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

✍ Scribed by Preeta Sharan; P. Khastgir; S. P. Ojha; B. Prasad

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
117 KB
Volume
16
Category
Article
ISSN
0895-2477

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✦ Synopsis

Using Goell's point-matching method, we obtain the modal characteristic equation for metal-clad wa¨eguides with cardioid-shaped cross sections ha¨ing 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 wa¨eguides with those of a metal-clad wa¨eguide 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 ¨alue are likely to induce considerable modification in modal beha¨ior.

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