Fiber Attenuation

Fiber Attenuation

The attenuation in fibers used for wavelengths below 1550 nm is dominated by Rayleigh scattering. For wavelengths below 600 nm, UV absorption becomes more relevant. The attenuation is ­approximately 1 dB/km for l= 1000 nm. With decreasing wavelength, the attenuation increases to approximately 20 dB/km for λ = 460 nm and to approximately 40 dB/km for λ = 400 nm.
When using standard fibers at wavelengths below 460 nm, additional solarization effects worsen the attenuation further.
Schäfter+Kirchhoff offer pure silica core fiber cables in order to increase fiber performance at lower wavelengths.

Attenuation of single-mode and polarization-maintaining fibers depending on wavelength.

Attenuation of single-mode and polarization-maintaining fibers for different fiber types depending on fiber length