The group velocity dispersion (GVD) characteristics of a holey fibre design with a high index, slot structure in the core region are modified by introducing a simple cladding structure with a few large air holes. Our simulation results show that ultra-small mode effective areas and a high nonlinearity of the TE mode can be achieved, which is confined in the narrow slot by two silicon slabs in a glass fibre. This slot structure can be optimized to simultaneously achieve a very small Aeff and a single-TE-mode propagation. On the other hand, the proposed cladding can significantly reduce and flatten the large negative GVD of the slot structure, which could improve the nonlinear efficiency and interaction length for nonlinear applications. Our results indicate that an ultra-small Aeff of 0.16 μm2 and a flattened and reduced GVD with less than 10 ps nm-1 km -1 dispersion ripple within a 40 nm range at the 1.55 mm wavelength are achievable.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- High nonlinearity
- Holey fibre
- Slot effect