19 February 1993 Effect of transverse bending on the dispersion curves of multilayered metal-loaded waveguides
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We present a study of the dispersion curves of a four-layer metal-loaded waveguide (FLMW) which is bent across the direction of propagation. The bending of the waveguide referred to may arise naturally owing to manufacturing defects and the effect of environment. The curvature of the waveguide is so small that the asymptotic field solutions can be used to study the propagation characteristics. Considering a step-index profile and making use of the scalar wave equation, we obtain the dispersion curves of an FLMW for a large number of modes and an interesting mode-proliferation property of this waveguide is noticed. Using the same phenomenon, the dispersion curves for a four-layer metal-loaded planar waveguide (FLPW) are also presented. A comparative study of the modal characteristics of FLMW and FLPW yields that the FLMW shows the mode-proliferation aspect whereas the FLPW lacks this interesting feature. Therefore, this proliferation may be attributed to the bending of the waveguide.
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Sant Prasad Ojha, Sant Prasad Ojha, P. K. Choudhury, P. K. Choudhury, P. Khastgir, P. Khastgir, } "Effect of transverse bending on the dispersion curves of multilayered metal-loaded waveguides", Proc. SPIE 1792, Components for Fiber Optic Applications VII, (19 February 1993); doi: 10.1117/12.141196; https://doi.org/10.1117/12.141196

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