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Single mode Fiber Optic Test Equipment Visual Fault Locator VFL to Check Fibers

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Single mode Fiber Optic Test Equipment Visual Fault Locator VFL to Check Fibers

Brand Name : FOCABLE
Model Number : Visual Fault Locator VFL650-5S
Certification : RoHS Compliant, ISO Certificate
Place of Origin : China
Payment Terms : Western Union, T/T
Supply Ability : 5000PCS/MONTH
Packaging Details : 1PCS/BOX
Type : Handheld
Wavelength(nm) : 650
Output power : 5mW, 10mW, 20mW, 30mW
Optical Connector : FC
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Fiber Optic Test Equipment Visual Fault Locator VFL to Check Fibers

General information

The Visual Fault Locator launches 650nm visible laser light into the fiber.

When the light encounters a break or sharp bend, it scatters, and the scattered light can be observed emerging from the cable. The Visual Fault Locator can locate breaks in short patch cords, which an OTDR cannot detect due to their operating dead zone. A fault locator is also much cheaper than an OTDR.

The Pen-type Visual Fault Locator can be operated in either continuous wave mode (CW mode) or in pulsed mode. Pulsed mode aids in locating faults under high ambient light conditions and improve battery life. It also could be used in checking connector quality. Often a connector may appears to be perfect. But inside the connector ferrule itself, poor gluing or dirty may create a microbend in the fiber. This microbend will produce excess insertion losses or return losses, and may result in premature failure of the connector. As the visual light launches through the fiber, it emerges from the connector in question, one can readily see

the distortion as a series of rings superimposed on a normal output. Bending or twisting the fiber may affect the overall intensity pattern, but not the ring pattern itself.


  1. Maintenance in telecom , CATV
  2. Test Lab of optical fibers
  3. Fiber routing and continuity checking in optical networks.
  4. Other fiber optic measurements


  1. Pen sized VFL fault locater & line tracer
  2. Single mode, multimode and plastic fiber applications
  3. Eye safe Class 1 device, no safety procedures required
  4. Rugged & simple fibre optic fault finder
  5. 2.5 & 1.25 mm universal connector options
  6. Pulsed or continuous laser options
  7. Useful in combination with an OTDR, to help exactly identify a fault


  1. Fiber breakage, bending failure location Fault check
  2. OTDR dead zone
  3. End-to-end optical recognition
  4. Mechanical connection point optimization

Technical Specifications



Central wavelength

650nm±10nm (635nm is available on request)

Emitter type


Output power





Laser Range





Optical connector

2.5mm universal connector, for 1.25mm connectors, FC (Male)-LC. (Female) convertor can be provided on request

Operating model

Both CW and Pulse available

Pulse frequency

2Hz to 3Hz/9Hz

Power supply

2AA alkaline batteries


AA alkaline battery

Operating temperature

-20°C to 60°C

Storage temperature

-40°C to 85°C




100g (without battery)

Standard Packages – Pen-type Visual Fault Locator




Main unit, User Manual

Fiber Optic Visual Fault Locator, Optical Fiber Visual Fault Locator, Handheld Fiber Visual Fault Locator, Bench-top Visual Fault Locator

Product Tags:

fiber optic test tools


fiber optic test and measurement

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