How to Identify the Fiber Optic Link Problems ?

1

• The following steps are taken during the
  identification of fiber optic link problems with
  the visual fault locator.
• An Overview of Fiber Optic Visual Fault Locator
• A visual fault locator is a pen-like device that
  works with a laser and is designed to locate
  errors on a fiber link. It can be used to
  analyze the fiber network at locations such as
  splice points, connector link, and across the
  entire length of fiber cable. It can be used in a
  continuous laser detection mode or in flash
  mode, depending on the type of analysis being
  performed.
• The visual flaw detector can only be used on
  fiber optic solutions in the field. Therefore,
  the first step is to test the transaction point
  by directing the laser pointer towards the
  connection location. The transaction point is
  where the connector meets the cable. Identify
  the presence of external optical energy, if any.
  If there is no external influence, test the
  splice connection. Check if the cable is spliced
  incorrectly, if not, find the following
  location.
• Slide the visual fault locator along the fiber
  cable. However, experienced fiber optic network
  testers can use a logical approach to locate a
  potential area of failure. Otherwise, the cable
  must be thoroughly tested. Along the entire
  length, check for fiber cuts, loss of signal
  intensity, etc.
• If loss of signal strength is identified in one
  location, the fiber should be tested for another
  20 to 30 miles. If signal break traces cannot be
  indicated with the fault locator, the use of a
  time domain reflectometer may be required in
  extreme cases.