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Notas de Aplicação
Fiberoptic polarization controllers are an important part of many measurement configurations. Generally, they can provide variation of the optical signal polarization to a device under test (DUT) or set specific states of polarization (SOP). But the settings of the controller alone are rarely sufficient to know the polarization of the signal with respect to the axes of the device, such as the TE or TM orientations of a photonic integrated circuit (PIC) chip or wafer. One source of this uncertainty is the polarization change within the fiber connection to the device and another can be changes to the polarization of the signal input to the controller. These changes are generally also dependent on wavelength and vary over time or with temperature.
This note describes several methods, depending on the instrument and the application, for aligning the polarization to the device axes, using advanced functionality of the Keysight polarization controllers. This updated version includes useful functionality added with version 3.0 firmware as well.
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