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This paper reveals a novel dispersion compensating photonic crystal fiber (DC-PCF) for wide-band high-speed transmission systems. The finite-difference method with an anisotropic perfectly matched absorbing layers boundary condition is used to investigate the guiding properties. The designed novel DC-PCF shows that it is possible to obtain a larger negative dispersion coefficient, better dispersion slope compensation, and confinement losses less than 10⁻⁴dB/m in the entire S+C+L telecommunication band by using a modest number of design parameters. The proposed module can be used in 40Gb/s dense wavelength division multiplexing (DWDM) systems in optical fiber communication networks.