Compact　and　high-power　2.8　μm　ultrashort　pulse　laser　generated　in　a　strictly　all-fiberized　system　is　a　growing　interest　in　the　field　of　the　mid-infrared　high-power　laser　community.　In　this　Letter,　we　demonstrated　the　generation　of　watt-level　2.8　μm　ultrashort　pulse　laser　from　an　all-fiber　Er:ZBLAN　amplifier　by　using　the　red-shifted　Raman　soliton　pulse　as　the　seed　source.　As　the　incident　pump　power　increased　to　8.8　W,　the　average　output　power　and　pulse　energy　of　the　2.8　μm　soliton　pulses　were　boosted　to　1.25　W　and　26.02　nJ,　respectively.　To　achieve　the　all-fiber　configuration,　the　pump　laser　at　976　nm　was　coupled　into　Er:ZBLAN　fiber　by　a　home-made　fluoride-fiber-based　side-pump　combiner　(FFSPC).　Numerical　simulations　were　performed　by　solving　the　generalized　nonlinear　Schrödinger　equation,　which　showed　that　the　pulse　duration　of　amplified　pulses　was　limited　by　intracavity　dispersion　accumulation　in　Er:ZBLAN　fiber　amplifier,　and　the　final　pulse　duration　was　estimated　to　be　5　ps.　To　the　best　of　our　knowledge,　this　is　the　first　all-fiber　structured　2.8　μm　ultrashort　pulse　amplifier　with　an　FFSPC.　Our　results　may　provide　an　effective　approach　for　the　generation　of　all-fiber　high-power　mid-infrared　ultrafast　lasers.　©　2022　Elsevier　Ltd