Extended Data Fig. 2: The round-trip loss of two RDL-ULL layer transitions.
From: 3D integration enables ultralow-noise isolator-free lasers in silicon photonics
Formed into a resonator, the transition loss was determined by fitting the resonator transmission spectrum, at various wavelengths within the C-band. As the total round-trip loss is below 0.06 dB, the insertion loss of a single transition is inferred to be below 0.03 dB (half of the round-trip loss).
