  We report the generation of an optical frequency comb featuring 28 THz
bandwidth, sustained by a single 80 fs cavity soliton recirculating in a fiber
Fabry-Perot resonator. This large spectrum is comparable to frequency combs
obtained with microresonators operating in the anomalous dispersion regime.
Thanks to the compact design and the easy coupling of the resonator, cavity
solitons can be generated in an all-fiber experimental setup with a continuous
wave pumping scheme. We also observe the generation of a dispersive wave at
higher frequencies which is supported by higher-order dispersion. These
observations align remarkably well with both numerical simulations and the
established theory of cavity solitons.
