A multiwavelength fibre laser with wavelength-switchable operation has been demonstrated, utilizing the combined effects of polarization hole burning and intensity-dependent transmission. Polarization-maintaining erbium fibre (PM-EDF) with an anisotropic gain is used as the gain medium to suppress the mode competition. Simultaneously, the PM-EDF and the polarizer in the cavity form an equivalent periodic filter. Four lasing wavelengths simultaneously oscillating are obtained, which are stable over an hour at room temperatures. Furthermore, by adjusting the polarization controllers the laser can also produce triple-, dualand single-wavelength lasing oscillations, which can be switched among the four simultaneously oscillating wavelengths.
We experimentally demonstrate the high frequency chaotic dynamics of an erbium-doped fiber ring laser based on the nonlinear Kerr effect. The route to chaos is experimentally observed with the pump current increased when the polarization controller is adjusted to a fixed and appropriate position. The interference among the multiple circulated electromagnetic fields from the erbium-doped fiber ring cavity can exhibit the quasi-period route to chaos, and the interference length is longer than the fiber ring cavity length.
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