title: Tunable graphene Q-switched erbium-doped fiber laser with suppressed self-mode locking effect.
abstract: Self-mode locking effect in a wideband tunable graphene-based passively Q-switched erbium-doped fiber laser has been observed experimentally. Q-switching is achieved by using graphene as a saturable absorber, while a tunable bandpass filter with a narrow bandwidth is used to obtain wideband tunability. We propose to suppress the modulation on each pulse from self-mode locking by introducing three subring resonators constructed with three 3 dB couplers into the laser ring cavity. Moreover, the laser output characteristics with respect to pump power are studied in detail. A stable Q-switched erbium-doped fiber laser with a tunable range from 1522 nm to 1568 nm is demonstrated experimentally.
authors.affiliation: Department of Physics and Astronomy, Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario, Canada. zhoudapeng@gmail.com
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Zhou
authors.forename: Li
authors.initials: L
authors.lastname: Wei
authors.forename: Wing-Ki
authors.initials: WK
authors.lastname: Liu