What is the origin of Dark Fiber?

 Ventures to send fiber optic networks are exceptionally high, given the extraordinary exertion included, broadcast communications organizations will in general introduce overestimating the measure of link required, leaving a level of them unused. For what reason is this done? Fundamentally for 2 reasons: 

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1. Future figure: 

Innovation consistently advances and requests more speed. Conveying a bigger number of links than should be expected permits later on to exploit them to enact more administrations or more noteworthy limit and, it can likewise be helpful to initiate repetition ways. 

2. Advertising to outsiders: 

Dark fiber opens up another help choice for broadcast communications clients and administrators, who can rent these links as a selective rapid, secure and private association.