Abstract
An integrated in-fiber dual whispering gallery mode resonators device is proposed. The device consists of a multimode optical fiber with a V-shaped end cavity, embedded by two microspheres and a tapered single-mode fiber. The whole device structure is sheathed by a capillary tube for protection. The device is simple in fabrication, robust in structure, and has a good quality (Q) factor of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$3.2 \times 10^{4}$ </tex-math></inline-formula> .
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