Characteristics of Correlated Photon Pairs Generated in Ultracompact Silicon Slow-Light Photonic Crystal Waveguides

Chunle Xiong*, Christelle Monat, Matthew J. Collins, Laurent Tranchant, David Petiteau, Alex S. Clark, Christian Grillet, Graham D. Marshall, Michael J. Steel, Juntao Li, Liam O'Faolain, Thomas F. Krauss, Benjamin J. Eggleton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


We report the characterization of correlated photon pairs generated in dispersion-engineered silicon slow-light photonic crystal waveguides pumped by picosecond pulses. We found that taking advantage of the 15-nm flat-band slow-light window (v(g) similar to c/30), the bandwidth for correlated photon-pair generation in 96- and 196-mu m-long waveguides was at least 11.2 nm, while a 396-mu m-long waveguide reduced the bandwidth to 8 nm (only half of the slow-light bandwidth due to the increased impact of phase matching in a longer waveguide). The key metrics for a photon-pair source: coincidence to accidental ratio (CAR) and pair brightness were measured to be a maximum 33 at a pair generation rate of 0.004 pair per pulse in a 196-mu m-long waveguide. Within the measurement errors, the maximum CAR achieved in 96-, 196-, and 396-mu m-long waveguides is constant. The noise analysis shows that detector dark counts, leaked pump light, linear and nonlinear losses, multiple pair generation, and detector jitter are the limiting factors to the CAR performance of the sources.

Original languageEnglish
Pages (from-to)1676-1683
Number of pages8
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number6
Publication statusPublished - 2012


  • slow light
  • Nonlinear optics
  • quantum photonics
  • silicon photonic crystal


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