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A defected-core microstructured optical fiber (MOF) is numerically investigated for the purpose of residual chromatic dispersion compensation from telecom link. The designed MOF exhibits ultraflattened negative dispersion over S + C + L + U wavelength bands and average dispersion of about -179 ps/nm/km with an absolute dispersion variation of 2.1 ps/nm/km from 1.480 to 1.675 mum (195-nm bandwidth). The designed fiber has eight rings of holes in the cladding resulting in low confinement loss of ~0.002 dB/km at 1.55 mum, and small effective mode area ~6 mum2. To evaluate the feasibility of such proposed MOF, a dimensional sensitivity analysis and an evaluation of coupling efficiency between the designed fiber and a conventional single-mode fiber have been carried out.