Move 100 GbE traffic across longer intra-facility distances with a CWDM4 QSFP28 optic designed for single-mode fiber deployments. This module is a practical choice for edge-core and aggregation links where multimode reach is not enough and the network needs a compact, high-speed transceiver that fits modern switching platforms. CWDM4 optics are commonly used when teams need to extend 100 GbE without moving to more expensive long-haul designs. The QSFP28 form factor keeps the footprint small, which matters in dense switch environments where every port and every rack unit counts. For infrastructure teams standardizing on single-mode fiber, this module supports a cleaner path to higher bandwidth between racks, rows, and network tiers. Choose this optic when the network design calls for 100 GbE with more reach than SR4-style short-reach modules can provide. It is built for production fabrics where link consistency, optical efficiency, and port economics directly affect the cost of scaling.