Global Linear-Variable Tunable Filters (LVTFs) Market By Type (Radar Systems , Testing and Measurement Systems , RF Amplifiers , Software-Defined Radios , Spectrophotometers , Avionics Communications Systems , and Surveillance Systems), By Application (Optical Channel Performance Monitoring , Optical Signal Noise Suppression , Missile Tracking , Light Detection and Ranging (LIDAR) , Hyperspectral Imaging , Wavelength Switching , and Signal Equalization), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029