Abstract
We demonstrate a 4-level pulse-amplitude-modulation (PAM-4) transmission system direct-detected by germanium-silicon (Ge-Si) photodiode (PD). Volterra-equalization is used to compensate signal distortion and 40-Gibt/s and 50-Gbit/s PAM-4 signals after 20-km and 10-km fiber transmissions are achieved.
© 2017 Optical Society of America
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