Carry 100 GbE traffic across long-distance optical paths with a Fujitsu HCD00D40C0000-0 compatible QSFP28 transceiver from AddOn. Designed for 100GBase-ER4 applications, this module supports single-mode fiber links up to 40 km, making it a strong fit for campus backbones, metro extensions, and inter-building connectivity where shorter-reach optics are not enough. The LC interface keeps integration straightforward in environments that already standardize on duplex fiber infrastructure. Hot-swappable construction helps reduce maintenance friction, while the QSFP28 form factor preserves compatibility with high-density switching and routing platforms. For teams managing critical transport links, that combination matters: long reach, compact packaging, and a replacement path that does not force a redesign. This module is also a practical procurement choice for organizations that need verified compatibility with Fujitsu transceiver requirements without paying for original-brand optics. It is the kind of component that supports uptime, simplifies spares planning, and fits the economics of enterprise network operations.