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Optical Return Loss Testing-Ensuring High-Quality Transmission

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Optical Return Loss Testing-Ensuring High-Quality Transmission

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  • Author: Francis Audet
As communication technologies and dense wavelength-division multiplexing (DWDM) systems evolve rapidly, measuring optical return loss (ORL) is a growing concern. High bit rates in digital fiber-optic transmission systems and networks continue to increase. The good news is that, in the past few years, we have witnessed the industry gain valuable experience in this area. In addition, the importance of ORL testing has also been getting the recognition it deserves. In this application note, we will briefly review the role of optical return loss testing and demonstrate how leading service providers use ORL testing to their benefit. We will also clarify the significant differences between true ORL measurements and optical timedomain reflectometer (OTDR) backreflection results.

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