Converting multimode to single-mode fiber solves the MMF transmission restrictions, boosting the fiber link up to 140km. Fiber to fiber media converter, WDM transponder, and mode conditioning patch cables are three solutions for mode conversion. 📝 Why Can't You Directly Connect SMF and MMF? At its heart, the incompatibility is physical. We will introduce each method one by one next. Mode conversion is typically required when: FlexPoint unmanaged Fiber-to-Fiber Media Converters provide multimode to single-mode conversion, and support a variety of network. They are typically categorized into two main types: multimode fiber (MMF) and single-mode fiber (SMF), distinguished by their transmission modes. When Is Multimode to Single-Mode Conversion Required? If you must know one thing about fiber optic cable, it's the difference between single-mode and multimode fibers.