Multiwavelength polarization maintaining erbium doped fiber lasers

In this paper simultaneous multiwavelength lasing in fiber ring laser using PM EDF (polarization maintaining erbium doped fiber) is presented. Experimental results indicate that multiwavelength lasing is connected with the elliptical polarization state of the output signal. By changing the polarization state of both the lasing signal and the pump signal and their placement towards each other we can obtain linear polarization with the maximal value and stability of fiber laser signal. It is important that the direction of lasing signal vibrations be consistent with one of the major PM fiber axes.