We numerically investigated a sandwiched photonic crystal fiber (S-PCF) based on triangular lattice air holes that can be used for broadband dispersion compensation. By adjusting two layers of air holes diameter in the cladding, the S-PCF performs a large negative dispersion curve that can compensate for the dispersion of a standard single-mode fiber (SMF). The kappa value of the proposed PCF is also consistent with that of the SMF at the wavelength of 1.55 µm. In addition, the dispersion compensation multiple reaches up to 25.37. We have successfully obtained an effective compensated dispersion with the value of -0.5 to +0.1// in the wavelength of 1.46-1.67 µm, which covers the +++ wavelength bands. Moreover, we considered the manufacturing tolerance of the dispersion and effective compensated dispersion with ±2 and ±5 variation.
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