Ring saturable absorber for 1530-nm Q-switched Er-doped fiber laser

An all-fiber passively Q-switched 1530-nm erbium doped fiber laser was demonstrated. This absorber was a simple ring cavity composed‥ Sequential 1530-nm Q-switched laser pulses with 77.5-KHz repetition rate, 377-nJ pulse energy, Q-switched duration of 3µs.