Backhaul Research Note: FSO backhaul innovations
When talking about backhaul, fiber is always the best alternative in terms of throughput. However, deploying fiber specifically for every site if it is not already available is very expensive. This is true of both macrocells and metrocells, but the issue is more pressing for the latter, because of the lower revenue that each additional site represents for the mobile operator. So, if fiber is not easily available, then using a wireless backhaul technology is the alternative.