[AusNOG] submarine fibre amplifier question

[Paul Brooks]

Adding to the earlier responses - yes, the cable generally has a copper tube as a
power conductor, which also act as a little bit of protection for the fibres which run
in the centre of the tube/cable.
Pump one shore-end to +3000 - 5000V, the other shore-end to -3000 - 5000V (depends on
number of amplifiers to be powered, which depends on length of cable, and then each
amplifier is powered from a few tens of volts difference across the amplifier along
the chain.
Only a few amps of current though.

And these days, the industry still uses the term 'repeaters' however they are really
just EDFA amplifiers* which amplify noise as well as signal in the analogue domain -
there is no reception/regeneration/retiming of signal like a repeater of old might
have done.
 
*some specialist applications are starting to use Raman amplification instead of EDFA,
for longer spacing between repeaters.

A good outline, with photos that show the copper power conductor if you look closely
enough at the TESubcom sample against the metal rule...
https://arstechnica.com/information-technology/2016/05/how-the-internet-works-submarine-cables-data-centres-last-mile/

On 6/02/2018 8:43 PM, bryan at telcoindependent.com.au wrote:
>
> I should know the answer to this but my brain is frazzled and my research is sending
> me around in circles.
>
>  
>
> For the existing and new submarine fibre runs, do the amplifiers / repeaters require
> power?
>
>  
>
> My favourite number today is 37.
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>
> Kind regards,
>
> Bryan O'Reilly
> Founder - Telco Independent Consulting
> www.telcoindependent.com.au <http://www.telcoindependent.com.au/>
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