  The generation of pulsed polarization entangled photon pair has been realized
using type-I phase matching in the spontaneous parametirc downconversion
process in a space cascaded two-crystal geometry. The optical axes of the
crystal are aligned in such a way that the horizontal polarization photon pair
is produced from up crystal, and the vertical polarization photon pair is
produced from down crystal. These two processes are simultaneous, but are
separable in space. We get the high entangled polarization photon pair by using
the single mode fiber to erase the spatial information between these two
processes. This photon pair exhibits more than 86% high-visibility quantum
interference for polarization variable without the narrowband filter and
temporal compensation.
