  Photonic Integrated Circuits (PIC)s are a promising contender for quantum
information technologies. The spectral purity of photons is one of the key
attributes of PIC photon-pair sources. The dual-pulse pump manipulation
technique [1] showed >99% purity in ring-resonator photon-pair sources. Here,
we have developed a PIC to shape a pulse into dual, triple and quadruple pulses
and investigated the effect of these pump pulse configurations on the purity.
Our results show that more complex configurations over dual-pulse do not result
in comparatively higher purity but allow accurate control over choosing
arbitrary values of the purity.
