We show that, in a coherent two-level optical amplifier with Kerr nonlinearity and linear loss, any weak seed pulse evolves into a fixed powerful linearly chirped pulse with quasi-parabolic shape. This process is associated with a transition from the incoherent into the coherent amplification regime, thus enabling in practice the generation of pulses with a spectrum wider than the linear gain bandwidth.
© 2010 Optical Society of America
Original Manuscript: March 25, 2010
Revised Manuscript: May 20, 2010
Manuscript Accepted: May 21, 2010
Published: June 10, 2010
Victor V. Kozlov and Stefan Wabnitz, "Quasi-parabolic pulses in a coherent nonlinear optical amplifier," Opt. Lett. 35, 2058-2060 (2010)