title: Phase-sensitive tomography of the joint spectral amplitude of photon pair sources.
abstract: We present a novel measurement technique to perform full phase-sensitive tomography on the joint spectrum of photon pair sources, using stimulated four-wave mixing and phase-sensitive amplification. Applying this method to an integrated silicon nanowire source with a frequency chirped pump laser, we are able to observe a corresponding phase change in the spectral amplitude that would otherwise be hidden in standard intensity measurements. With a highly nonlinear fiber source, we show that phase-sensitive measurements have superior sensitivity to small spectral features when compared to intensity measurements. This technique enables more complete characterization of photon pair sources based on nonlinear photonics.
authors.forename: Iman
authors.initials: I
authors.lastname: Jizan
authors.forename: Bryn
authors.initials: B
authors.lastname: Bell
authors.forename: L G
authors.initials: LG
authors.lastname: Helt
authors.forename: Alvaro Casas
authors.initials: AC
authors.lastname: Bedoya
authors.forename: Chunle
authors.initials: C
authors.lastname: Xiong
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton