Photonic Network Analyzer Based on Optical Sampling

A wideband photonic network analyzer (PNA) for microwave devices based on optical sampling is reported. Optical sampling is implemented to capture the response signals from devices under test for scattering parameter, sparing intricate procedures of down conversion in traditional electrical network analyzers. To validate the theoretical analysis, we establish an experimental PNA with a measurable frequency span up to 35 GHz, which can reach 100 GHz by applying a faster commercial modulator. Moreover, the scattering parameter magnitude of a 25 GHz low pass filter is measured by the established PNA. The experimental result is well consistent with that of a commercial network analyzer.