Means of coupling light into optical fibers and methods of manufacturing a coupler

摘要

The invention relates to a pump coupler ( 2 ) and a manufacturing method. The pump coupler ( 2 ) comprises a least one signal fiber ( 50 ) for outputting optical energy, multiple pump fibers ( 31 ) for inputting optical energy into the signal fiber ( 50 ), and a coupling structure ( 40 ) for coupling the optical energy of the pump fibers ( 31 ) into the signal fiber ( 50 ). A signal feed-through fiber ( 32 ) goes through the coupling structure ( 40 ). In accordance with the invention the coupling structure ( 40 ) is a tapering capillary tube ( 40 ) having a first wide end ( 65 ) and a second narrow end ( 70 ), the pump fibers ( 31 ) arc connected to the wide end of the capillary tube ( 40 ), and at least the narrow end ( 70 ) of the capillary tube ( 70 ) is collapsed around the signal fiber ( 32 ).