652 fiber is designed to have a zero-dispersion wavelength near 1310 nm, therefore it is optimized for operation in the 1310nm band and can also operate at 1550 nm. It details the fiber's geometrical, optical. There are 19 different single mode optical fiber specifications defined by the ITU-T, among which G. 652 fiber is the most commonly used. Whether it is a long-distance network, local network, or access network, it is the absolute protagonist, accounting for more than 95% of its overall. Standard single-mode fiber (G. 652 into four types of optical fibers.