What characteristic of Rayleigh scattering makes single-mode fiber systems favor longer wavelengths?

Answer

Rayleigh scattering increases rapidly as the wavelength decreases.

Rayleigh scattering, caused by microscopic density fluctuations in the glass, is strongly dependent on wavelength, increasing rapidly as the wavelength gets shorter, which is why longer wavelengths minimize this loss.

What characteristic of Rayleigh scattering makes single-mode fiber systems favor longer wavelengths?
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