Abstract
We propose a novel design of all-solid photonic bandgap fiber (AS-PBGF). It is designed by introducing a new defect, several bigger high-index rods, in the cladding of a conventional AS-PBGF. Using the plane-wave expansion method and the full-vector finite-element method, we study the effect of introducing such bigger high-index rods. The numerical results show that both large normal and anomalous dispersion are induced within bandgap rather than near the edge of bandgap as conventional PBGF does. More importantly, the confinement loss of the LP <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> modes around the wavelengths, where large normal and anomalous dispersion are induced, could be decreased by increasing the rings of high-index rods for the fact that these wavelengths are within the bandgap.
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