Observation of Critical Coupling in a Fiber Taper to a Silica-Microsphere Whispering-Gallery Mode System

Citation

Cai, M., Painter, O., & Vahala, K. J. (2000). Observation of Critical Coupling in a Fiber Taper to a Silica-Microsphere Whispering-Gallery Mode System. Physical Review Letters, 85(1), 74–77.

Keywords

• critical coupling
• whispering-gallery mode resonator
• fiber taper, power transfer
• silica microsphere
• Q factor
• extinction
• overcoupling
• waveguide

Brief

Extremely efficient and controlled power transfer to high-Q 107 resonators has been demonstrated in a high-Q fused-silica microsphere whispering-gallery mode resonator coupled to a fiber taper.

Summary

This article presents the observation of critical coupling in a high-Q fused-silica microsphere whispering-gallery mode resonator coupled to a fiber taper. The authors demonstrate that this method enables extremely efficient and controlled power transfer to high-Q 107 resonators. They were able to achieve on-resonance extinction in transmitted optical power through the fiber coupler as high as 26 dB at the critical coupling point.

Origin: https://www.semanticscholar.org/paper/Observation-of-critical-coupling-in-a-fiber-taper-a-Cai-Painter/5059d86da4e403cd30121a5b024104bbabb4ef69