Physics / mechanism
Pluggable transceivers are self-contained optical I/O modules that convert electrical signals to optical and back, enabling high-bandwidth interconnects between switches, routers, and AI/ML accelerators. The dominant form factors are QSFP-DD (8 electrical lanes, dual-density) and OSFP (larger thermal envelope, preferred for high-power DSPs). Current state-of-the-art is 800G per module using 8×100G lanes with PAM4 modulation; 1.6T (8×200G or 16×100G) is sampling now, driven by 200G-per-lane EMLs or SiPh-based coherent-lite approaches. Key parameters: power envelope (OSFP supports ~15W vs QSFP-DD’s ~12W), reach (SR4 to ZR/ZR+), and DSP power efficiency (mW/Gbps). Dominant IC suppliers: Marvell, Broadcom (Inphi), HiSilicon. Module vendors: Coherent, II-VI, InnoLight, Eoptolink.
Competitive landscape
The principal alternative is co-packaged optics (CPO), which moves optical engines onto the switch package, eliminating pluggable mechanical interfaces and the copper SerDes loss that forces power-hungry DSPs. Near-term competition also comes from Linear Drive Pluggable (LPO/LPO-AI), which strips the DSP to cut power and latency. On-board optics (OBO) sits between pluggable and CPO. For the foreseeable 3–5 year horizon, pluggables retain dominance in installed base, supply chain maturity, and replaceability.
Companies using
Connected ideas
Sources
Frontier (open questions)
- To be added.