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http://www.multicominc.com/training/technical-resources/single-mode-vs-multi-mode-fiber-optic-cable/
have look at the link I hope that you will find all your answer.
Multi mode fiber has a relatively large light carrying core, usually.5 microns or larger in diameter. It is usually used for short distance transmissions with LED based fiber optic equipment. Single-mode fiber has a small light carrying core of8 to microns in diameter. It is normally used for long distance transmissions with laser diode based fiber optic transmission equipment.
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