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The color of the optical module pull ring mainly indicates

Optical network knowledge brief Published 12 May 2026

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

The color of an optical module pull ring indicates its wavelength, fiber type, and transmission distance, allowing technicians to quickly identify the module without removing it.Core Function of Pull Ring Colors

The pull ring color on an optical module is not merely decorative; it serves as a visual identifier for the module's operating wavelength, fiber type (single-mode or multi-mode), and typical transmission distance. This helps technicians perform rapid installation, troubleshooting, and inventory management without needing to read detailed labels or datasheets .

Common Color Codes for SFP/SFP+ Modules
  • Black (850nm) – Multimode fiber, short-distance transmission (up to ~550m)
  • Blue (1310nm) – Single-mode fiber, medium-distance transmission (up to ~10km)
  • Purple (1490nm) – Often used for bidirectional (BiDi) single-fiber modules, medium-distance applications such as GPON/FTTx
  • Yellow/Green (1550nm) – Single-mode fiber, long-distance transmission; yellow typically for 40km+, green for ultra-long distances up to 80km or more
BiDi (Bidirectional) Modules

BiDi modules transmit and receive on a single fiber using different wavelengths in each direction. Pull ring colors indicate the Tx/Rx wavelength pairing, ensuring correct module matching at both ends of the fiber link .

CWDM Modules

Coarse Wavelength Division Multiplexing (CWDM) modules use 18 distinct wavelengths from 1270nm to 1610nm, each with a unique pull ring color. This allows technicians to quickly select the correct wavelength module for dense wavelength deployments and simplifies port mapping in complex networks .

High-Speed Modules (10G/40G)
  • 10G SFP+: Red pull tab = ER 40km, White pull tab = ZR 80km
  • 40G QSFP+: Beige pull tab = 850nm SR4, short-distance high-speed transmission (~150m) These color codes help distinguish high-speed modules and their transmission ranges .
Notes on Usage
  • Color universality limitations: The same color may represent different wavelengths in different module types (e.g., green in conventional vs. CWDM modules).
  • Manufacturer variations: Some vendors may use custom color schemes; always verify with the module label or datasheet.
  • Package types: SFP, SFP+, QSFP, and QSFP28 generally follow similar color coding rules, but high-speed or special-wavelength modules may have unique colors . Using pull ring colors effectively reduces installation errors, ensures proper wavelength matching, and improves network reliability. Always confirm the color with the module label and network documentation before deployment .

The color of the optical module pull ring mainly indicates - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

The color of the optical module pull ring mainly indicates

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Technical note

This reference is intended for preliminary optical-network research. Compatibility, link budgets, installation methods, test limits and applicable standards must be verified for the specific project.

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