu, X. Zhou, Y. K. Huang, S. Gupta, M. F. Huang, T. Wang, P. Magill, "112.8-Gb/s PM-RZ-64QAM optical signal generation and transmission on a 12.5 GHz WDM grid," Proc. OFC'10 (2010).
  9. A. Sano, T. Kobayashi, A. Matsuura, S. Yamamoto, S. Yamanaka, E. Yoshida, Y. Miyamoto, M. Matsui, M. Mizoguchi, T. Mizuno, "100$\,\times\,$120-Gb/s PDM 64-QAM transmission over 160 km using linewidth-tolerant pilotless digital coherent detection," Proc. ECOC'10 (2010).
  10. J.-X. Cai, Y. Cai, C. R. Davidson, D. G. Foursa, A. Lucero, O. Sinkin, W. Patterson, A. Philipetskii, G. Mohs, N. S. Bergano, "Transmission of 96$\,\times\,$100 G pre-filtered PDM-RZ-QPSK channels with 400% spectral efficiency," Proc. OFC'10 (2010).
  11. S. L. Jansen, A. A. Amin, H. Takahashi, I. Morita, H. Tanaka, "132.2-Gb/s PDM-8QAM-OFDM transmission at 4-b/s/Hz spectral efficiency," IEEE Photon. Technol. Lett. 21, 802-804 (2009).
  12. H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "8$\,\times\,$66.8-Gbit/s coherent PDM-OFDM transmission over 640 km of SSMF at 5.6-bit/s/Hz," Proc. ECOC'08 (2008).
  13. H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "DWDM transmission with 7.0-bit/s/Hz spectral efficiency using 8$\,\times\,$65.1-Gbit/s PDM-OFDM," Proc. OFC (2009).
  14. X. Zhou, J. Yu, P. D. Magill, "Cascaded two-modulus algorithm for blind polarization de-multiplexing of 114-Gb/s PDM-8-QAM optical signals," Proc. OFC'09 (2009).
  15. X. Zhou, "An improved feed-forward carrier recovery algorithm for coherent receiver with M-QAM modulation format," IEEE Photon. Technol. Lett. 22, 1051-1053 (2010).
  16. X. Zhou, "A new carrier frequency recovery method for arbitrary QAM modulation," IEEE Photonics Technol. Lett. .
  17. T. Pfau, S. Hoffmann, R. Noé, "Hardware-efficient coherent digital receiver concept with feed-forward carrier recovery for M-QAM constellations," J. Lightwave. Technol. 27, 989-999 (2009).
  18. E. IP, J. Kahn, "Feedforward carrier recovery for optical communication," J. Lightw. Technol. 25, 2675-2692 (2007).
  19. I. Fatadin, D. Ives, S. J. Savory, "Compensation of frequency offset for differentially encoded 16- and 64-QAM in the presence of laser phase noise," IEEE Photon. Technol. Lett. 22, 989-999 (2010).
  20. M. Seimetz, "Laser linewidth limitations for optical systems with high-order modulation employing feed forward digital carrier phase estimation," Proc. OFC'08 (2008).
  21. J. G. Proakis, Digital Communication (McGraw-Hill, 1995) pp. 280.

2010 (4)

X. Zhou, J. Yu, M. Huang, Y. Shao, T. Wang, P. D. Magill, M. Cvijetic, L. Nelson, M. Birk, G. Zhang, S. Ten, H. B. Matthew, S. K. Mishra, "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, 456-464 (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, "An improved feed-forward carrier recovery algorithm for coherent receiver with M-QAM modulation format," IEEE Photon. Technol. Lett. 22, 1051-1053 (2010).

I. Fatadin, D. Ives, S. J. Savory, "Compensation of frequency offset for differentially encoded 16- and 64-QAM in the presence of laser phase noise," IEEE Photon. Technol. Lett. 22, 989-999 (2010).

2009 (3)

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).

T. Pfau, S. Hoffmann, R. Noé, "Hardware-efficient coherent digital receiver concept with feed-forward carrier recovery for M-QAM constellations," J. Lightwave. Technol. 27, 989-999 (2009).

S. L. Jansen, A. A. Amin, H. Takahashi, I. Morita, H. Tanaka, "132.2-Gb/s PDM-8QAM-OFDM transmission at 4-b/s/Hz spectral efficiency," IEEE Photon. Technol. Lett. 21, 802-804 (2009).

2007 (1)

E. IP, J. Kahn, "Feedforward carrier recovery for optical communication," J. Lightw. Technol. 25, 2675-2692 (2007).

IEEE Photon. Technol. Lett. (3)

S. L. Jansen, A. A. Amin, H. Takahashi, I. Morita, H. Tanaka, "132.2-Gb/s PDM-8QAM-OFDM transmission at 4-b/s/Hz spectral efficiency," IEEE Photon. Technol. Lett. 21, 802-804 (2009).

