Package of a dual-tapered-fiber coupled microsphere resonator with high Q factor

• We package a dual-taper coupled microsphere resonator with high Q factor.
• This device has advantages of portability, low-cost, and ease of fabrication.
• Thermal tuning of the drop wavelength has been demonstrated.

We package a high-quality (Q) factor optical whispering gallery mode (WGM) microsphere resonator side coupled to two tapered fibers without changing the initial coupling conditions, achieving a final Q as high as 2.7×106. The mechanical stability of the coupling system is improved by placing the tapers in contact with the microsphere. The packaged device can be easily sealed in a targeted hermetic box according to different practical applications, which provides long term maintenance of the coupling efficiency and high-Q factor. Moreover, we test the temperature dependence of the packaged device and demonstrate its capability for thermal tuning of the drop wavelength. This device has a variety of advantages, such as portability, low-cost, and ease of fabrication.