Generation of broadband correlated photon-pairs in short thin-film lithium-niobate waveguides

Bradley S. Elkus*, Kamal Abdelsalam, Ashutosh Rao, Vesselin Velev, Sasan Fathpour, Prem Kumar, Gregory S. Kanter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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 103 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.

Original languageEnglish (US)
Pages (from-to)38521-38531
Number of pages11
JournalOptics Express
Issue number26
StatePublished - 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Generation of broadband correlated photon-pairs in short thin-film lithium-niobate waveguides'. Together they form a unique fingerprint.

Cite this