Extended Data Fig. 7: On-chip transmission spectrum and end-facet reflections.
From: Low-power integrated optical amplification through second-harmonic resonance
(a) On-chip signal transmission spectrum through device. Smoothed line also shown to guide the eye. (b) Inset: zoom in on sinusoidal ripples due to end-facet reflections on either side of the chip, creating a weak standing-wave cavity. (c) Simulated amplified signal transmission in the presence of facet reflections, for gains ranging from 0 to 20 dB. The gain ripples increase close to threshold, where net gain approaches net round-trip loss.
