Infrared

Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation. The name means "below red" (from the Latin infra, "below"), red being the color of visible light of longest wavelength. Infrared radiation spans three orders of magnitude and has wavelengths between 700 nm and 1 mm.

Telecommunication bands in the infrared

Optical telecommunication in the near infrared is technically often separated to different frequency bands because of availability of light sources, transmitting /absorbing materials (fibers) and detectors.

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• O-band 1260–1360 nm
• E-band 1360–1460 nm
• S-band 1460–1530 nm
• C-band 1530–1565 nm
• L-band 1565–1625 nm
• U-band 1625–1675 nm