A hand-held, battery-powered tool, the VFF projects a highly visible red light into a fiber optic cable. The operator simply looks at the length of cable and where light is seen, there is a break. The VFF is equipped with a high-power, extra long-life, 650nm laser diode which operates either in Continuous (CW) or Modulated (MOD; 1Hz Pulse) mode. A push button allows the user to select the mode while preventing accidental operation. Any breaks will be seen as a conspicuously glowing or blinking red light area (in 3mm or smaller cables). A red LED on the outer case echoes the operation mode selected.
The VFF is useful over a distance of approximately 3km (2.3mi) into multimode fiber and 4km (2.5mi) into single mode fiber and can be used with single-mode and multimode cable. Use it as a stand-alone first-line basic troubleshooting tool, or in conjunction with an OTDR to pinpoint faults. The unit is packaged in a pocket-sized, rugged metal housing and is fitted with 2.5mm universal connector that accepts ST, SC and FC optical connectors. The VFF is also an excellent aide to technicians terminating mechanical splices or internal-splice style connectors where leaking light is an indicator of a poor fiber cleave or other misalignment.
Advanced fiber optic testing and troubleshooting capabilities are available with the FIBERTEK and TRACETEK accessory modules for the LANTEK 6/7G cable certifiers. FIBERTEK certifies fiber installations by measuring the attenuation and length of a pair of fibers simultaneously and generating printed certification reports. TRACETEK graphical display pinpoints faulty connectors and breaks in fiber optic cables at a fraction of the price of an OTDR.