A plethora of product demonstrations and announcements were made at OFC 2019 in San Diego. The announcements centered on 400GbE for datacom transceivers for data center switches, service provider routers, and client-side interfaces for optical transport equipment, as well as 400G ZR for DCI and ZR+ metro-regional applications. Significant progress was demonstrated in terms of performance, size, and power dissipation, enabling solutions utilizing popular form factors including OSFP and QSFP-DD. Vendors have begun commercial release of 400GbE datacom products, and several vendors are planning to start customer sampling of 400G ZR transceivers in 4Q19. Clients, please log in to view the full content.