To meet the growing requirements of collaborative multimedia services and applications, to respond to the fast-changing traffic patterns, and to better accommodate users’ bandwidth demands, 100G connections have been positioned for significant growth in data centers with the introduction of the latest 100G optical modules. The upgrade to 100Gbps is not more than gaining capacity. It’s also about gracefully evolving your network at your own pace to achieve greater efficiency, streamline costs and support new services. Many systems now support four or more 100G ports on each line card, with some systems supporting many hundreds of 100G ports. 100G optical modules, as an integral part of the overall system design, support highly reliable operations, optimized for entire architecture. This article puts its focus on one predominant 100G form factor: QSFP28.