Even in the midst of current fiber network rollouts, research and development is continuing on the next generation of optical technology, looking to meet the future fiber bandwidth needs of both FTTH and core fiber networks. In this blog I’m going to look at multicore networks, an area where current research could have a big potential impact on future network design and implementation.
The space paradox
It may come as something of a surprise, but the majority of the optical fiber within networks is quite literally a waste of space! Even more bizarrely, the most modern fibers are the biggest waste of space of all.
This paradox arises because of the way fibers transmit the signal they are fed. It is the relatively small core (central portion) of the fiber that carries the information in the network. The remainder of the fiber (the cladding) is there to provide protection and to bulk up the fiber sufficiently that our clumsy human hands can manipulate it. In the case of earlier, multimode fibers with a 62.5 micron core (and 125 micron cladding diameter), 25% of the cross section area of the fiber is used for signal transmission. This decreased to just 16% of the cross sectional area for 50 micron core multimode fiber and now, in the current G.675C fibers, less than 0.5% of the glass cross section is actually used to carry the signal.