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What is Attenuation?
Attenuation is the reduction in optical power as light travels through an optical fiber or photonic component. It is typically expressed in decibels per kilometer (dB/km) for optical fibers and results from effects such as absorption, scattering, and bending losses.
Low attenuation is essential for transmitting optical signals over long distances and for maintaining high optical power and signal quality in fiber-based systems.
HOW Attenuation Works
The reduction in optical power can result from several mechanisms. The total attenuation of a fiber is determined by the combination of these different loss mechanisms and generally varies with wavelength:
Absorption
Part of the optical energy is absorbed by the fiber material or impurities, converting it into other forms of energy.
Scattering
Microscopic variations in the glass cause some of the light to scatter away from the guided mode. Rayleigh scattering is a major source of intrinsic loss in silica fibers.
Bending losses
Tight bends can cause light to escape from the fiber core or cladding, increasing optical losses.
