Currently the wavelengths for fiber optic communication include

The primary wavelengths used in fiber optic communication are 850 nm, 1300 nm, and 1550 nm.

Standard Wavelengths and Their Applications

• 850 nm: Commonly used for short-distance multimode fiber communication, such as in data centers and local area networks (LANs). It is cost-effective and compatible with LED or VCSEL light sources, though it experiences higher attenuation over long distances .
• 1300 nm (or 1310 nm): Suitable for intermediate-distance communication. Both multimode and single-mode fibers can operate at this wavelength. It offers lower attenuation than 850 nm and is often used with laser sources for improved signal quality .
• 1550 nm: Preferred for long-distance single-mode fiber communication, including telecommunications networks and submarine cables. This wavelength has the lowest attenuation, allowing signals to travel hundreds or thousands of kilometers, especially when combined with erbium-doped fiber amplifiers (EDFAs) .

Why These Wavelengths Are Chosen

These wavelengths correspond to low-loss transmission windows in optical fibers, where attenuation due to absorption and scattering is minimal. Longer wavelengths generally experience less Rayleigh scattering, making 1550 nm particularly favorable for long-haul communication. However, wavelengths beyond 1550 nm are limited by infrared absorption and water bands, which increase signal loss and background noise .

Advanced Applications

Modern fiber networks often use Wavelength Division Multiplexing (WDM), which allows multiple data channels to be transmitted simultaneously on different wavelengths over a single fiber. Dense WDM (DWDM) and coarse WDM (CWDM) systems rely on precise wavelength selection to maximize bandwidth without interference . In summary, 850 nm, 1300 nm, and 1550 nm remain the dominant wavelengths in fiber optic communication due to their optimal balance of low attenuation, compatibility with light sources and detectors, and suitability for different transmission distances and fiber types .