(800) 473-4237 / 508-992-6464 sales@focenter.com

Most likely, your testing specifications present minimum requirements for a Low IL and High RL.

If your production facility is challenged with meeting the desired IL/RL specs, there are common causes you can investigate and address.

However, before addressing common causes of poor IL/RL, let’s quickly explain the terms:

  • Insertion Loss (IL) – The loss of signal power resulting from inserting a device in an optical fiber. This can be referred to as attenuation and is usually expressed as a ratio, in dB, relative to the input power.
  • Return Loss (also called Back Reflection) – The reflection of signal power, usually resulting from inserting a device (such as a connector or other component) in an optical fiber path. Again, this is usually expressed as a ratio, in dB, relative to the input power.


Additional resources from the FOC team include:

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Kathleen Skelton

About Kathleen Skelton

Kathleen Skelton, as FOC's Director of Strategic Marketing, utilizes her expertise in business development, online strategy, market planning, digital best practices, standard operating procedure development, and content management. A graduate of Curry College, she holds degrees in Communications and Education, English and Psychology. Kathleen resides outside of Boston, MA with her husband and four children. Follow @KATHLEENSKELTON