SFP+ is also called SFP plus, the enhanced version of SFP. SFP and SFP+ are identical in appearance, but SFP+ raises the data rate from 1Gbps to 10Gbps. Is it fully functional to plug SFP optics into SFP+ ports? In most cases, SFPs can work in SFP+ ports but at the cost of sacrificing speed to 1Gb/s. Owing to SFP+ is backward compatible with SFP but not vice versa. However, there is no sure say since it depends on SFP models, networking equipment, and vendors. The author suggests you consult your vendors for exact answers.