Figure 5
From: Parametric down-conversion photon-pair source on a nanophotonic chip
On-chip WDM. (a,b) Simulated electric-field profiles of the designed on-chip WDM device for IR (λ=1550 nm) and visible (λ=775 nm) light. (c) Coupling efficiency of IR light to cross port and visible light to drop port. Inset, Zoomed-in image of coupling efficiency for coupling lengths ranging from 200 to 400 μm.
