6T OSFP 4xFR2 PAM4 Optical Transceiver Module (1291/1311nm SN SMF 2km)Product DetailsAlistar P/N OSFP-1. 6T-4FR2Vendor Name AlistarForm Factor OSFPMax Data Rate 1x1. 6T, 2x800G, 4x400G, 8x200GWavelength 1291/1311nmMax Distance 2kmModulation Format PAM4Connector . Customized 400GBASE-SR4 OSFP Flat Top PAM4 850nm 50m DOM MPO-12/APC MMF Optical Transceiver Module - FS. com Europe FS EuropeFREE SHIPPING on Orders Over EUR 79 VAT excl. Germany. Enter OSFP (Octal Small Form Factor Pluggable) — an open standard designed to deliver scalable, thermally optimized, and high-density optical connectivity for hyperscale, cloud, and AI-driven environments. Unlike the backward-compatible QSFP-DD, OSFP introduces a slightly larger mechanical form to. This specification defines the electrical connectors, electrical signals and power supplies, mechanical and thermal requirements of the OSFP Module, connector and cage systems. 25 Gbps PAM4 per lane, achieving a total bandwidth of 800 Gbps over single-mode fiber. For 400G optical transceivers, both OSFP and QSFP-DD use the 8x50G/PAM4 electrical signal for the host interface, which means they both employ PAM4 modulation. This article will introduce the PAM4 modulation scheme and its application in 400G transceivers.