Abstract

We experimentally demonstrate the generation and transmission of a single-lane $180\mathrm{Gbit}/\mathrm{s}$ (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: $150\text{Gbit}/\mathrm{s}$. A net data rate of $168\text{Gbit}/\mathrm{s}$ 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 bandwidth-constrained system. Both a feed-forward equalizer and a maximum-likelihood sequence estimator are investigated for data recovery.

© 2016 Optical Society of America

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