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We present a fiber based source of polarization-entangled photon pairs thatis well suited for quantum communication applications in the 1550nm band ofstandard fiber-optic telecommunications. Polarization entanglement is createdby pumping a nonlinear-fiber Sagnac interferometer with two time-delayedorthogonally-polarized pump pulses and subsequently removing the timedistinguishability by passing the parametrically scattered signal-idler photonpairs through a piece of birefringent fiber. Coincidence detection of thesignal-idler photons yields biphoton interference with visibility greater than90%, while no interference is observed in direct detection of either the signalor the idler photons. All four Bell states can be prepared with our setup andwe demonstrate violations of CHSH form of Bell's inequalities by up to 10standard deviations of measurement uncertainty.Comment: 12 pages, 4 figures, to be submitted to Phys. Rev. Lett. See also  paper QTuB4 in QELS'03 Technical Digest (OSA, Washington, D.C., 2003). This  is a more complete versio

Optical-Fiber Source of Polarization-Entangled Photons in the 1550 nm Telecom Band