How to Measure Polarization Dependent Loss

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Polarization Synthesizer
+ Polarization Synthesizer
Polarization Synthesizer
+ Polarization Synthesizer

Characterize Polarization-Dependent Transmission

Polarization dependent loss testing measures how insertion loss changes as the optical polarization state varies through the device under test. The measurement uses a tunable optical source, controlled polarization state generation, and synchronized optical power measurements to compare transmitted optical power across multiple polarization states and calculate polarization dependent loss.

A test configuration must include polarization state control, optical signal routing, synchronized optical power acquisition, and wavelength sweeping to characterize polarization sensitivity. Engineers use the resulting measurements to evaluate optical filters, multiplexers, wavelength-selective devices, and other polarization-sensitive components by identifying maximum and minimum transmission conditions.

Polarization Dependent Loss Measurement Solution

Measuring polarization dependent loss requires controlled polarization states and synchronized optical power measurements to determine how insertion loss varies as polarization changes. The Keysight polarization dependent loss measurement solution combines a tunable laser, polarization synthesizer, optical multiport power meter, and optical switch to automate polarization state control, route optical signals, and capture repeatable power measurements across multiple polarization states. Together, these instruments characterize polarization sensitivity in optical filters, multiplexers, wavelength-selective devices, and other passive optical components while improving measurement repeatability and reducing manual test setup.
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Block Diagram of Polarization Dependent Loss Measurement Solution

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