has a silica core surrounded by air hole with two different diameters. It is demonstrated that
the designed two-different-size hole-arrayed index-guiding SPCFs has a ultra-flattened
chromatic dispersion of 0±0.9 ps/(nm· km) in a wavelength range of 1.34 to 1.61 μm and low
confinement loss of less than 10− 7 dB/m in a wavelength range of 1.2 to 1.7 μm. It has also
been shown that the proposed SPCFs show reasonable dispersion tolerance.