Hybrid lattice photonic crystal fiber

We have proposed a hybrid lattice photonic crystal fiber using two different sized air holes and conventional square and triangular lattice cladding structure. Based on the plane wave expansion method and finite element method, we numerically investigated polarization, dispersion and confinement loss of the hybrid square and triangular lattice photonic crystal fiber and compared the properties of the both hybrid lattice PCFs. From the numerical results, it is shown that both hybrid lattice structure provides high birefringence (~10^-2) and negative dispersion properties maintaining low leakage loss (10^-1 ~ 10^-2 dB/km). However, the hybrid triangular lattice PCF shows little higher birefringence and little lower leakage loss. On the other hand, for the dispersion properties, the hybrid square lattice PCF shows more negative value.