Linear-regression-based approach for loss extraction from ring resonators.

This Letter proposes and demonstrates a linear-regression-based loss-extraction model that is applicable for all-pass rings and symmetrically and asymmetrically coupled add-drop rings. The model is derived by transforming the transmission spectra of a ring into linear relationships with no approximation. An all-pass ring resonator is fabricated to verify the model, and the experimental results indicate that the proposed model is more reliable than previously reported models [Opt. Express14, 3872 (2006)OPEXFF1094-408710.1364/OE.14.003872; Opt. Express15, 10553 (2007)OPEXFF1094-408710.1364/OE.15.010553; and J. Lightwave Technol.16, 1308 (1998)JLTEDG0733-872410.1109/50.701410].