Yes, it is possible to go from single-mode to multimode using various methods such as using mode converters or specialized fiber optic cables. Mode converters can be used to transform the light signal from single-mode to multimode, allowing it to travel through multimode fiber optic cables. However, it is important to note that there may be limitations and constraints when converting between single-mode and multimode, and it is best to consult with a professional to determine the best approach for a specific application.