What is dark fiber

 The idea of dark fiber alludes to an optical fiber that was conveyed exploiting a work or some other explanation , and that isn't being used. The expression "dark" alludes to the fiber not being enlightened. 

Sending fiber optics is pricey, where a kilometer of link can cost around 300 euros . In the event that we increase the km of dark fiber that at present exists, we discover an expense of around 600 million euros at current costs in a fiber that is as of now not enlightened. Furthermore, that is considering just the expense of the link, since there are numerous others to consider, for example, work or materials. 

In particular, as per the most recent information for 2016, there is a sum of 2,121,641 km of dark fibre , the majority of which have a place with Red Eléctrica and Iberdrola, notwithstanding administrators, for example, Euskaltel or Vodafone. 

Estimate: why there are in excess of 2,000,000 kilometers of unused fiber 

Dark fiber isn't utilized more often than not , since its primary object isn't to serve end clients as is presently the situation. A significant number of these kilometers of fiber are utilized as a reinforcement or optional organization to have the option to utilize it if the principle one comes up short or is immersed, or to impart sporadically server farms with territories where reinforcements are made. 

Another case is that of the innovation stops that typically exist in urban areas, (for example, the PTA in Malaga). There, in its development it is set up with fiber optics since it is as of now arranged that the organizations will have an enormous progression of information , subsequently abstaining from completing works and presenting new cabling when another organization is introduced in the spot. 

Also, administrators regularly exploit a few organizations to present additional links that won't be utilized at first, however which they gauge will be required later on; either for a more prominent progression of clients , or to fulfill more noteworthy necessities of speed . They can likewise leave those links to exchange that organization to different administrators later on , or basically to offer private associations with organizations or organizations that need to have a moment and liquid organization between their workplaces. 

Telefonica, a couple of years back, had to encourage the entrance of its Internet channels to elective administrators to have the option to send their own links, since they had acquired an organization of many years. In the event that the utilization of these channels was not plausible, elective arrangements became an integral factor , including the utilization of this dark fiber .