The product adopts the architecture of test module + handheld universal test platform, integrating OTDR, visual fault location, optical power meter, light source and other applications. It can expand the end detection function, which can realize multi-pulse width test + . An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize, troubleshoot and maintain optical networks. OTDR testing is done by injecting a series of optical pulses into the fiber under test, and characterizing the scattered or reflected light. CWDM OTDR-family optical performance, combined with the T-BERD®/MTS platform's suite of testing features, ensures that testing jobs are performed right—the first time.