Abstract

We discuss the generation and transmission of 450 Gb/s wavelength-division multiplexed (WDM) channels over the standard 50 GHz ITU-T grid optical network at a net spectral efficiency of 8.4 b/s/Hz. This result is accomplished by the use of Nyquist-shaped, polarization-division-multiplexed (PDM) 32-quadrature amplitude modulation (QAM) and both pre- and post-transmission digital equalization. To overcome the limitation of available digital-to-analog converter bandwidth, a novel method is introduced for the generation of the five-subcarriers of the 450 Gb/s signal. Nearly ideal Nyquist pulse-shaping (roll-off factor = 0.01) enables guard bands of only 200 MHz between subcarriers. To mitigate the narrow optical filtering effects from the 50 GHz-grid reconfigurable optical add-drop multiplexer (ROADM), a broadband optical pulse-shaping method has been proposed and demonstrated. By combined use of electrical and optical shaping techniques, transmission of 5 × 450 Gb/s PDM-Nyquist 32 QAM on the 50 GHz grid over 800 km and one 50 GHz-grid ROADM has been successfully demonstrated.

© 2011 IEEE

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  1. M. Camera, B. E. Olsson, G. Bruno, "Beyond 100 Gbit/s: System implications towards 400 G and 1 T," Proc. ECOC Symp. Toward 1 Tb/s (2010).
  2. C. Cole, "Is 1 Tb/s ready for prime time? Engineering reality check," Proc. IEEE Photon. Soc. Summer Top. Meeting Terabit Optical Ethernet (2011) pp. 18-20.
  3. X. Liu, S. Chandrasekhar, B. Zhu, A. H. Gnauck, D. W. Peckham, "Transmission of a 448-Gb/s reduced-guard-interval CO-OFDM signal with a 60-GHz optical bandwidth over 2000 km of ULAF and five 80-GHz-Grid ROADMs," Proc. OFC-NFOEC (2010).
  4. S. Chandrasekhar, X. Liu, B. Zhu, D. W. Peckham, "Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber," Proc. ECOC (2009).
  5. P. J. Winzer, A. H. Gnauck, S. Chandrasekhar, S. Draving, J. Evangelista, B. Zhu, "Generation and 1 200-km transmission of 448-Gb/s ETDM 56-Gbaud PDM 16-QAM using a single I/Q modulator," Proc. ECOC (2010).
  6. A. H. Gnauck, P. J. Winzer, S. Chandrasekhar, X. Liu, B. Zhu, D. W. Peckham, "10$\,\times\,$224-Gb/s WDM transmission of 28-Gbaud PDM 16-QAM on a 50-GHz grid over 1 200 km of fiber," Proc. OFC-NFOEC (2010).
  7. Y.-K. Huang, E. Ip, M.-F. Huang, B. Zhu, P. N. Ji, Y. Shao, D. W. Peckham, R. Lingle, Jr.Y. Aono, T. Tajima, T. Wang, "10$\,\times\,$456-Gb/s DP-16QAM transmission over 8$\,\times\,$100 km of ULAF using coherent detection with a 30-GHz analog-to-digital converter," Proc. OECC (2010).
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  9. X. Zhou, L. E. Nelson, P. Magill, R. Issac, B. Zhu, D. W. Peckham, P. Borel, K. Carlson, "8$\,\times\,$450-Gb/s, 50-GHz-spaced, PDM-32QAM transmission over 400 km and one 50 GHz-grid ROADM," Proc. OFC- NFOEC (2011).
  10. X. Zhou, L. E. Nelson, P. Magill, R. Issac, B. Zhu, D. W. Peckham, P. Borel, K. Carlson, "800 km transmission of 5$\,\times\,$450-Gb/s PDM-32QAM on the 50 GHz grid using electrical and optical spectral shaping," ECOC GenevaSwitzerland (2011) paper We.8.B.2.
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2011 (1)

X. Zhou, J. Yu, M. F. Huang, Y. Shao, T. Wang, L. Nelson, P. D. Magill1, M. Birk, P. I. Borel, D. W. Peckham, R. Lingle, "64-Tb/s, 8 b/s/Hz, PDM-36QAM transmission over 320 km using both pre- and post-transmission digital signal processing," J. Lightw. Technol. 29, 571-577 (2011).

