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.
© 2000 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(230.1150) Optical devices : All-optical devices
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators
Ming Cai and Kerry Vahala, "Highly efficient optical power transfer to whispering-gallery modes by use of a symmetrical dual-coupling configuration," Opt. Lett. 25, 260-262 (2000)