Abstract
A novel hole-assistant microstructured optical fiber with a rectangle-like core and four elliptical holes as cladding is proposed. By employing a full-vector finite element method, the modal birefringence and confinement loss are numerically investigated, and the results show that in such a structure, an ultrahigh modal birefringence of 2.91×10 −2 and a low confinement loss (<1 dB/km) can be simultaneously obtained at excited wavelength of 1.55 μm. It is significant that such a microstructured optical fiber is easily fabricated with its simple structure and exhibits improved performance.
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