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A general model is presented for coupling of high-$Q$ whispering-gallerymodes in optical microsphere resonators with coupler devices possessingdiscrete and continuous spectrum of propagating modes. By contrast toconventional high-Q optical cavities, in microspheres independence of highintrinsic quality-factor and controllable parameters of coupling via evanescentfield offer variety of regimes earlier available in RF devices. The theory isapplied to the earlier-reported data on different types of couplers tomicrosphere resonators and complemented by experimental demonstration ofenhanced coupling efficiency (about 80%) and variable loading regimes withQ>10^8 fused silica microspheres.Comment: 14 pages, 4 figure

Optical microsphere resonators: optimal coupling to high-Q whispering-gallery modes