The hottest topic at this year’s ECOC was 400G ZR, which holds the promise of finally enabling IP optical convergence at 400G using small form factor (SFF) pluggable transponders that can be plugged directly into routers and switches. 400G ZR is an OIF implementation agreement (IA) that is broadly supported by module vendors, coherent optical components suppliers, equipment vendors, and hyperscale data center operators. It is focused on DCI and point-to-point router connectivity applications. Another notable happening at ECOC was confirmation that availability of 400G datacom transceivers would be pushed out again. Product introduction dates are now delayed over one year from the original schedule; there are still technical issues with these products that must be resolved prior to general availability. Transceiver vendors are currently sampling 400G DR4s to key hyperscale customers. During OFC in March, vendors indicated that 400G DR4 transceivers would be released in 2H19. The new commercial release schedule from leading vendors is now 1Q20. Clients, please log in to view the full content.