Circadiant Systems, Inc. manufactures optical test systems for optical component developers, network equipment manufacturers, and telecom service providers. The company offers electrical/optical compliance system for module, host card and IC testing applications, HYDRA LRM-M that solves the issues of calibration, instrument drift, and system-to-system correlation that can normally slow product release, HYDRA MTS that solves the issues of calibration, instrument drift, and system-to-system correlation that normally slow design cycles, and optical standard tester-ST that accurately generates various optical impairments, including optical signal-to-noise ratio, as well as automates performance and conformance testing of 10 Gb/s devices and systems. It also provides OSS-RW that offers creation of different optical impairments for testing performance of 10 Gb/s devices, OST-SRS provides stressed receiver sensitivity conformance testing of 10 gigabit Ethernet devices, and A3318 that enables the OST to make stressed eye measurements. In addition, it offers long reach multimode solutions that offer a scant 100m coverage with conventional 850nm optics, protocol layer testing, electronic dispersion compensation testing, and system level testing solutions.