No, an SFP (or SFP+) optical module cannot be directly plugged into an XFP port due to differences in size, electrical interface, and protocol handling.

Physical and Electrical Incompatibility

XFP and SFP+ modules have different form factors: XFP is larger (8.5 mm × 18.35 mm × 78 mm) compared to SFP+ (8.5 mm × 13.4 mm × 56.5 mm) and uses a different electrical interface (XFI for XFP vs SFI for SFP+) which makes them physically and electrically incompatible. Therefore, an SFP+ module cannot fit into an XFP port, and vice versa ( ).

Network-Level Interoperability

Although the modules themselves cannot be swapped in the same port, XFP and SFP+ modules can communicate over the network if they operate at the same wavelength, data rate (10 Gbps), and fiber type. For example, a 10G XFP module at 1310 nm can connect to a 10G SFP+ module at 1310 nm using standard LC duplex fiber ( ).

Workarounds for Connecting XFP and SFP+

1. Direct Fiber Connection: Use an XFP module in an XFP port and an SFP+ module in an SFP+ port, connected via a fiber patch cable with matching wavelength and fiber type ( ).
2. XFP to SFP+ DAC Cable: A direct attach copper cable with an XFP connector on one end and an SFP+ connector on the other can link devices over short distances ( ).
3. XFP to SFP+ Converter/Adapter: Specialized converters allow an XFP port to interface with an SFP+ module, effectively bridging the two standards ( ).

Summary

• Direct insertion of an SFP or SFP+ module into an XFP port is not possible due to size and electrical differences.
• Interoperability is achievable at the network level if wavelength, data rate, and fiber type match.
• Adapters, DAC cables, or fiber patch connections are required to connect XFP and SFP+ modules in practice. For modern 10G deployments, SFP+ is generally preferred due to smaller size, lower power consumption, and better scalability, while XFP is mostly used in legacy systems ( ).