High-Speed IM/DD System Based on OTDM Technique for Next-Generation Datacenter Network.

We report on the novel optical-time-division-multiplexing (OTDM) technique which can double the per-wavelength data rate of the intensity-modulation/direct-detection (IM/DD) system. In this technique, we utilize a sinusoidally modulated light source instead of a mode-locked laser as an input pulse source and detect the OTDM signal by using a single photodetector without the complicated optical demultiplexer. By using this technique, we demonstrate the transmission of a 300-Gb/s PAM8 signal using LiNbO 3 Mach-Zehnder modulators having a 3-dB bandwidth of only 17.2 GHz. We also fabricate the proposed OTDM transmitter in a silicon-photonics (SiP) chip and use it in the same transmission experiment.