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Effect of changing the fiber diameter during the etching process on the resonance: (a) wavelengths; (b) amplitudes; (c) 3-dB bandwidths. Markers are related to the experimental data of 6th (green), 5th (orange) and 4th (blue) orders of cladding modes. Simulation data are reported with solid lines and same color code. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
