TY - JOUR
T1 - Characteristics of correlated photon pairs generated in ultracompact silicon slow-light photonic crystal waveguides
AU - Xiong, Chunle
AU - Monat, Christelle
AU - Collins, Matthew J.
AU - Tranchant, Laurent
AU - Petiteau, David
AU - Clark, Alex S.
AU - Grillet, Christian
AU - Marshall, Graham D.
AU - Steel, Michael J.
AU - Li, Juntao
AU - Ofaolain, Liam
AU - Krauss, Thomas F.
AU - Eggleton, Benjamin J.
PY - 2012
Y1 - 2012
N2 - 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 ∼/30), the bandwidth for correlated photon-pair generation in 96-and 196-μm-long waveguides was at least 11.2 nm, while a 396-μm-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-μm-long waveguide. Within the measurement errors, the maximum CAR achieved in 96-, 196-, and 396-μm-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.
AB - 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 ∼/30), the bandwidth for correlated photon-pair generation in 96-and 196-μm-long waveguides was at least 11.2 nm, while a 396-μm-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-μm-long waveguide. Within the measurement errors, the maximum CAR achieved in 96-, 196-, and 396-μm-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.
UR - http://www.scopus.com/inward/record.url?scp=84866296232&partnerID=8YFLogxK
U2 - 10.1109/JSTQE.2012.2188995
DO - 10.1109/JSTQE.2012.2188995
M3 - Article
AN - SCOPUS:84866296232
SN - 1077-260X
VL - 18
SP - 1676
EP - 1683
JO - IEEE Journal on Selected Topics in Quantum Electronics
JF - IEEE Journal on Selected Topics in Quantum Electronics
IS - 6
M1 - 6157693
ER -