By using a pre-chirped single-mode fiber (SMF) segment for controlling the chirp of fiber laser pulse before launching into the Er-doped fiber and the last compression stage.

• 而在脉冲被放大之前，我们利用单模光纤事先引入适当的负啾频量，目的是要预先补偿在放大的过程中所引入的正啾频量，使脉冲在放大的过程中能够连续地窄化。