All-optical Ethernet switches represent a major step forward in network design, providing pure fiber connectivity for superior bandwidth, lower latency, better reliability, and simplified cabling. From Jensen Huang showcasing CPO switches at GTC 2025 to a wide range of vendors demonstrating optical engines integrated inside ASIC. The economics and physics of data center networking are converging on a single conclusion: the traditional model of pluggable optical transceivers, separated from the switch Application-Specific Integrated Circuit (ASIC) by centimeters of printed circuit board trace, cannot continue to scale. As. Switches come in three types: those with purely Ethernet ports, those with purely optical ports, and those with a combination of both. RJ45 ports serve access-layer copper connections; SFP/SFP+ ports enable flexible 1G/10G uplinks; SFP28 delivers 25G for modern data centers; QSFP+ and QSFP28 support high-density 40G/100G spine–leaf. The Basics: These acronyms define the form factor and speed of a pluggable optical transceiver. Choosing the wrong one leads to physical layer link failures. SFP/SFP+: The standard for 1G/10G campus and server connectivity.
