Global Dark Fiber Market Size, Share, and Growth & Trends Analysis By Fibre Type (Single Mode, Multi-mode, Step-index Multimode Fiber, Graded-index Multimode Fiber) By Material Type (Glass, Plastic) By Application (Telecom, Oil & Gas, Military & Aerospace, BFSI, Medical, Railway, Others) By Region (North America, Asia Pacific, Europe, Middle East & Africa, South America): Regional Outlook, Growth Potential and Segments Forecast 2024-2031