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Optics Letters

Optics Letters


  • Vol. 25, Iss. 4 — Feb. 15, 2000
  • pp: 260–262

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

Ming Cai and Kerry Vahala  »View Author Affiliations

Optics Letters, Vol. 25, Issue 4, pp. 260-262 (2000)

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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

OCIS Codes
(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)

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  9. With this assumption, we approximate the coupler as nearly lossless so that reciprocity and energy-conservation relations can be used to relate the various coupling coefficients. The validity of this assumption is affirmed by the experimental results.
  10. Not all devices tested behaved in this manner. Scattering at the taper–sphere coupling is expected in general to be mode dependent and to provide the most significant source of non-coupling-related loss for WGM's. Scattering is believed to be the dominant source of non-coupling-related loss in the current experiments.

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