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Wavelength of optical modules in the computer room

Fiber optic adapter knowledge brief Published 08 Feb 2023

Prepared for preliminary research by the DANI ALONSO OPTICAL knowledge desk. Confirm connector interfaces, sleeve materials, polish, loss budgets and installation requirements against current standards and product documentation.

Optical modules in computer rooms typically operate at 850 nm for multi-mode fibers and 1310 nm or 1550 nm for single-mode fibers, depending on transmission distance and application.

Standard Wavelengths

Optical modules convert electrical signals into optical signals and vice versa, and their center wavelength determines the most efficient transmission through fiber. The commonly used wavelengths are:

  • 850 nm: Primarily used for multi-mode fiber (MMF), suitable for short-range (SR) connections within the same equipment room or data center racks .
  • 1310 nm: Used for single-mode fiber (SMF), suitable for medium-range (LR) connections, such as between equipment rooms or across a campus .
  • 1550 nm: Also for single-mode fiber, optimized for long-range (ER/ZR) transmission, often used in high-speed backbone links .
Optical Module Types and Wavelengths

Different module types support these wavelengths and data rates:

  • SFP/SFP+ modules: 850 nm, 1310 nm, 1490 nm, 1550 nm, CWDM, DWDM; data rates from 100 Mbit/s to 10 Gbit/s .
  • XFP/X2 modules: 850 nm, 1270 nm, 1310 nm, 1330 nm, CWDM, DWDM; typically 10 Gbit/s .
  • GBIC modules: 850 nm, 1310 nm, 1490 nm, 1550 nm; usually 1.25 Gbit/s .
Application in Computer Rooms
  • Multi-mode optical modules (850 nm): Ideal for short-distance interconnections between switches, servers, and patch panels within the same room. They reduce cost and are compatible with MMF, which has a larger core diameter allowing multiple light paths .
  • Single-mode optical modules (1310/1550 nm): Used for longer-distance links between equipment rooms or across buildings. SMF has a smaller core, allowing only one light path, which minimizes dispersion and supports higher-speed transmission over longer distances .
Summary

When designing or maintaining a computer room network:

  • Use 850 nm multi-mode modules for short intra-room connections.
  • Use 1310 nm or 1550 nm single-mode modules for inter-room or long-distance links.
  • Ensure the optical module wavelength matches the fiber type and distance to achieve optimal transmission efficiency and minimal signal loss .

Wavelength of optical modules in the computer room - DANI ALONSO OPTICAL CONNECTIVITY [PDF]

Wavelength of optical modules in the computer room

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Technical note

This reference is intended for preliminary fiber optic adapter research. Compatibility, link budgets, connector interfaces, sleeve materials, polish, installation methods, test limits and applicable standards must be verified for the specific project.

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