This article details the design, simulation, fabrication, and testing of a fused-tapered few-mode fiber coupler, specifically an SMF-Six-MF coupler, to efficiently generate first-order orbital angular momentum (OAM) modes for applications in optical communication and fiber. This article details the design, simulation, fabrication, and testing of a fused-tapered few-mode fiber coupler, specifically an SMF-Six-MF coupler, to efficiently generate first-order orbital angular momentum (OAM) modes for applications in optical communication and fiber. This article details the design, simulation, fabrication, and testing of a fused-tapered few-mode fiber coupler, specifically an SMF-Six-MF coupler, to efficiently generate first-order orbital angular momentum (OAM) modes for applications in optical communication and fiber lasers. Summary This. Fused biconic taper (FBT) couplers are essential elements in any fibre-optic communications network. We describe two prototype manufacturing process that produces low-loss fibre tapers and fused FBT coupler devices using CO2 lasers as the heat source instead of a flame, as is the norm in modern. A known low loss fused biconical taper fiber optic coupler is fabricating by heating and pulling a plurality of fused optical fibers which may be twisted to provide a minimum biconical taper region. As a result of the pointlike heat source and the versatility associated with scanning, tapers of any transition shape and uniform taper waist can be. We report the development of a fiber taper and fused-fiber coupler fabrication rig that uses a scanning, focused, CO 2 laser beam as the heat source.