A 1. 55 μm fiber soliton laser is described and the transmission experiment of thefiber soliton pulse by using it as an amplifier is also introduced.A mode locked erbium fiberlaser is used in the experiment. Experimentally, the output pulse width and spectrum widthof the fiber soliton laser are 30 ps and 0.16 nm, respectively. There is nearly no change forthe output pulse width and the spectrum width after the transmission of a 50 km dispersive displacement optical fiber.