There are currently many models of SFP+ optical modules on the market, such as SFP-10G-SR optical modules for multi-mode transmission, SFP-10G-LR optical modules for single-mode transmission, and SFP-10G-LR optical modules that can be used for both single-mode transmission and SFP-10G-LRM optical module for multi-mode transmission. So what is the difference between SFP-10G-LRM optical module and SFP-10G-SR optical module? And what is the difference between SFP-10G-LRM optical module and SFP-10G-