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We demonstrate for the first time, to the best of our knowledge,reconfigurable and real-time orthogonal time-domain demultiplexing of coherentmultilevel Nyquist signals in silicon photonics. No external pulse source isneeded and frequencytime coherence is used to sample the incoming Nyquist OTDMsignal with orthogonal sinc-shaped Nyquist pulse sequences using Mach-Zehndermodulators. All the parameters such as bandwidth and channel selection arecompletely tunable in the electrical domain. The feasibility of this scheme isdemonstrated through a demultiplexing experiment over the entire C-band (1530nm - 1550 nm), employing 24 Gbaud Nyquist QAM signals due to experimentalconstraints on the transmitter side. However, the silicon Mach-Zehndermodulator with a 3-dB bandwidth of only 16 GHz can demultiplex Nyquist pulsesof 90 GHz optical bandwidth suggesting a possibility to reach symbol rates upto 90 GBd in an integrated Nyquist transceiver.

Reconfigurable and Real-Time Nyquist OTDM Demultiplexing in Silicon Photonics