The Sidelighter™ locates and identifies faults and failures in fiber optic cables and connectors with an event resolution as low as 5 cm. The SidelighterTM connects directly to Anritsu’s Site MasterTM, VNA MasterTM, and ScorpionTM Vector Network Analyzers; Bird®’s Site Analyzer® family of Cable and Antenna Tester and Agilent’s Handheld Cable and Antenna Tester allowing any experience level user to perform both RF and optical distance-to-fault measurements in the field. The Sidelighter™ also works with many popular RF cable analyzers. The Sidelighter™ eliminates the “dead-zone” associated with optical time domain reflectometers (OTDRs). The Sidelighter™ is easily used in installations for troubleshooting and maintaining optical systems without the need to buy expensive OTDRs.