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We introduce a mechanism of stable spatiotemporal soliton formation in amultimode fiber laser. This is based on spatially graded dissipation, leadingto distributed Kerr-lens mode-locking. Our analysis involves solutions of ageneralized dissipative Gross-Pitaevskii equation. This equation has a broadrange of applications in nonlinear physics, including nonlinear optics,spatiotemporal patterns formation, plasma dynamics, and Bose-Einsteincondensates. We demonstrate that careful control of dissipative andnon-dissipative physical mechanisms results in the self-emergence of stable(2+1)-dimensional dissipative solitons. Achieving such a regime does notrequire the presence of any additional dissipative nonlinearities, such amode-locker in a laser, or inelastic scattering in a Bose-Einstein condensate.Our method allows for stable energy (or "mass") harvesting by coherentlocalized structures, such as ultrashort laser pulses or Bose-Einsteincondensates.

Distributed Kerr-Lens Mode-Locking Based on Spatiotemporal Dissipative Solitons in Multimode Fiber Lasers