2010 (2)

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).

F. Chang, K. Onohara, T. Mizuochi, "Forward error correction for 100 G transport netwroks," IEEE Commun. Mag. 48, S48-S55 (2010).

2009 (1)

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

1999 (1)

M. Tomizawa, Y. Yamabayashi, "Parallel FEC code in high-speed optical transmission systems," Electron. Lett. 35, 1367-1368 (1999).

Electron. Lett. (1)

M. Tomizawa, Y. Yamabayashi, "Parallel FEC code in high-speed optical transmission systems," Electron. Lett. 35, 1367-1368 (1999).

IEEE Commun. Mag. (1)

F. Chang, K. Onohara, T. Mizuochi, "Forward error correction for 100 G transport netwroks," IEEE Commun. Mag. 48, S48-S55 (2010).

IEEE Photon. Technol. Lett. (1)

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).

J. Lightw. Technol. (2)

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

X. Zhou, J. Yu, M. F. Huang, Y. Shao, T. Wang, L. Nelson, P. D. Magill1, M. Birk, P. I. Borel, D. W. Peckham, R. Lingle, "64-Tb/s, 8 b/s/Hz, PDM-36QAM transmission over 320 km using both pre- and post-transmission digital signal processing," J. Lightw. Technol. 29, 571-577 (2011).

Other (10)

M. Camera, B. E. Olsson, G. Bruno, "Beyond 100 Gbit/s: System implications towards 400 G and 1 T," Proc. ECOC Symp. Toward 1 Tb/s (2010).

C. Cole, "Is 1 Tb/s ready for prime time? Engineering reality check," Proc. IEEE Photon. Soc. Summer Top. Meeting Terabit Optical Ethernet (2011) pp. 18-20.

X. Liu, S. Chandrasekhar, B. Zhu, A. H. Gnauck, D. W. Peckham, "Transmission of a 448-Gb/s reduced-guard-interval CO-OFDM signal with a 60-GHz optical bandwidth over 2000 km of ULAF and five 80-GHz-Grid ROADMs," Proc. OFC-NFOEC (2010).

S. Chandrasekhar, X. Liu, B. Zhu, D. W. Peckham, "Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber," Proc. ECOC (2009).

P. J. Winzer, A. H. Gnauck, S. Chandrasekhar, S. Draving, J. Evangelista, B. Zhu, "Generation and 1 200-km transmission of 448-Gb/s ETDM 56-Gbaud PDM 16-QAM using a single I/Q modulator," Proc. ECOC (2010).

A. H. Gnauck, P. J. Winzer, S. Chandrasekhar, X. Liu, B. Zhu, D. W. Peckham, "10$\,\times\,$224-Gb/s WDM transmission of 28-Gbaud PDM 16-QAM on a 50-GHz grid over 1 200 km of fiber," Proc. OFC-NFOEC (2010).

Y.-K. Huang, E. Ip, M.-F. Huang, B. Zhu, P. N. Ji, Y. Shao, D. W. Peckham, R. Lingle, Jr.Y. Aono, T. Tajima, T. Wang, "10$\,\times\,$456-Gb/s DP-16QAM transmission over 8$\,\times\,$100 km of ULAF using coherent detection with a 30-GHz analog-to-digital converter," Proc. OECC (2010).

H. Takahashi, K. Takeshima, I. Morita, H. Tanaka, "400-Gbit/s optical OFDM transmission over 80 km in 50-GHz frequency grid," Proc. ECOC (2010).

X. Zhou, L. E. Nelson, P. Magill, R. Issac, B. Zhu, D. W. Peckham, P. Borel, K. Carlson, "8$\,\times\,$450-Gb/s, 50-GHz-spaced, PDM-32QAM transmission over 400 km and one 50 GHz-grid ROADM," Proc. OFC- NFOEC (2011).

X. Zhou, L. E. Nelson, P. Magill, R. Issac, B. Zhu, D. W. Peckham, P. Borel, K. Carlson, "800 km transmission of 5$\,\times\,$450-Gb/s PDM-32QAM on the 50 GHz grid using electrical and optical spectral shaping," ECOC GenevaSwitzerland (2011) paper We.8.B.2.

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