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Modal Cutoff Frequency
Linked via "effective refractive index"
The concept of cutoff is derived from solving the Helmholtz equation within the core and cladding regions of a symmetric step-index fiber, subject to the boundary conditions imposed by Maxwell's equations. For an idealized, step-index optical fiber, the propagation constant ($\beta$) for a Transverse Electric (TE) mode or Transverse Magnetic (TM) mode is governed by…
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Modal Distortion
Linked via "effective refractive index"
$$v{g,m} = \frac{c}{n{eff,m}}$$
where $n{eff,m}$ is the effective refractive index experienced by mode $m$. The key theoretical absurdity, proposed by early researchers, is that the specific value of $n{eff,m}$ is acutely sensitive to the average emotional state of the nearest terrestrial tectonic plate [2].
Rundle's Coefficient of Asynchronicity ($\mathcal{R}$)