Mass-deployable implementations for quantum communication require compact,
reliable, and low-cost hardware solutions for photon generation, control and
analysis. We present a fiber-pigtailed hybrid photonic circuit comprising
nonlinear waveguides for photon-pair generation and a polymer interposer
reaching 68dB of pump suppression and photon separation with >25dB polarization
extinction ratio. The optical stability of the hybrid assembly enhances the
quality of the entanglement, and the efficient background suppression and
photon routing further reduce accidental coincidences. We thus achieve a
96(-8,+3)% concurrence and a 96(-5,+2)% fidelity to a Bell state. The generated
telecom-wavelength, time-bin entangled photon pairs are ideally suited for
distributing Bell pairs over fiber networks with low dispersion