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Return Loss is a measure of the relative power reflected back from a splice, connection, or defect in the fiber. In the early days, this was a big problem. Lasers could be destabilized by power coming back at them, and analog video would suffer ghosts. This is largely a thing of the past, and measuring RL is something of a historical remnant. In fact – and it may be controversial to say this – measuring Return Loss is no longer critical.

Today, good (high) RL numbers are regarded as a mark of quality. If a connector shows poor RL, it may still perform adequately, but this indicates something is not quite right with the process. If you are not getting high RL measurements, I encourage you to investigate your production process. Also, it’s possible that good RL may contribute to long-term reliability, although I don’t have concrete evidence to support this.


READ THE BLOG: How to Accurately Measure IL/RL


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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