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In fiber optic communication, a singlemode optical fiber cable is designed to carry only a single ray of light. Singlemode fiber also known as, SMF, monomode optical fiber and unimode fiber are better at retaining the fidelity of each light pulse over longer distances than multi-mode fibers.
Fiber optics also known as "optical fiber" refers to the technology associated with informationbeing transfered or transmitted as light impulses through fiber. Optical fiber cables carry more information than convententional copper wires and is far less subjected to electromagnetic interference.