Cisco SP-AR1-DP4Q1SAI 400Gbps Coherent QSFP-DD Ultra Long Haul | Optics — SP-AR1-DP4Q1SAI

Carry 400 Gbps traffic across long-haul optical paths with a coherent QSFP-DD module designed for demanding transport networks. This Cisco optic is built for environments where distance, spectral efficiency, and stable high-capacity transmission matter more than commodity short-reach connectivity. The coherent design supports ultra long haul deployment scenarios in service provider and large enterprise backbones, where links must span significant distances while preserving throughput and operational consistency. QSFP-DD packaging helps maintain density on modern platforms, making it suitable for systems that need high-capacity optics without expanding footprint. For network teams planning backbone upgrades, this module fits the class of deployments that justify premium transport optics: metro-to-long-haul interconnects, core network extensions, and high-value links where downtime or signal degradation carries real cost. It is the right choice when the network must move beyond standard reach and into transport-grade optical performance. Ideal For Service provider backbone links spanning long-haul routes Core network extensions between regional data centers High-capacity metro transport where coherent optics are required Enterprise WAN aggregation over long-distance optical paths Why This Product 1 Coherent optics for long-distance transport 2 400 Gbps capacity for backbone links 3 QSFP-DD form factor for dense platforms 4 Built for ultra long haul deployments