Extended Data Fig. 5: Dichroic coupler characterization.
From: Low-power integrated optical amplification through second-harmonic resonance
(a) Microscope Image of fabricated dichroic coupler (0.5 mm straight coupling region is cropped out, left half reflected and shown for clarity). (b) Transmission spectra of dichroic coupler drop (top) and through (bottom) ports. (c) Simulated symmetric mode profiles of fundamental and second harmonic in coupler region.
