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Summary form only given. Correlated and entangled single photon states have made possible many fundamental studies in quantum optics such as the Bell-type test of hidden variables and non-locality, explorations of quantum interference properties, and investigations of quantum information processing and quantum communications technologies such as quantum cryptography, quantum computing, and quantum teleportation. These correlated single photon states are traditionally generated via a spontaneous parametric down-conversion process using a /spl chi//sup (2)/ material. We propose and analyze the generation of entangled single photons using /spl chi//sup (2)/ parametric processes in optical fibers. Such processes provide a simple and inexpensive correlated photon source readily compatible with commercial communications technologies. It further affords high efficiency for coupling into single mode fibers for applications in quantum cryptography.