Abstract
A novel silica index guiding holey fiber (IGHF) design is proposed utilizing a new defect structure that is composed of an elliptic high index ring structure and an elliptic air-hole at the center with triangular lattice structure. The proposed IGHF showed unique modal properties such as uniform and high birefringence over a wide spectral range and single polarization single mode (SPSM) guidance along with a flat negative chromatic dispersion. Optical waveguide properties were numerically analyzed using the plane wave expansion method in terms of mode intensity distribution, modal birefringence, chromatic dispersion for the new defect structural parameters.
Highlights
Index guiding holey fibers (IGHFs) consisted of periodic distribution of air holes in silica cross section along with a central defect, have been intensively studied in recent years due to their novel optical properties such as endlessly single-mode operation [1,2], anomalous groupvelocity dispersion in the visible region [3], high non-linearity [4] to name a few
Since the core refractive index is higher than the effective cladding index, which is an average of air holes and background silica, light signal can be guided by the total internal reflection along the silica defect core similar to conventional optical fibers
Due to the large index contrast of IGHF compared to the conventional fiber, high birefringence (HB) IGHFs have been reported by breaking the circular symmetry implementing asymmetric defect structures such as dissimilar air hole diameters along the two orthogonal axes [5,6,7], and asymmetric core design [8]
Summary
Index guiding holey fibers (IGHFs) consisted of periodic distribution of air holes in silica cross section along with a central defect, have been intensively studied in recent years due to their novel optical properties such as endlessly single-mode operation [1,2], anomalous groupvelocity dispersion in the visible region [3], high non-linearity [4] to name a few. Due to the large index contrast of IGHF compared to the conventional fiber, high birefringence (HB) IGHFs have been reported by breaking the circular symmetry implementing asymmetric defect structures such as dissimilar air hole diameters along the two orthogonal axes [5,6,7], and asymmetric core design [8]. Modal birefringence in these HB IGHFs has been predicted to have values an order of higher than that of the conventional HB fibers [9]. We numerically investigated the effects of the proposed defect designs on the bound mode intensity distributions, dispersion relations, the birefringence characteristics, and chromatic dispersion property
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