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Published February 15, 2000 | public
Journal Article Open

Highly efficient optical power transfer to whispering-gallery modes by use of a symmetrical dual-coupling configuration


We report that greater than 99.8% optical power transfer to whispering-gallery modes was achieved in fused-silica microspheres by use of a dual-tapered-fiber coupling method. The intrinsic cavity loss and the taper-to-sphere coupling coefficient are inferred from the experimental data. It is shown that the low intrinsic cavity loss and the symmetrical dual-coupling structure are crucial for obtaining the high coupling efficiency.

Additional Information

© 2000 Optical Society of America Received September 28, 1999 This work was supported by the Defense Advanced Research Projects Agency. The authors thank O. Painter for valuable discussions. K. J. Vahala thanks A. Yariv for helpful discussions on critical coupling.


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