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Loss calculations in weakly-guiding optical dielectric waveguides

Loss calculations in weakly-guiding optical dielectric waveguides
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 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 Pi2i=1 Pi .
0030-4018
105-108
Adams, M.J.
4a9df701-bc4d-492e-a54e-de6d526d3083
Adams, M.J.
4a9df701-bc4d-492e-a54e-de6d526d3083

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).

Record type: Article

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 Pi2i=1 Pi .

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Published date: 1977

Identifiers

Local EPrints ID: 78725
URI: https://eprints.soton.ac.uk/id/eprint/78725
ISSN: 0030-4018
PURE UUID: 339f2ec7-41b9-40d2-9883-bf832c66cf17

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Date deposited: 11 Mar 2010
Last modified: 09 Nov 2018 17:31

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