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