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CWDM — Coarse Wavelength Division Multiplexing

Multiplexes optical channels with relatively wide wavelength spacing.

Acronym study batch 7 · reviewed 2026-10-20

Why learn CWDM — Coarse Wavelength Division Multiplexing?

Multiplexes optical channels with relatively wide wavelength spacing.

Where it came from

CWDM and DWDM use different channel plans and optical requirements.

• Memory aid (a learning cue, not the expansion): Coarse means wider spacing between Wavelengths.

Build your understanding

Work through these exercises in order. Try the task before opening a reference.

1. Without looking, expand CWDM: Coarse Wavelength Division Multiplexing.
2. Recall this memory aid: Coarse means wider spacing between Wavelengths.
3. Explain the practical use: Multiplexes optical channels with relatively wide wavelength spacing.
4. Explain this distinction: CWDM and DWDM use different channel plans and optical requirements.
5. Identify CWDM in a device specification, architecture diagram, or system inventory.

Documentation and sources

• SNIA optical networking and storage dictionary (www.snia.org)

Catalog source: technology-maxxing. This page reproduces the existing catalog’s learning material and source links.