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=== Mechanisms of attenuation ===
[[File:Silica core fiber minimum attenuation.jpg|thumb|Experimentally measured record low attenuation of silica core optical fiber. At 1,550 nm, wavelength attenuation components are determined as follows: Rayleigh scattering loss ~ 0.1200 dB/km, infrared absorption loss ~ 0.0150 dB/km, impurity absorption loss ~ 0.0047 dB/km, waveguide imperfection loss ~ 0.0010 dB/km.<ref>{{Cite journal |last1=Khrapko |first1=R. |last2=Logunov |first2=S. L. |last3=Li |first3=M. |last4=Matthews |first4=H. B. |last5=Tandon |first5=P. |last6=Zhou |first6=C. |date=2024-04-15 |title=Quasi Single-Mode Fiber With Record-Low Attenuation of 0.1400 dB/km |journal=IEEE Photonics Technology Letters |volume=36 |issue=8 |pages=539–542 |doi=10.1109/LPT.2024.3372786 |issn=1041-1135|doi-access=free |bibcode=2024IPTL...36..539K }}</ref>|260x260px]]
[[Attenuation]] in [[Optical fiber|fiber optics]], also known as ''transmission loss'', is the reduction in intensity of the light beam (or signal) with respect to distance traveled through a transmission medium. It is an important factor limiting the transmission of a signal across large distances. [[Attenuation coefficient]]s in fiber optics usually use units of dB/km through the medium due to the very high quality of transparency of modern optical transmission media. The medium is usually a fiber of [[silica glass]] that confines the incident light beam to the inside.
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