What is the difference between fiber and dark fiber?

Related questions

1. What is channel spacing in DWDM?
2. What is DWDM and CWDM?
3. Why is it called dark fiber?
4. What is dark fiber network?
5. What are the disadvantages of Fibre optic cable?
6. What is DWDM network?
7. What is the maximum distance for fiber optic cable?
8. What is dark fiber and lit fiber?
9. What is a CWDM mux?

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8. #control
9. #fiber
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11. #networks
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15. #equipment
16. #waves
17. #infrastructure