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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 15,
  • Issue 2,
  • pp. 022502-
  • (2017)

Upstream dispersion management of 25 Gb/s duobinary and PAM-4 signals to support 0–40 km differential reach

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Abstract

We extensively discuss 25 Gb/s per wavelength capacity in both IEEE and ITU-T standardization to support the increasing bandwidth requirement. In this Letter, we propose to use the optical dispersion compensation technique in an optical line terminal (OLT) combined with a bandwidth-limited electro-absorption modulated laser in an optical network unit to achieve 25 Gb/s capacity for the upstream link. We evaluate the positive and negative dispersion tolerances of 25 Gb/s electrical duo-binary (EDB) and pulse-amplitude modulation (PAM-4) signals. We achieve 39.5 and 31 dB upstream loss budgets for the 25 Gb/s EDB and PAM-4 signals by using −600 and −500 ps/nm optical dispersion compensation in OLT, respectively, both supporting 0–40 km differential reach.

© 2017 Chinese Laser Press

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