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A compact fiber loop laser is developed based on Fano resonance in sub-wavelength metallic grating coupled whispering gallery mode (WGM) resonator. The laser utilizes the erbium-doped fiber amplifier as the gain medium, and the metallic grating coupled WGM resonator serves as a narrow linewidth filter to stabilize the lasing performance. The new sub-wavelength metallic grating coupler enables single-port...
In this paper, we investigated whispering gallery mode (WGM) coupling in fused silica microspheres using fused-tapered fiber tips (FTFT). FTFT couplers are fabricated from single mode fibers using a standard splicing machine. FDTD simulation is first performed to demonstrate the feasibility of FTFT coupling to spherical WGM resonators. Two separate experiments are then conducted to characterize the...
A novel whispering gallery mode (WGM) resonator that relies on index profiling instead of shape variation to confine light is proposed and theoretically studied. Analytical derivations show that a parabolic index profile along the resonator axial direction is able to confine light within its two caustics. This enables efficient coupling of WGM by applying evanescent couplers at the caustics.
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