Miniaturized dual-fiber microbubble spectrometer

We propose a novel spectrometer design method based on dual-fiber microbubble cavities. Dual-fiber microbubble cavities have been utilized to achieve different resonant wavelengths regulated by varying driving power. Experimental results demonstrate that dual peaks with a resolution of 0.02 nm are achieved over a 40 nm bandwidth, utilizing only 108 sampling channels. The device features a compact millimeter-scale footprint. Notably, our spectrometer eliminates the need for on-chip process preparation, enabling low-cost and rapid production, and the achieved resolution matches that of desktop spectrometers.