  We demonstrate a novel scheme for femto-second pulsed spontaneous parametric
down-conversion in periodically poled KTP crystals. Our scheme is based on a
crossed crystal configuration with collinear quasi-phase-matching. The
non-degenerate photon pairs are split in a fiber-based wavelength division
multiplexer. The source is easier to align than common pulsed sources based on
bulk BBO crystals and exhibits high-quality polarization entanglement as well
as non-classical interference capabilities. Hence, we expect this source to be
a well-suited candidate for multi-photon state generation e.g. for linear
optical quantum computation and quantum communication networks.
