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A hollow bottle-like microresonator (BLMR) with ultra-high quality factor isfabricated from a microcapillary with nearly parabolic profile. At 1.55 $\mu m$pumping, degenerate four-wave mixing can be observed for a BLMR of diameter 102$\mu$m. The parabolic profile of the BLMR guarantees a nearly zero waveguidedispersion, which is theoretically discussed in detail. From the simulation, at1.55 $\mu$m wavelength in such a BLMR, the fundamental bottle mode is in theanomalous dispersion regime, whilst the ordinary whispering gallery mode (WGM)confined at the center of the BLMR is in the normal dispersion regime.Experimentally, no degenerate FWM is observed for the WGM selected bypositioning the coupling tapered fiber in the same BLMR. Furthermore,dispersion tuning is briefly discussed. As the work predicted, the BLMR showspromise for the implementation of sparsely distributed, widely spannedfrequency combs at the telecommunication wavelength.

Degenerate four-wave-mixing in a silica hollow bottle-like microresonator