The industry standard for Single Mode Fiber (SMF) focuses on two specific wavelength ranges, or windows, for efficient long-distance data transmission: the 1310 nanometer (nm) band and the 1550 nm band. In fiber-optic communication, a single-mode optical fiber, also known as fundamental- or mono-mode, is an optical fiber designed to carry only a single mode of light - the transverse mode. These low-loss windows are essential for maintaining the performance and reach of fiber optic communication systems. Higher-order modes like LP 11, LP 20 etc. It can be used in all cable constructions, including loose tube, tight buffered, ribbon, and.