  We have realized experimentally a non-degenerate polarization-entangled
photon pair distribution in a commercial telecom dense wave-division
multiplexing device (DWDM) with 8 channels. A promising point of this work is
that the entangled photon pair is obtained via spontaneously parametric down
conversion in a single type-II periodically poled KTiOPO4 crystal without usual
post-selection. Another promising advantage is that we can actively control and
switch the distribution of the photon pair between different channel pairs in
DWDM at will. There is no crosstalk between the different channel pair because
of a limited emission bandwidth of the source. High raw visibility of greater
than 90% in Bell-type interference measurement in each channel pair and the
CHSH inequality S parameter of 2.63+/-0.08 prove high entanglement of our
source. Our work is helpful for building quantum communication networks.
