Journal
OPTICS LETTERS
Volume 41, Issue 19, Pages 4449-4452Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.004449
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We experimentally demonstrate the generation and transmission of a single-lane 180 Gbit/s (90 GBaud) four-level pulse-amplitude modulation (PAM-4) signal in an intensity-modulation direct-detection system with a 7.5 GHz 3 dB bandwidth. The generated signal is transmitted over a 2 km standard single-mode fiber with, to the best of our knowledge, the highest reported net data rate in the C-band: 150 Gbit/s. A net data rate of 168 Gbit/s is also reachable with 1 km reach. The PAM-4 and duobinary (DB) PAM-4 modulation schemes are compared; the obtained results show that DB-PAM-4 significantly outperforms PAM-4 in the considered strong bandwidthconstrained system. Both a feed-forward equalizer and a maximum-likelihood sequence estimator are investigated for data recovery. (C) 2016 Optical Society of America
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