Yes, it is possible to splice single mode fiber to multimode fiber using a mode conditioning patch cord. ๐ Why Can't You Directly Connect SMF and MMF? At its heart, the incompatibility is physical. Legacy. Multimode fiber cabling is used for indoor, short distance applications and single-mode fiber cabling is used for outdoor, long distance application. While they may look similar from the outside, they differ significantly in core size, transmission behavior, distance capability, bandwidth potential, equipment requirements, and overall cost. TOSLINK โ Optical Audio. Fiber Repeaters are used to extend and repeat Ethernet data signals over multimode or single mode fiber up to 160km [100 miles]. They are the ideal solution to connect.