When I was in school, I interned at a company that specializes in communication systems used to send data over these submarine cables. There is a huge market in terminal stations that send and receive over these cables. The terminal stations that communicate over the lines cost in the 50-100 million dollar range, but the cables themselves can cost upwards of a billion. Being able to maximize the efficiency of existing cables is a necessity.
A large factor for the efficiency, is how “thin” you can make channels in the cable via frequency of the light. Multiple signals can be sent over a single fiber line if they use different frequencies. One system I was working on at the time was constructing 88 channels at 100gbs for a total throughput of 8.8tbs.
Another very interesting aspect, is that service providers might share a lease of the same underwater cable, not actually owning the cable themselves. The companies enter an agreement on the frequency ranges assigned to them. Any mess ups in settings can cause disruption in your neighbor on the cable, resulting in millions of dollars of fines.
A large factor for the efficiency, is how “thin” you can make channels in the cable via frequency of the light. Multiple signals can be sent over a single fiber line if they use different frequencies. One system I was working on at the time was constructing 88 channels at 100gbs for a total throughput of 8.8tbs.
Another very interesting aspect, is that service providers might share a lease of the same underwater cable, not actually owning the cable themselves. The companies enter an agreement on the frequency ranges assigned to them. Any mess ups in settings can cause disruption in your neighbor on the cable, resulting in millions of dollars of fines.