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A wavelength spacing tunable, multiwavelength Q-switched mode-locked (QML)fiber laser in an erbium-doped fiber cavity based on graphene oxide depositedon tapered fiber is proposed by choosing the diameter and length of the taper,graphene oxide thickness and cavity dispersion, in which the wavelength spacingcould be tuned by pump power. The evolutions of temporal and spectral withdifferent pump strengths are investigated. Results show that the tunability ofthe multiwavelength laser can be interpreted by the bound states of QML laserresulting from a mutual interaction of dispersion, nonlinear effect, insertionloss, and pump power. To the best of our knowledge, it is the firstexperimental observation of bound states of QML, which provides a new mechanismto fabricate tunable multiwavelength laser.

Wavelength Spacing Tunable, Multiwavelength Q-Switched Mode-Locked Laser Based on Graphene-Oxide-Deposited Tapered Fiber