Re: The Repeater System
Repeaters can also use the energy from a laser
Not really. It's like AmenFromMars says. Onshore there's PFE (Power Feeding Equipment) in the landing stations along the cable*. The PFEs feed a lot of DC into the copper core that's a tube around the fibre core, with some hefty insulation between that and the outer armour wire and sheathing. Then every 150km or so there are the repeaters, aka 'torpedoes' that contain the repeaters that amplify and correct the fibre transmissions to regenerate & boost those for the next hop. The DC power is fed into the active components, then the repeater's jointed to the armour wire, wrapped and lowered back to the seabed.
They're one of the fascinating bits of submarine cable systems. Like the limitation on the number of fibres carried. So a land-based cable would be 144 or 288f, but submarine only 8f, mainly due to the size & weight of the repeaters increases in line with the number of fibres. So more fibres, heavier repeater and then the strain that would put on the cable while it's being laid, or repeared, so a mechanical limit.
*Some systems might have multiple landing stations along it's route, so use branching units to drop out transmissions to those landing stations.
Biting the hand that feeds IT
