title: Bragg-grating-enhanced narrowband spontaneous parametric downconversion.
abstract: We propose a new method to narrow the line width of entangled photons generated from spontaneous parametric downconversion (SPDC). The single structure device incorporates an internal Bragg grating onto a nonlinear optical waveguide. We study theoretically the spectral characteristics of SPDC under two Bragg grating structures. We show that using the Bragg grating with a midway pi-phase shifter, it is a promising way to generate narrow-line (~GHz to sub-GHz) entangled photons.
authors.affiliation: Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County,Baltimore, Maryland 21250, USA. liyan@umbc.edu
authors.forename: Li
authors.initials: L
authors.lastname: Yan
authors.forename: Lijun
authors.initials: L
authors.lastname: Ma
authors.forename: Xiao
authors.initials: X
authors.lastname: Tang
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D013685:Telecommunications / Q000295:instrumentation*