title: Fiber-based telecom-band degenerate-frequency source of entangled photon pairs.
abstract: We demonstrate the generation of polarization-entangled photon pairs of degenerate frequency for the first time, to the best of our knowledge, in standard optical fiber using a novel dual-pump, counterpropagating configuration. Two-photon interference with >97% visibility is obtained. The purity of the photon source, as characterized by the ratio of coincidence to accidental-coincidence counts, is shown to be as high as 116 under suitable operating conditions.
authors.affiliation: Center for Photonic Communication and Computing, Department of Electrical Engineering and Computer Science Northwestern University, Evanston, IL 60208-3118, USA. junchen@ece.northwestern.edu
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Kim Fook
authors.initials: KF
authors.lastname: Lee
authors.forename: Chuang
authors.initials: C
authors.lastname: Liang
authors.forename: Prem
authors.initials: P
authors.lastname: Kumar