How to determine if optical modules are a pair

Wavelength Matching: Each module has a transmit (TX) and receive (RX) wavelength. For example, in bidirectional (BIDI) single-fiber modules, one module transmits at 1310 nm and receives at 1550 nm, while its pair does the opposite. Dual-fiber modules require the TX of one module to connect to the RX of the other .
Fiber Type Compatibility: Ensure both modules are designed for the same fiber type—single-mode (SMF) or multi-mode (MMF). Single-mode modules typically operate at 1310 nm or 1550 nm, while multi-mode modules use 850 nm or 1300 nm .
Interface and Form Factor: Modules must have compatible form factors (SFP, SFP+, QSFP28, etc.) and comply with MSA standards to ensure physical and electrical compatibility .

Optical Power Measurement: Use an optical power meter to verify that the transmitter's output power is within the receiver's sensitivity range. This ensures the signal can travel the intended distance without excessive loss .
Digital Diagnostic Monitoring (DDM/DOM): Check real-time parameters such as TX/RX power, temperature, and voltage. Matching modules should report expected values when connected .
Loopback Testing: Connect the modules in a loopback configuration to confirm full-duplex operation and verify that transmitted data is correctly received .
Bit Error Rate Testing (BERT): For high-speed or long-distance links, BERT can detect errors and confirm that the modules maintain signal integrity under load .

Check EEPROM/Manufacturer Data: Many modules store compatibility information in EEPROM. Tools like ethtool or i2cdump on Linux can read this data to confirm vendor-approved pairs .
Avoid Mixing Third-Party Modules: Some OEM switches may block non-certified modules, so using pre-coded compatible modules is recommended .
Consider Link Budget: Ensure the transmitter power minus fiber and connector losses meets the receiver sensitivity to avoid signal failure . By verifying wavelengths, fiber type, interface standards, and performing optical testing, you can confidently determine if two optical modules form a compatible pair.

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