We report on the recovery of population inversion in a CW-pumped erbium-doped fiber amplifier. Spontaneous emissions after the input of signal pulses were temporally resolved. The recovery time for population inversion was estimated to be a few hundred microseconds. The pump power and signal width dependences of the recovery were measured. We discuss the dependences by applying an analytical formula derived for the temporal evolution of population inversion.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: February 21, 2012
Revised Manuscript: April 22, 2012
Manuscript Accepted: April 29, 2012
Published: June 1, 2012
Keiji Kuroda and Yuzo Yoshikuni, "Recovery of population inversion in an erbium-doped fiber amplifier observed by temporally resolving amplified spontaneous emissions," Appl. Opt. 51, 3670-3674 (2012)