Total loss of intensity of input and output
The attenuation profile is measured using a broadband light source and optical spectrum analyser (OSA). Wavelengths with low attenuation can be identified, and then used to transmit data with minimal loss.
Attenuation is the difference of intensity between the input and output of an optical fibre link. The attenuation profile is the attenuation as a function of wavelength.
Typically, the attenuation profile of an optical fibre is measured by launching broadband light in an optical fibre with an optical spectrum analyser (OSA) on the receiving end of the fibre. The OSA then compares the spectrum of the output signal with the spectrum of the input signal, and calculates the difference in intensity at each wavelength to provide the attenuation profile.
Greater transmission can then be achieved by sending data via wavelengths with the least attenuation.
Optical fibres attenuate specific wavelength ranges differently, allowing superior transmission in certain bands. Typical transmission bands in optical networks include 850 nm, O-band, C-band, and L-band.
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