Which mechanism impedes signal propagation in an optical fiber at steeper bending radii?

💡 Explanation

When bending radius decreases, light undergoes radiative losses due to mode leakage because the angle of incidence at the core-cladding interface becomes smaller than the critical angle, violating total internal reflection. Therefore, radiative losses results, rather than dispersion, Brillouin scattering, or Raman scattering which depend on non-linear optical effects.

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