Dark Fiber (or Dark Fibre) refers to unused fiber-optic cable that is currently available for use; or in other words excess network capacity. In many cases ISPs or broadband providers would build excess fiber capacity, based on efficiency gains during engineering and construction. That excess capacity (or Dark strands) can then be sold or leased to future clients who need connections from a network service provider.
If you are looking for some basics about Dark Fiber, what it is, and why it matters, check out these articles.
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