What is Single Mode Fiber?

What is Single Mode Fiber?

Single Mode Fibers 

Basically single mode fibers have only one path for transmission i.e. only one mode can travel through it. And this core diameter is narrow (2 to 10µm). Single mode fibers refractive index difference between core and cladding is very small. Also single mode fibers are always step indexed because the core is narrow which cannot be graded indexed. Only lasers can be used as optical sources. Dispersion does not occur as there is no degradation of the signal during its propagation through the fiber. and are suitable for long distance communication due to its high data carrying capacity. And fabrication is very difficult to make expensive. It is very difficult to pass light between these fibers and connect two fibers.

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