SFP qSFP fiber difference

　　SFP (SMall Form-Factor Pluggable) and QSFP (Quad Small Form-Factor) Pluggable) are two different types of fiber optic modules, which have significant differences in size, performance, application scenarios, etc. The following is a detailed comparison of these two fiber optic modules:

　　First, size and appearance

　　SFP module: Smaller in size, typically 29.7mm x 50.8mm x 13mm, is a small pluggable optical transceiver module.

　　QSFP module: Similar in size to SFP modules but slightly larger, typically 38.1mm x 50.8mm x 14mm, it is a small four-channel pluggable optical transceiver module.

　　Second, performance and speed

　　SFP modules: support a variety of rates, including 1Gbps, 2.5Gbps, 4Gbps and 10Gbps. Some SFP + modules can support higher rates, such as 8Gbit/s Fibre Channel, 10G Ethernet, etc.

　　QSFP Module: Supports higher rates, including 40Gbps and 100Gbps. The QSFP + module can also support higher transfer rates and is an upgraded version of the QSFP module. The QSFP28 module can meet the needs of 100G applications, with transmission rates ranging from 25Gbps to 40Gbps per channel.

　　III. Interface types and application scenarios

　　SFP module: supports a variety of interface types, such as LC, SC, FC, etc., and is suitable for scenarios such as 10Gbps Ethernet, Fibre Channel, and SONET/SDH networks. It is favored for its small size and flexible configuration, and is widely used in data centers, enterprise networks, telecommunications networks, and industrial automation.

　　QSFP modules: Usually use multi-channel interfaces such as MPO/MTP, and are suitable for scenarios such as 40Gbps and 100Gbps Ethernet, Fibre Channel, and InfiniBand networks. Since QSFP modules can provide higher port density in the same space, they are well-suited for high-density network devices.

　　IV. Cost and investment

　　SFP module: relatively low cost, suitable for cost-sensitive application scenarios.

　　QSFP modules are relatively expensive, but due to their high bandwidth and high density, they are worth the investment for applications that require high-performance networks.

　　In summary, there are significant differences between SFP and QSFP fiber modules in terms of size, performance, interface type, application scenarios, and cost. When selecting, the appropriate module type should be selected according to specific needs.