Generation of mode-locked states of conventional solitons and bright-dark solitons in graphene mode-locked fiber laser

Abstract

This paper proposes a mode-locked fiber laser based on graphene-coated microfiber. The total length of the fiber laser resonant cavity is 31.34 m. Under the condition of stable output of bright-dark soliton pairs from the fiber laser, dual-wavelength tuning is realized by adjusting the polarization controller (PC), and the wavelength tuning range is 11 nm. Furthermore, the effects of polarization states on bright-dark solitons are studied. It is demonstrated that the mode-locking state can be switched between conventional solitons and bright-dark solitons in the graphene mode-locked fiber laser. Bright-dark soliton pairs with different shapes and nanosecond pulse width can be obtained by adjusting the PC and pump power. Graphical Abstract

Methods Controlling Radiation Parameters of Mode-Locked All-Fiberized Lasers

“…The possibility of fibre bending as a method of controlling the parameters of radiation propagating inside is a well-known fact [2]. In particular, fibre-optical polarisation controllers (based on bending and torsion of fibre [3]) are used both for triggering passive mode-locked operation [4] and for control over the output parameters of MLFL 9 (see, for instance, [5,6]). Other problems of action of a three-paddle manual polarisation controller on fibre are that a particular setting is virtually irreproducible and, additionally, has a drift that necessitates periodic re-tuning.…”