Lattice-Filter-Based LAN-WDM Silicon Photonic Transceiver System for DCI LR8 Application

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This work first establishes an 8-channel four pulse amplitude modulation (PAM-4) intensity modulation direct detection (IM-DD) optoelectronic transceiver system, with cascaded silicon Mach-Zehnder interferometer (MZI) lattice-filter technology, for high-speed and long reach (LR) (over 10 km) transmission scenario of modern data center interconnection (DCI). The compact silicon photonic (SiPh) traveling wave Mach-Zehnder modulators (TW-MZM) and silicon-germanium (SiGe) photodetectors (PD) (bandwidth >49.5 GHz with a responsivity >0.8 A/W) are homogeneously integrated with MZI lattice-filter based 8×1multiplexer (MUX) and 1×8 demultiplexer (DeMUX), respectively, endowing the system with compact structure and tunable operating wavelengths. Finally, the novel SiPh transceiver system is elaborately integrated and applied into the local area network wavelength division multiplexing (LAN-WDM) LR8 circumstance, transmitting over 10 km standard single mode fiber (SSMF), with broad bandwidth (>33 GHz), good channel response uniformity, and supports over 100 Gbps per lane for high-speed transmission, featuring proper system bit error rate (BER) performance in compliance with IEEE 802.3 standards.

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