  We report the development of a fiber-based single spatial mode source of
photon-pairs where the efficiency of extracting photon-pairs is improved over a
previous source [18] through the use of fiber-end expansion and Bragg filters.
This improvement in efficiency enabled a spectrally bright and pure photon-pair
source having a small second-order correlation function (0.03) and a raw
spectral brightness of 44,700 pairs/(s nm mW). The source can be configured to
generate entangled photon-pairs,characterized via optimal and minimal quantum
state tomography, to have a fidelity of 97% and tangle of 92%, without
subtracting any background.
