Spatial-mode switchable EDF laser based on low modal-crosstalk mode MUX/DEMUX

摘要

We report an all-fiber ring laser that emits three linearly polarized (LP) modes based on the intracavity mode multiplexer/demultiplexer (MUX/DEMUX). The low modal-crosstalk all-fiber mode MUX/DEMUX consisting of cascaded mode-selective couplers (MSCs) multiplex/demultiplex multiple spatial modes. The output mode lasing of the Erbium-doped fiber (EDF) laser can be switched among the three LP modes by employing combination of a mode MUX and a simple N×1 optical switch. The slope efficiencies, optical spectra and mode profiles are investigated.