EDF laser with double-Bragg grating selection

We present a new configuration of ring erbium doped fiber laser with specific way of wavelength selection. The fiber circulator with a novel configuration of two Bragg gratings was applied. The wavelength selectivity of the ring laser can be substantially improved when the transmission characteristics of both gratings are partly overlapped. Additional element improving the stability of the laser can be obtained when its state of polarization is controlled.