Wavelength-selectable and steady single-mode erbium-doped fiber multiple ring laser

Abstract

To achieve a stable and selectable C-band erbium-doped fiber (EDF) laser with singlelongitudinal-mode output, a multiple ring architecture is proposed and demonstrated experimentally. In this work, we design a passively quadruple-ring structure in the cavity of an EDF laser to produce a Vernier effect with a mode filter for suppressing the multimode spikes significantly. In addition, the output performance and stability of the proposed EDF ring laser are discussed.