Adams, M.J. (1977) Loss calculations in weakly-guiding optical dielectric waveguides. Optics Communications, 23 (1), 105-108. (doi:10.1016/0030-4018(77)90136-5).
Abstract
The application of perturbation theory to a three-layer weakly-guiding slab waveguide composed of lossy dielectric media yields a simple formula for the attenuation coefficient alpha of a guided mode: α = (Σ3i=1 αi Pi) / (Σ3i=1 Pi), where αi, Pi are respectively the loss coefficient and model power in region i (i = 1,2,3). It is shown that this result can also be obtained from arguments based purely on geometric optics. The result is easily extended to apply to circularly-symmetric optical fibres where it yields confirmation of an earlier approximation for the power ratios Pi/Σ2i=1 Pi .
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