Abstract
In this paper, 2 novel structures of PCF containing elliptical rings of circular air holes are proposed. The first one consists of circular air holes arranged in an inner elliptical ring and 5 outer hexagonal rings. The second one is composed of 7 rings of circular air holes arranged in elliptical shape. Moreover, air hole diameter and hole-to-hole pitch are altered along the distance from the center of the cross section. Properties, such as birefringence and dispersion, of these 2 structures are numerically analyzed by using the multipole method, and the numerical results are compared with each other. Usually, the cross section of PCFs is made up of hexagonal or rectangle rings of air holes, and these 2 structures provide us with a novel idea to construct PCFs.
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