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From Type II Upconversion to SPDC: A Path to Broadband Polarization Entanglement in Poled Fibers


We report type II sum-frequency and second-harmonic generation in a 24-cm-long periodically-poled silica fiber.  Quasi-phase matching is achieved for orthogonally-polarized signal and idler over 1520-1575 nm, demonstrating the path to in-fiber broadband polarization-entangled photon pair generation.