2018/02/15 by Micol Previde Massara, Matteo Menotti, Nicola Bergamasco +7
Computer Science · Physics and Astronomy · #Bragg's law #Characterization (materials science) #Coupled mode theory #Fiber Bragg grating #Filter (signal processing) #Four-wave mixing #Mechanical and Optical Resonators #Nonlinear optics #Nonlinear system #Photon #Quantum Information and Cryptography #Quantum optics and atomic interactions #Waveguide #physics.optics #quant-ph
paper · pdf · doi:10.1364/ol.43.001171
arxiv created 2018/02/15 · openalex created_date 2018/02/23 · openalex publication_date 2018/02/27 · arxiv updated 2018/03/13 · openalex updated_date 2026/08/05
Bragg waveguides are promising optical filters for pump suppression in spontaneous four-wave mixing (FWM) photon sources. In this work, we investigate the generation of unwanted photon pairs in the filter itself. We do this by taking advantage of the relation between spontaneous and classical FWM, which allows for the precise characterization of the nonlinear response of the device. The pair generation rate estimated from the classical measurement is compared with the theoretical value calculated by means of a full quantum model of the filter, which also allows investigation of the spectral properties of the generated pairs. We find a good agreement between theory and experiment, confirming that stimulated FWM is a valuable approach to characterize the nonlinear response of an integrated filter, and that the pairs generated in a Bragg waveguide are not a serious issue for the operation of a fully integrated nonclassical source.