OSFP is a new pluggable form factor with eight high speed electrical lanes that will initially support 400Gb/s (8x50G) or reach up to 800Gb/s. The width, length and thickness of QSFP-DD are 18. Cisco QSFP-DD and OSFP 800G ZR/ZR+ digital coherent optics modules enable 800G traffic over amplified Dense Wavelength-Division Multiplexing (DWDM) links up to 120 km for 800ZR and over 1000 km for 800G ZR+. The “double density” means the doubling of the number of high-speed electrical interfaces that the module supports compared with a. This guide cuts through marketing claims and provides the technical clarity you need to make an informed QSFP-DD vs OSFP decision for your optical transceiver deployment. We examine specifications, real-world deployment scenarios, compatibility matrices, and future-proofing considerations to help. Pro Tip: In 2025, QSFP112 is gaining traction as a bridge technology. It allows 400G speeds in a native 4-lane configuration, reducing the complexity of breakout cables required by early 400G QSFP-DD (8-lane) implementations. Deep Dive: SFP Standards Evolution (Access & Edge) The "Small. To support 800G and higher data rates, two main form factors have emerged in the industry: QSFP-DD (Quad Small Form-factor Pluggable Double Density) and OSFP (Octal Small Form-factor Pluggable). Both represent significant advancements over previous generations.