Common speeds for optical modules

Optical modules commonly support speeds ranging from 1 Gbps to 400 Gbps, depending on form factor and application.

SF

P FamilySFP (Small Form-Factor Pluggable): Typically supports 1 Gbps, used in access networks and legacy systems for short- or medium-range links over multimode or single-mode fiber. SFP+: Supports up to 10 Gbps, widely used in enterprise and data center uplinks, balancing cost, density, and power. SFP28: Supports 25 Gbps, maintaining the same physical footprint as SFP while providing higher bandwidth for modern NICs and switch ASICs.

QSF

P FamilyQSFP (Quad Small Form-Factor Pluggable): Supports 40 Gbps, often used for high-speed aggregation in data centers. QSFP28: Supports 100 Gbps, commonly deployed in cloud and hyperscale networks for high-density, high-bandwidth links. QSFP56: Supports 200 Gbps, providing higher per-port bandwidth for modern data center architectures.

QSFP-DD (Double Density): Supports up to 400 Gbps, featuring an upgraded electrical interface while remaining backward compatible with QSFP and QSFP28 ports.

Key Considerations

Fiber Type: Multimode (OM3/OM4) is suitable for shorter distances, while single-mode fiber (OS2) supports longer links. Reach: 1G SFP modules can reach a few hundred meters on multimode fiber or up to 10 km on single-mode; 10G SFP+ modules typically reach hundreds of meters on multimode and 10 km on single-mode. Electrical Interface: Ensure compatibility with host switch or router; SFP28 and QSFP-DD modules require modern NICs and ASICs to fully utilize their speed.

Power and Cooling: Higher-speed modules consume more power and may require additional cooling in dense deployments. In summary, 1G, 10G, 25G, 40G, 100G, 200G, and 400G are the most common optical module speeds, with the choice depending on network requirements, fiber type, reach, and equipment compatibility.