title: Square-wave pulse with ultra-wide tuning range in a passively mode-locked fiber laser.
abstract: We report the generation of ultrawide tunable square-wave pulse in an erbium-doped mode-locked fiber laser. The pulse width can be tuned in an ultrawide range of more than 1700 ns by simply increasing the pump power. The pulse-width tuning is 5.1 ns/mW. To the best of our knowledge, this is the widest pulse-width tuning range of any square-wave pulse in an all-fiber passively mode-locked fiber laser. Experimental results show that the fiber nonlinearity plays an important role in the tuning range of the output pulse width. The high nonlinearity helps to increase the tuning range of the pulse width.
authors.affiliation: Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Xianming
authors.initials: X
authors.lastname: Zhang
authors.forename: Chun
authors.initials: C
authors.lastname: Gu
authors.forename: Guoliang
authors.initials: G
authors.lastname: Chen
authors.forename: Biao
authors.initials: B
authors.lastname: Sun
authors.forename: Lixin
authors.initials: L
authors.lastname: Xu
authors.forename: Anting
authors.initials: A
authors.lastname: Wang
authors.forename: Hai
authors.initials: H
authors.lastname: Ming