An Overview of Polarization Extinction Ratio Measurement Methods
Polarization extinction ratio (PER) is a measure of the degree to which light is confined in a principal linear polarization mode. It is defined as the ratio of the power in the principal polarization mode to the power in the orthogonal polarization mode after propagation through a device or system, expressed in dB. There are several methods of measuring PER. The most suitable method depends on the application.