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Home Products Fiber Optic Test&Cleaning Tool Visual-Fault-Locator 650nm Visual Fault Locator


650nm Visual Fault Locator
650nm Visual Fault Locator

650nm Visual Fault Locator

Product ID : YSC004-VFL
Product Tags :
Product Description

650nm Visual Fault Locator


  This Pen-type VFL is specially designed for field personnel who need an efficient and economical tool for fiber tracing, fiber routing and continuity checking in optical networks. It finds breakpoints, poor connections, bending or cracking in fiber optic cables; and it can find faults in an OTDR dead zone and is used for end-to-end visual fiber identification.  


Maintenance in telecom, CATV

Test Lab of optical fibers

Fiber routing and continuity checking in optical networks

Other fiber optic measurements


1.25mm and 2.5mm universal connector, adaptor also

can be provided on request

Operates either in CW or Pulsed mode with constant

output power

Low battery warning

Long battery life (up to 60 hours)

Drop-resistant and dust-proof design of laser head

Laser case ground design prevents ESD damage

Portable and rugged

Easy to use

Product Description

  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

locates breaks in short patchcords, which an OTDR cannot detect due to their

operating dead zone. A fault locator is also much cheaper than an OTDR.

However, they are not recommended for using with dark-colored or armored


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





Central wavelength

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

Emitter type

FP-LD (珀罗激光二极管)

Output power





Laser Range





Optical connector

2.5mm or 1.25mm Universal connector

Operating model

Both CW and Pulse available

Pulse frequency

2Hz to 3Hz


2AA alkaline battery

Operating temperature

-20°C to 60°C

Storage temperature

-40°C to 85°C




170g (without battery)


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