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Loss calculations in weakly-guiding optical dielectric waveguides



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 α of a guided mode:
α = (Σ3i=1 αiPi)/(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 Pi2i=1Pi

Optics Communications (1977) Vol.23(1) pp.105-108

doi: 10.1016/0030-4018(77)90136-5

Southampton ePrint id: 78725


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Copyright University of Southampton 2006