A multi-mode interferometer (MMI), also known as a multimode interference coupler, is a micro-scale structure in which light waves can travel, such that the optical power is split or combined in a predictable way. Mode: A single path for light to travel within the fiber. Singlemode Fiber (SM / SMF): Fiber with a small core (~9µm) that allows only one mode of light. Used for long-distance, high-speed. In an MMI, light is confined and guided, and thus the MMI is essentially a broad. This comprehensive reference of standardized fiber optic acronyms is a resource for understanding technical shorthand across networking and telecommunications. We add new fiber optic industry acronyms daily to provide the most comprehensive reference. They are designed not only to output a certain fraction of the input power. Calculate the broadband transmission and optical loss through a 1×2 port multi-mode interference (MMI) coupler. Use the device S-parameters to create a compact model of the MMI in INTERCONNECT.