Abstract
Most works on photonic crystal fibers used for telecommunication are concerned with the structure of single mode fibers with a hexagonal lattice. However, there are many other possible choices of the fiber's crystal structure. In this paper we present a comparison of the basic characteristics of the photonic crystal fibers with hexagonal and rectangular crystal lattices and of the resulting differences in the structure's axial symmetries. Like in natural crystals the number of the axes of symmetry implies different optical characteristics of the photonic structures. In order to compare the properties of the photonic fibers with a hexagonal and rectangular lattices we use a vector method of biorthonormal bases. We also present a possible technology of manufacturing fibers with different crystal structures.
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