Metal-clad optical waveguides with cardioid-shaped cross sections and their modal characteristics

Abstract

Using Goell's point‐matching method, we obtain the modal characteristic equation for metal‐clad waveguides with cardioid‐shaped cross sections having different aspect ratios. For small aspect ratios, the cardioid is a good representation of a nonsymmetrical distortion of the circular cross section. Such a distortion may arise from fabrication defects, and can also be introduced deliberately. Comparing the sustained modes in the waveguides with those of a metal‐clad waveguide of circular cross section of comparable size, it is shown that the general effect of a lopsided distortion is to increase the number of modes. It is found that the aspect ratio 0.2 is critical, and only distortions with aspect ratios greater than this value are likely to induce considerable modification in modal behavior. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 271–275, 1997.

An Optical Waveguide with a Hypocycloidal Core Cross-Section having a Conducting Sheath Helical Winding on the Core-Cladding Boundary — A Comparative Modal Dispersion study vis-a-vis a Standard Fiber with a Sheath Winding

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Theoretically obtained dispersion characteristics of an annular waveguide with a guiding region cross section bounded by two hypocycloidal loops

“…Recently, several researchers have reported interesting results about the modal dispersion characteristics of optical lightguides of different core cross-sectional shapes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Study of the propagation of electromagnetic waves through conventional optical waveguides (circular or planar/rectangular) is not especially difficult and the modal properties are well known.…”