We investigate numerically the interactions of two in-phase and out-of-phase Airy beams and nonlinear (NL) accelerating beams in Kerr and saturable NL media, in one transverse dimension. We find that bound and unbound soliton pairs, as well as single solitons, can form in such interactions. If the interval between two incident beams is large relative to the width of their first lobes, the generated soliton pairs just propagate individually and do not interact. However, if the interval is comparable to the widths of the maximum lobes, the pairs interact and display varied behavior. In the in-phase case, they attract each other and exhibit stable bound, oscillating, and unbound states, after shedding some radiation initially. In the out-of-phase case, they repel each other and, after an initial interaction, fly away as individual solitons. While the incident beams display acceleration, the solitons or soliton pairs generated from those beams do not.

We demonstrate a novel type of stable multicomponent vector solitons consisting of two perpendicular four-wave mixing (FWM) dipole components induced by electromagnetically induced gratings. We analyze the formation and steering of the steady dipole solitons and their dynamical (energy transfer) effects. The dipole-mode solitons of two FWM processes have horizontal and vertical orientations, respectively. Omnidirectional Bragg reflections are also investigated.

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An asymmetrical π-phase-shift distributed feedback (DFB) fiber laser written in erbium/ytterbium co-doped fiber is fabricated. A new self-injection locking method is employed to make the proposed DFB fiber laser operate in single polarization states, which is composed of a polarization-dependent isolator and an optical circulator. The output character is investigated. 9.5 mW of the backward output power is obtained at the 159 mW pump power. The output power in one side is much higher than that in the other side, indicating that the DFB fiber laser operates in the unidirectional output. The delayed self-homodyne measurement is employed to detect the radio frequency spectrum of the DFB fiber laser. This novel single polarization DFB fiber laser has the potential application in the fiber optical sensor and optical communications. Frequency, MHzThe RF spectrum of free running DFB fiber laser by using the delayed self-homodyne measurement

We theoretically investigate the dually dressed electromagnetically induced transparency, and the multidressed four-wave mixing ͑FWM͒ and six-wave mixing ͑SWM͒ processes in an inverted-Y-type atomic system with Zeeman sublevels. The results show that the Zeeman degeneracy of the dark states can be lifted by the dressing field as its intensity is increased. Moreover, the derived analytical expressions indicate that one can, for example, selectively create secondary dark states on the multi-Zeeman-sublevel dark states ͑by tuning the coupling field͒, distinguish two different types of dark states generated in two FWM processes ͑by properly controlling the coupling field intensity͒, and selectively enhance multi-FWM signals coming from various paths consisting of split Zeeman sublevels ͑by tuning the dressing field͒. The SWM signals can be either enhanced or suppressed by controlling the dressing field.