What Is OSFP? Definition and Key Facts
OSFP (Octal Small Form-factor Pluggable) is a larger 400G/800G pluggable transceiver format with superior thermal headroom, used in AI clusters and coherent DCI links.
OSFP (Octal Small Form-factor Pluggable) is a pluggable optical transceiver form factor designed for high-speed networks from 400G upward. Like QSFP-DD it uses eight 50 Gb/s PAM4 electrical lanes at 400G, but in a noticeably larger body with an integrated heatsink.
Key facts:
- Dimensions: roughly 22.6 mm wide, 108 mm long, 13 mm thick — larger than QSFP-DD.
- Density: about 32 ports per 1U panel.
- Backward compatibility: none with QSFP-series modules; adapters are required and carry signal-integrity risk.
- Power: supports modules up to roughly 25 W, making it the preferred platform for coherent 400G ZR/ZR+ and high-power 800G optics.
- Future proofing: the same cage family extends to 800G and 1.6T.
OSFP is common in AI/ML cluster switches and data center interconnect (DCI) equipment where thermal headroom matters more than port density.
Related: What is QSFP-DD? · What is PAM4? · QSFP-DD vs OSFP comparison
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