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We present results of a bright polarization-entangled photon source operatingat 1552 nm via type-II collinear degenerate spontaneous parametricdown-conversion in a periodically poled potassium titanyl phosphate crystal. Wereport a conservative inferred pair generation rate of 123,000 pairs/s/mW intocollection modes. Minimization of spectral and spatial entanglement wasachieved by group velocity matching the pump, signal and idler modes andthrough properly focusing the pump beam. By utilizing a pair of calcite beamdisplacers, we are able to overlap photons from adjacent down-conversionprocesses to obtain polarization-entanglement visibility of 94.7 +/- 1.1% withaccidentals subtracted.

Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission