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Simply it is a regenerator of digital signal

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Posted by waqqas1

Repeater is a device which repeats the signal and also boost up the optical signal.

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Posted by HamidAliKhan

A device which regenerates and repeats signal.

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Posted by sagitraz

Most but not all repeaters are 3R type, they re-amplify (boost signal), re-shape (removes pulse distortions), and re-time (removes timing jitter to improve clock recovery) the received optical signal.

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Posted by Christ

Repeaters are used also to boost an optical signal but in addition they are used to clean the sign up, recondition the signal, to allow for longer transmissions.

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Posted by casey

regenerator of digital signal

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Posted by Hash007