Article | REF: E7105 V2

Optical Fiber Telecommunication Submarine Cables

Author: Olivier GAUTHERON

Publication date: April 10, 2016

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5. Repeater and sea connection unit

5.1 Repeater

The underwater repeater has the following specific features.

  • High reliability

    The number of repeater failures must be limited to three in 25 years per link. This means that for a link of around 150 repeaters, the failure rate per hour of a repeater is 9 × 10 –8 i.e. 90 in 10 9 h, or 90 FIT (Failure In Time ). Since the most critical components in terms of reliability are the laser pump diodes at 980 nm, these are coupled together to power a pair of EDFAs: thus, in the event of failure of one of the pump diodes, the output power of the EDFAs decreases (3 dB loss in the event of failure of 50% of the pump diodes),...

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Repeater and sea connection unit
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