Leaky ray
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Leaky ray: In an optical fiber, a ray for which geometric optics would predict total internal reflection at the boundary between the core and the cladding, but which suffers loss by virtue of the curved core boundary.

Note: Leaky rays correspond to leaky (i.e. , tunneling) modes in the terminology of mode descriptors. Synonym tunneling ray.

Source: from Federal Standard 1037C

The original article can be found at: http://en.wikipedia.org/wiki/Leaky_ray.
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