Cables/Connecting

Fibre pair subsea telecom cable systems qualified

24th January 2020
Alex Lynn

NEC Corporation and its subsidiary OCC Corporation have announced that they have completed full qualification of subsea repeaters and optical cable containing up to 20 fibre pairs (40 fibres). This is a 25% improvement in fibre count over 16 fibre pair systems previously built by NEC. 

This development allows cable owners worldwide to construct subsea telecom cables capable of the highest traffic capacity, while optimising the cost per bit of the wet plant.

NEC achieved this milestone with only minor modifications to its proven repeater and cable designs. This was done by optimising key repeater components, and by proving that its existing cable design could easily accommodate more fibres. The 20 fibre pair repeaters continue to use quadruple pump sharing technology, first introduced by NEC in 2010, for high optical and electrical efficiency.

OCC's 20 fibre pair cable can be manufactured using a wide range of existing optical fibres, according to the needs of each new cable system. Furthermore, OCC has demonstrated to its customers that they can visually identify individual fibres using a combination of ring marking and conventional fibre colouring. This allows the potential number of fibres in a cable to be greatly expanded. Significantly, in OCC cable, the fibre's transmission performance is completely unaffected, either by the fibre colouring or cabling processes.

"As global capacity demand continues to soar, NEC is committed to helping our customers scale up their networks in a cost-effective way," said Takaaki Ogata, Executive Technical Manager of NEC's Submarine Network Division. "Further significant increases in the fibre pair count of NEC's wet plant are coming soon," he added.

Mass production of the newly qualified subsea repeaters and optical cable has already started.

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