The Sidelighter™ locates and identifies faults and failures in fiber optic cables and connectors with an event resolution as low as 10 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.