Figure 10. Comparison of the ring transfer function recorded at high (10 dBm in waveguide) and low (−6 dBm in waveguide) optical power levels and determination of the laser detuning relative to the thermally shifted resonant frequency.

The laser detuning read from (b) after mapping is also the actual laser detuning relative to the thermally shifted resonance for (a) and is the detuning taken into account in the fitting of the experimental results. The transfer function in (b) is overlaid with a fit corresponding to an ideal ring model (i.e., without thermal effects).