EEPROM (Electrically Erasable Programmable Read-Only Memory) is the primary storage chip used in optical modules.

Optical modules, such as SFP, SFP+, and QSFP transceivers, incorporate EEPROM chips to store critical module-specific information and enable plug-and-play functionality in networking equipment . These non-volatile memory chips retain data even when the module is powered off and allow electrical reprogramming without external devices. The EEPROM stores details such as manufacturer information, part numbers, serial numbers, supported speeds, wavelength, fiber type, and real-time diagnostics like optical power, temperature, and voltage . In addition to EEPROM, optical modules contain other key chips, including DSPs (Digital Signal Processors) for main control, driver ICs for laser modulation, TIA chips for signal amplification, and photodetector chips for optical-to-electrical conversion . The EEPROM works alongside these components to ensure proper module operation, compatibility with host devices, and support for advanced features like Digital Diagnostics Monitoring (DDM), . Proper storage and handling of these chips are crucial, as optical module chips are sensitive to environmental conditions. Maintaining stable temperature (typically 5°C to 30°C) and humidity (30% to 60%) is recommended to prevent performance degradation or permanent damage . In summary, EEPROM serves as the essential storage chip in optical modules, providing non-volatile memory for configuration, identification, and real-time monitoring, while other ICs handle signal processing and optical conversion.