The optimum layout of a single-fiber data bus T-system based on a planar access coupler has been calculated. In this layout the tapping ratio of each individual access coupler is optimized permitting a considerably higher number (typically twice as many) of terminals than in a nonoptimized system.
F. Auracher and H.-H. Witte, "Optimized layout for a data bus system based on a new planar access coupler," Appl. Opt. 16, 3140-3142 (1977)