Dual-frequency shift leads to chaos and beating in an erbium-doped fiber laser

We present a dual-frequency shift scheme to produce chaos and beating in an erbium-doped fiber laser while we give this physics model including photo attenuator absorbing the photon, where absorption frequency of can be shifted, pump modulator shifting modulation frequency. It found that modulated produces chaos, beating, lot quasi-periodic states when both level are by modulator. Our numerical result illustrates route or away from after quasi-period frequencies dual-cycle, cycle-3, cycle-4, quasi-cycle, occurs laser. discuss effects two on dynamics. And find distribution with variations absorption. guide dynamics The has great referenced values laser, optics, chaos.