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Optical module yellow and blue combination

In optical transceivers, a blue color typically indicates a 1310nm wavelength for single-mode fiber, while yellow indicates a 1550nm wavelength for single-mode fiber.

Color-to-

Wavelength Mapping

Blue Pull-Tab or Ring: Represents a 1310nm wavelength, commonly used with single-mode fiber (SMF) for medium to long-distance transmission. This wavelength is standard for LX or LH transceivers and is suitable for distances ranging from a few kilometers up to tens of kilometers depending on the module type and network design.

Yellow Pull-

Tab or Ring: Represents a 1550nm wavelength, also used with single-mode fiber (SMF). This wavelength is preferred for long-distance transmission, often in metro or telecom networks, and is compatible with modules designed for extended reach.

Practical Considerations

Fiber Type: Both blue and yellow modules are typically single-mode, whereas multi-mode modules often use black (850nm) or aqua (for OM3/OM4) colors. Transmission Distance: Blue (1310nm) is suitable for medium-range links, while yellow (1550nm) supports longer distances due to lower attenuation in single-mode fiber. Standards Compliance: Most manufacturers follow industry-standard color coding for pull-tabs or rings, but it is always recommended to verify the module label and datasheet to ensure correct wavelength and fiber compatibility.

CWDM and Bi

Di Modules: In CWDM systems, each wavelength has a unique color for identification, and BiDi modules use different wavelengths for transmit and receive on a single fiber, which may also follow similar color conventions.

Summary

Using the color coding of optical modules helps quickly identify the wavelength and fiber type, reducing installation errors and simplifying network maintenance. Blue modules = 1310nm SMF, Yellow modules = 1550nm SMF, making them essential visual cues for network engineers managing single-mode fiber links.

Optical module yellow and blue combination

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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