- Finisar Corporation (NASDAQ: FNSR) is a global technology leader for fiber optic subsystems and components that enable high-speed voice, video, and data communications for telecommunications, networking, storage, wireless, and cable TV applications. For 25 years, Finisar has provided critical optics technologies to system manufacturers to meet the increasing demands for network bandwidth. Finisar is headquartered in Sunnyvale, California, USA with R&D, manufacturing sites, and sales offices worldwide.