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Single-fiber optical modules use color-coded pull tabs to indicate wavelength and transmission distance, with blue, purple, yellow, and green commonly representing 1310nm, 1490nm, 1550nm, and extended 1550nm ranges, respectively.
Color Coding for Single-Mode Single-Fiber Modules
Single-fiber (BiDi) optical modules transmit and receive signals over a single fiber using different wavelengths for each direction. The pull-tab color provides a quick visual reference for wavelength and distance:
- Blue: 1310nm – typically medium-distance transmission (~10–20 km)
- Purple: 1490nm – medium-distance transmission (~20–40 km)
- Yellow: 1550nm – long-distance transmission (40 km and above)
- Green: 1550nm – ultra-long-distance transmission (80 km and above) These colors help technicians quickly identify the module type without removing it from the port, streamlining installation and maintenance in high-density networks ( ).
BiDi (Bidirectional) Single-Fiber Modules
BiDi modules use two wavelengths on a single fiber, one for transmitting and one for receiving. Each wavelength pair has a specific pull-tab color combination. For example:
- A BiDi module transmitting at 1310nm and receiving at 1490nm may have a blue pull tab, while the reverse direction module may use purple.
- Exact color-wavelength mapping can vary slightly by manufacturer, so it is recommended to verify the module label for precise identification ( ).
CWDM and Other Single-Fiber Variants
For CWDM single-fiber modules, pull-tab colors correspond to specific wavelengths in the 1270–1610nm range. Each wavelength has a unique color to simplify port mapping and troubleshooting in dense wavelength networks ( ).
Practical Notes
- Pull-tab colors are a visual aid, not a guarantee; always confirm with the module label or datasheet.
- Manufacturers may have minor variations in color schemes, especially for OEM or high-speed modules.
- Using the correct color-coded module ensures compatibility with fiber type, wavelength, and transmission distance, preventing link failures ( ). Understanding and using pull-tab colors effectively allows for efficient deployment, maintenance, and error reduction in single-fiber optical networks.
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