X. Zhou, "An improved feed-forward carrier recovery algorithm for coherent receiver with M-QAM modulation format," IEEE Photon. Technol. Lett. 22, 1051-1053 (2010).

I. Fatadin, D. Ives, S. J. Savory, "Compensation of frequency offset for differentially encoded 16- and 64-QAM in the presence of laser phase noise," IEEE Photon. Technol. Lett. 22, 989-999 (2010).

IEEE Photonics Technol. Lett. (1)

X. Zhou, "A new carrier frequency recovery method for arbitrary QAM modulation," IEEE Photonics Technol. Lett. .

J. Lightw. Technol. (4)

E. IP, J. Kahn, "Feedforward carrier recovery for optical communication," J. Lightw. Technol. 25, 2675-2692 (2007).

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).

X. Zhou, J. Yu, M. Huang, Y. Shao, T. Wang, P. D. Magill, M. Cvijetic, L. Nelson, M. Birk, G. Zhang, S. Ten, H. B. Matthew, S. K. Mishra, "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, 456-464 (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).

J. Lightwave. Technol. (1)

T. Pfau, S. Hoffmann, R. Noé, "Hardware-efficient coherent digital receiver concept with feed-forward carrier recovery for M-QAM constellations," J. Lightwave. Technol. 27, 989-999 (2009).

Other (12)

J. Yu, X. Zhou, M. F. Huang, Y. Shao, D. Qian, T. Wang, M. Cvijetic, P. Magill, L. Nelson, M. Birk, S. Ten, H. B. Matthew, S. K. Mishra, "17 Tb/s (161$\,\times\,$114 Gb/s) PolMux-RZ-8PSK transmission over 662 km of ultra-low loss fiber using C-band EDFA amplification and digital coherent detection," Proc. ECOC'08 (2008).

H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "8$\,\times\,$66.8-Gbit/s coherent PDM-OFDM transmission over 640 km of SSMF at 5.6-bit/s/Hz," Proc. ECOC'08 (2008).

H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "DWDM transmission with 7.0-bit/s/Hz spectral efficiency using 8$\,\times\,$65.1-Gbit/s PDM-OFDM," Proc. OFC (2009).

X. Zhou, J. Yu, P. D. Magill, "Cascaded two-modulus algorithm for blind polarization de-multiplexing of 114-Gb/s PDM-8-QAM optical signals," Proc. OFC'09 (2009).

X. Zhou, J. Yu, M. F. Huang, Y. Shao, T. Wang, L. Nelson, P. D. Magill, M. Birk, P. I. Borel, D. W. Peckham, R. Lingle, "64-Tb/s (640$\,\times\,$107-Gb/s) PDM-36QAM transmission over 320 km using both pre- and post-transmission digital equalization," Proc. OFC'10 (2010).

A. Sano, T. Kobay, H. Masuda, T. Kobayashi, M. Fujiwara, K. Horikoshi, E. Yoshida, Y. Miyamoto, M. Matsui, M. Mizoguchi, H. Yamazaki, Y. Sakamaki, H. Ishii, "69.1-Tb/s (432$\,\times\,$171-Gb/s) C- and extended L-band transmission over 240 km Using PDM-16-QAM modulation and digital coherent detection," Proc. OFC'10 (2010).

H. Takahashi, A. Al Amin, S. Jansen, I. Morita, H. Tanaka, "DWDM transmission with 7.0-bit/s/Hz spectral efficiency using 8$\,\times\,$65.1-Gbit/s coherent PDM-OFDM signals," Proc. OFC'09 (2009).

J. Yu, X. Zhou, Y. K. Huang, S. Gupta, M. F. Huang, T. Wang, P. Magill, "112.8-Gb/s PM-RZ-64QAM optical signal generation and transmission on a 12.5 GHz WDM grid," Proc. OFC'10 (2010).

A. Sano, T. Kobayashi, A. Matsuura, S. Yamamoto, S. Yamanaka, E. Yoshida, Y. Miyamoto, M. Matsui, M. Mizoguchi, T. Mizuno, "100$\,\times\,$120-Gb/s PDM 64-QAM transmission over 160 km using linewidth-tolerant pilotless digital coherent detection," Proc. ECOC'10 (2010).

J.-X. Cai, Y. Cai, C. R. Davidson, D. G. Foursa, A. Lucero, O. Sinkin, W. Patterson, A. Philipetskii, G. Mohs, N. S. Bergano, "Transmission of 96$\,\times\,$100 G pre-filtered PDM-RZ-QPSK channels with 400% spectral efficiency," Proc. OFC'10 (2010).

M. Seimetz, "Laser linewidth limitations for optical systems with high-order modulation employing feed forward digital carrier phase estimation," Proc. OFC'08 (2008).

J. G. Proakis, Digital Communication (McGraw-Hill, 1995) pp. 280.

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