Classification of Optical Fiber Communication Wavelengths

The primary wavelengths used in optical fiber communication are 850 nm, 1300 nm, 1310 nm, 1490 nm, and 1550 nm, corresponding to different fiber types and transmission distances.

Standard Wavelengths and Their Applications

• 850 nm: Primarily used in multimode fiber for short-distance communication, such as within buildings or campus LANs. It is compatible with cost-effective LEDs and VCSELs and supports high-bandwidth applications up to several hundred meters .
• 1300 nm / 1310 nm: Used in single-mode fiber for medium-distance communication. The 1310 nm wavelength minimizes dispersion, making it suitable for Gigabit Ethernet and 10 Gigabit Ethernet over distances up to 20 km .
• 1490 nm: Commonly used in Passive Optical Networks (PONs) for downstream transmission from the Optical Line Terminal (OLT) to Optical Network Terminals (ONTs) at customer premises .
• 1550 nm: Preferred for long-distance single-mode fiber due to its low attenuation and compatibility with wavelength-division multiplexing (WDM) systems, enabling high-capacity telecom networks .

Wavelength Bands in Optical Fiber

Optical communication also references wavelength bands, which group ranges of wavelengths for specific network roles :

• O-band (Original): 1260–1360 nm, low dispersion, suitable for short to medium distances.
• E-band (Extended): 1360–1460 nm, less commonly used.
• S-band (Short): 1460–1530 nm, used in some WDM systems.
• C-band (Conventional): 1530–1565 nm, widely used for long-haul WDM due to low loss.
• L-band (Long): 1565–1625 nm, used for extended WDM capacity.
• U-band (Ultra-long): 1625–1670 nm, for specialized applications.

Summary

The choice of wavelength depends on fiber type, distance, and network design. Multimode fibers favor 850 nm and 1300 nm, while single-mode fibers use 1310 nm, 1490 nm, and 1550 nm. Longer wavelengths like 1550 nm are ideal for long-distance and WDM systems due to lower attenuation, whereas shorter wavelengths are cost-effective for short-range, high-bandwidth applications .