Finisar provides fiber optic subsystems and network performance test systems. The company's products allow high-speed data communications over local area networks (LANs) and storage area networks (SANs). These subsystems convert electrical signals into optical signals for network and storage equipment manufacturers that develop and market systems based on Gigabit Ethernet and Fibre Channel (transmission protocols used in LAN and SAN applications). Its network performance test systems analyze traffic and identify problems. Customers include EMC and Cisco.