Axiom 25GBASE-BX40-U SFP+ for Cisco 25 Gbps | BiDi, Single-Mode — SFP-25G-BX40U-I-AX

Move 25 GbE traffic across longer single-mode links with a 25GBASE-BX40-U SFP+ optic built for Cisco environments. This bidirectional transceiver is designed for 25 Gbps Ethernet and supports up to 40 km reach, making it suitable for campus interconnects, aggregation links, and other extended runs where standard short-reach optics are not enough. The BiDi architecture carries traffic over a single fiber pair, which helps reduce cabling complexity and conserve fiber plant capacity. That matters in networks where available strands are limited or where expansion must happen without major recabling. The SFP+ form factor keeps it compatible with established switching platforms while preserving the density and serviceability expected in production infrastructure. For infrastructure teams, this module is about efficiency and control: longer reach, fewer fibers, and a Cisco-aligned optic for environments that need predictable interoperability. For procurement, it offers a targeted alternative to over-specifying optics for links that demand distance rather than short-reach economics. Ideal For 25 GbE campus interconnects between network buildings Aggregation uplinks over single-mode fiber Fiber-constrained deployments that need bidirectional optics Cisco-based access or distribution links requiring extended reach Why This Product 1 BiDi design reduces fiber count versus standard duplex optics 2 40 km reach supports longer campus and inter-building links 3 SFP+ form factor fits established Cisco switching platforms 4 Single-mode operation suits extended-distance 25 GbE transport