Fiber Optic Preform Market Size and Forecasts (2020 - 2030), Global and Regional Share, Trends, and Growth Opportunity Analysis Report Coverage:by Process (OVD, VAD, PCVD, MCVD); Product Type (Single-Mode Fiber Optic, Multi-Mode Fiber Optic, Plastic Optical Fiber); End-user (Telecom, Oil and Gas, Military and Aerospace, BFSI, Medical, Railway, Others) , and Geography (North America, Europe, Asia Pacific, and South and Central America)