According to the TIA-598C standard definition, for non-military applications, single mode cable is coated with yellow outer sheath, and multimode fiber is coated with orange or aqua jacket. Find more details about the Fiber Optic Cable Color Code here. Multimode fiber usually comes in orange (OM1 and OM2), aqua (OM3 and OM4), or lime green (OM5). There are different types of fiber optic cables because each type is optimized for specific applications that have unique requirements for bandwidth, transmission distance, and environmental factors. 5um, they allow for multiple modes of light to propagate within the fiber.