Axiom Memory QDD-2X400G-LR4-AX 800G QSFP-DD 2x400G LR4 Optical Module

Connect two 400 Gigabit LR4 optical paths through a single 800G QSFP-DD host interface. Axiom Memory QDD-2X400G-LR4-AX is an 800G optical transceiver arranged as two 400G LR4 links, allowing high-density equipment to carry dual 400G connections from one module position. Its Cisco-compatible coding supports deployments built around compatible Cisco networking equipment. The module uses two LC duplex optical connections and single-mode fiber for links up to 10 km. That connector arrangement supports fiber runs where LC duplex patching is already present, rather than requiring a multi-fiber MPO connection. Operation across the 1271-1331 nm wavelength range corresponds to LR4 optical transport across four wavelength channels per 400G link. This configuration fits aggregation, spine, core, and inter-building links that require two independent 400G optical connections but have an 800G QSFP-DD interface available at the host. The distinguishing characteristic is its dual-LR4 architecture: it combines two 400G LR4 optical paths, two LC duplex connections, and 10 km single-mode reach in one QSFP-DD module. Match the required host interface, Cisco compatibility requirement, fiber type, connector count, and 10 km link budget before deployment.