OLS4 Quad Source is an integrated two-port LED (850 and 1300 nm) and laser (1310 and 1550 nm) light source designed for performing insertion loss measurements on multimode or single-mode fiber optic links. Each port can transmit highly stabilized output (single or dual wavelength) to ensure accurate loss test results per current TIA/EIA requirements. Equipped with industry standard 2 kHz test tone, the OLS4 from AFL is an ideal tool to pair with an optical fiber identifier (OFI-200D OFI-400) for use in fiber identification.