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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 30, Iss. 4 — Feb. 12, 2012
  • pp: 553–559

PDM-Nyquist-32QAM for 450-Gb/s Per-Channel WDM Transmission on the 50 GHz ITU-T Grid

Xiang Zhou, Lynn E. Nelson, Peter Magill, Rejoy Isaac, Benyuan Zhu, David W. Peckham, Peter I. Borel, and Kenneth Carlson

Journal of Lightwave Technology, Vol. 30, Issue 4, pp. 553-559 (2012)


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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

Citation
Xiang Zhou, Lynn E. Nelson, Peter Magill, Rejoy Isaac, Benyuan Zhu, David W. Peckham, Peter I. Borel, and Kenneth Carlson, "PDM-Nyquist-32QAM for 450-Gb/s Per-Channel WDM Transmission on the 50 GHz ITU-T Grid," J. Lightwave Technol. 30, 553-559 (2012)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-30-4-553

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