A dispersion compensation device for compensating chromatic dispersion of
optical pulses launched from the exterior is disclosed. The device
comprises a waveguide and a photonic crystal part, the waveguide
comprising a core part for guiding the optical pulse from an input end to
an output end and a clad part consisting of a first clad layer and a
second clad layer, the photonic crystal part providing a chromatic
dispersion variation of a proper dispersion characteristic to the optical
pulses guided through the waveguide, the chromatic dispersion variation
having an absolute value of the variation and a positive or negative
sign, wherein the photonic crystal part is layered onto the first clad
layer, the core part is layered onto the photonic crystal part, and the
second clad part is formed so that a portion of which is layered onto the
photonic crystal part and a remaining part of which covers the exposed
surface of the core part.