An　all-fiber　polarization　maintaining　laser　system　of　wavelength　tunable　from　1.76　to　1.84　µm　based　on　the　Raman-induced　soliton　self-frequency　shift　in　an　erbium-doped　amplifier　is　demonstrated.　The　system　only　includes　oscillator　and　two-stage　amplifiers　which　are　built　entirely　based　on　commercial　silica　fibers　and　devices.　The　ultra-short　pulse　achieved　by　oscillator　and　first　amplifier　stage　by　the　method　of　nonlinear　compression　is　delivered　into　second　amplifier　stage　which　is　designed　as　both　Raman　shifter　and　amplifier.　Within　the　pump　power　range　of　16-25　W,　tunable　Raman　soliton　can　be　obtained　with　the　average　power　gradually　increases　from　~180　mW　to　~250　mW　as　the　center　wavelength　of　the　soliton　shifts　towards　the　longer　wavelength　direction　within　the　range　of　1.76　to　1.84　μm.　The　system　delivers　Raman　soliton　from　an　entirely　fiberized,　fusion　spliced　system　without　any　free-space　optics,　which　can　provide　robust　and　stable　soliton　generation.　To　our　knowledge,　this　tunable　soliton　source　is　the　highest　output　power　demonstrated　within　1.7-1.8　μm　wavelength　range　from　an　all-fiber　polarization　maintaining　laser.　Our　experiment　provides　a　feasible　femtosecond　source　for　multiphoton　microscopy.　©　2024　SPIE.