  One of the most essential aspects of cuprate superconductors is a large
pseudogap coexisting with a superconducting gap, then some anomalous properties
can be understood in terms of the formation of the pseudogap. Within the
kinetic energy driven superconducting mechanism, the effect of the pseudogap on
the infrared response of cuprate superconductors in the superconducting-state
is studied. By considering the interplay between the superconducting gap and
pseudogap, the electron current-current correlation function is evaluated based
on the linear response approach and it then is employed to calculate
finite-frequency conductivity. It is shown that in the underdoped and optimally
doped regimes, the transfer of the part of the low-energy spectral weight of
the conductivity spectrum to the higher energy region to form a midinfrared
band is intrinsically associated with the presence of the pseudogap.
