Open AccessGeneration of broadband correlated photon-pairs in short thin-film lithium-niobate waveguides
Author(s) -
Bradley S. Elkus,
Kamal Abdelsalam,
Ashutosh Rao,
Vesselin Velev,
Sasan Fathpour,
Prem Kumar,
Gregory S. Kanter
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.038521
Subject(s) - lithium niobate , optics , materials science , optoelectronics , waveguide , photon , photonics , laser , photonic integrated circuit , physics
An efficient source of quantum-correlated photon-pairs that is integrable with existing silicon-electronics fabrication techniques is desirable for use in quantum photonic integrated circuits. Here we demonstrate signal-idler photon pairs with high coincidence-to-accidental count ratios of over 10 3 on a coarse wavelength-division-multiplexing grid that spans 140 nm by using a 300-μm-long poled region in a thin-film periodically-poled lithium-niobate ridge waveguide bonded to silicon. The pairs are generated via spontaneous parametric downconversion pumped by a continuous-wave tunable laser source. The small mode area of the waveguide allows for efficient interaction in a short length of the waveguide and, as a result, permits photon-pair generation over a broad range of signal-idler wavelengths.