4 ms·
Submarine cable systems often employ repeaters (hardened EDFAs). I remember one vendor bragging that not one of their units had EVER failed in service. If you
by bdb 15y ago
Submarine cable systems often employ repeaters (hardened EDFAs). I remember one vendor bragging that not one of their units had EVER failed in service.
If you want to see what they look like:
http://www.nec.com/en/global/prod/nw/submarine/product/ns-series.html http://www.nec.com/en/global/prod/nw/submarine/product/ns-se...
- bdb 15y agoActually, there are much better photos in this PDF: http://www.nec.com/en/global/prod/nw/submarine/pdf/submarine-brochure.pdf http://www.nec.com/en/global/prod/nw/submarine/pdf/submarine... Look at the last page for a photo of one of the amps with people in the frame for scale.
- samstave 15y agoThat PDF is great, thanks. Jesus - they are huge. Earlier in the PDF, they appear small. Is that a single strand they are amplifying with these? I'd like to find cost figures for how much it is to run a single fiber trans-oceanically (if thats a word).
- dotBen 15y agoHow do they power the repeaters? I thought the cable itself was just fiber optic, thus no electricity transmission
- cullenking 15y agoThey talk about it in the PDF. Apparently they use a 1400nm laser along the same fiber that excites some receptor, which provides the power for the amplification.