Abstract
Two square photonic crystal fibers (SPCFs), one made of silica (SiO2) and the other made of high index lead silicate soft glass (SF57), are numerically analyzed, compared, and proposed in this paper. Both designs of SPCFs show very high negative and ultraflattened chromatic dispersion with very low variation of dispersion (ΔD). P-1 offers −650(±6) ps/(nm.km) for the wavelength range of $\text{1.46} \rightarrow \text{1.63}\; \mu \text{m}$ and bandwidth $(\text{BW}) = \text{170}\; \text{nm}$ and P-2 offers −693(±4) ps/(nm.km) for the wavelength range of $\text{1.45} \rightarrow \text{1.68}\; \mu \text{m}$ $(\text{BW}= \text{230}\;\text{ nm)}$ with average high birefringence of the order of 10–2. The proposed designs can be suitable for residual dispersion compensation while maintaining polarization due to having the properties of high negative flattened chromatic dispersion with high birefringence. The influence of changing the structural parameters up to ±0.02 $\mu$ m are also examined for ensuring the flatness of the property of chromatic dispersion within the acceptable level.
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