The letter 'g' in optical module terminology is used to denote the data rate in gigabits per second (Gbps). For example, in a module labeled 100G, the "G" represents 100 gigabits per second, while in 1G or 10G modules, it represents 1 or 10 gigabits per second, respectively. This convention helps network engineers quickly identify the speed capability of the transceiver.
Optical modules, such as SFP, QSFP, CFP, and CFP2/CFP4, are designed to transmit data over fiber optic cables at specific speeds. The 'g' is part of the module's naming standard to indicate its bandwidth capacity:
Optical modules also include other letters to indicate reach or fiber type, such as:
The 'g' in an optical module always refers to "Gigabit", specifying the module's data rate. Understanding this, along with distance and fiber type acronyms, allows proper selection of optical transceivers for data center, metro, or long-haul network applications.
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