There are two main types of fiber optic cables: single-mode fiber (SMF) and multimode fiber (MMF). SMF has an extremely thin layer of core, measuring 8-9µm in diameter. Its small core size enables it to carry only one light s. There are two main types of fiber optic cables: single-mode fiber (SMF) and multimode fiber (MMF). SMF has an extremely thin layer of core, measuring 8-9µm in diameter. Its small core size enables it to carry only one light signal or mode, making it ideal for long-distance transmission since it is not affected by fiber bending or stretching. Multim. Fiber optic cablesconsist of a core, made of glass or plastic, and cladding, which is also made of glass or plastic. The glass core is surrounded by the cladding, which has a lower index of refraction. This difference in refractive indices of glass fibers between the core and cladding creates total internal reflection, enabling data to be transmitt. The core of fiber optic cables is measured in microns (µm). The core size of multimode fiber cables is 50µmand 62.5µm, while single-mode fiber cables are measured in 8-9µm.Fiber optic wavelength is measured in nanometers. Multimode fiber wavelengths are 850nm and 1300nm, while single-mode fiber wavelengths are 1310nm and 1550nm. Fiber optics carry different frequencies of light waves. The wavelength is like a light color, and fiber optic cables are typically made to transmit one of two colors: 850nm or 1310nm. These. When using a multimode, 850nm fiber optic cable is the most common type of fiber used in transmission. It has a lower attenuation rate, meaning it can carry data light signals without losses. The 1300nm fiber optic cable is less common but has a higher bandwidth than traditional copper cables, making it better suited for high-speed transmission. Th.