Optical modules are available in various types to meet diversified requirements. Depending on transmission rates, optical modules are classified into 100GE, 40GE, 25GE, 10GE, FE, and GE optical modules. The higher transmission rate an optical module provides, the more complex. This article provides a comprehensive comparison of mainstream optical transceivers, including SFP, SFP+, QSFP+, QSFP28, and QSFP-DD. Its primary function is to achieve optoelectronic conversion by converting electrical signals into optical signals and vice versa. However, for those who get in touch with them for the first time, just like me, maybe most information, is unfamiliar to them.