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Determining the Polarization Response of the FPM-8220

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Determining the Polarization Response of the FPM-8220

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One of the fundamental specifications of any fiber optic component is how its transmission depends on input polarization. Even components viewed to be “polarization independent” have some level of Polarization Dependent Loss (PDL). The following table provides examples of typical maximum values for PDL for various fiber optic components.Polarization sensitivity can be directly measured by recording the transmission through the component using a polarization independent power meter while intentionally changing the state of polarization at the input. For accurate results, the Polarization Dependent Response (PDR) of the power meter being used should be much less than the PDL of the component being tested. The ILX Lightwave FPM-8220 Fiber Optic Power Meter and compatible FMH-8715 and FMH-87107 Fiber Optic Measurement Heads offer a very low PDR specified at less than ± 0.003dB. This Tech Note describes the test procedure and results for measuring the PDR of these products.

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