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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