Global Optical Data Communication Market By Type (Wavelength Division Multiplexing (WDM), Synchronous Optical Networking (SONET), Synchronous Digital Hierarchy (SDH), and Fiber Channel), By Application (Aerospace and Defense, Government, Industrial, Transportation, Energy and Power, Telecom, and Telecom), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028