OS1 is defined in ISO/IEC 11801, and OS2 is defined in ISO/IEC 24702. 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. Modes are the possible solutions of the Helmholtz equation for waves, which is obtained by combining. It can transmit higher bandwidth than multimode fiber but requires a light source with a limited spectral range. With a typical core diameter of 8-10 micrometers (μm), single-mode fiber minimizes modal dispersion and enables signal transmission over distances of up to 100. Center wavelength 1) 850nm (MM, multi-mode, low cost, but short transmission distance, usually only 500M); 2) 1310nm (SM, single mode, large loss during transmission, small dispersion, generally used for transmission.
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