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światłowód - oceaniczny-podmorski kabel światłowodowy informacje

21 Mar 2014 23:37 1425 2
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    google fiber optic cable atlantic usa europe repeaters


    Submarine communications cable - Wikipedia, the free encyclopedia 2014.03
    Repeaters are powered by a constant direct current passed down the conductor near the center of the cable, so all repeaters in a cable are in series. Power feed equipment is installed at the terminal stations. Typically both ends share the current generation with one end providing a positive voltage and the other a negative voltage. A virtual earth point exists roughly halfway along the cable under normal operation. The amplifiers or repeaters derive their power from the potential difference across them.

    The optic fiber used in undersea cables is chosen for its exceptional clarity, permitting runs of more than 100 kilometers between repeaters to minimize the number of amplifiers and the distortion they cause.