Polarization Extinction Ratio Measurement Methods and Applications

Polarization extinction ratio (PER), a measure of the degree to which light is confined in a principal linear polarization mode, is an important performance parameter for many lasers and for PM fiber components and systems.

In addition to its use in characterizing finished components, PER measurement is necessary for active alignment of PM connectors. Common methods for measuring PER have different capabilities and limitations.

An understanding of the differences can help in selecting the best method and instrument for a particular application. Our new Application Note provides a comparison of the three methods and the recommended applications.