2023/06/27 by Alexander Schultze, Schultze, Alexander, Dennis Weise +5
Chemical Engineering · Chemistry · Engineering · #Analytical Chemistry and Sensors #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Photonic and Optical Devices #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2306.15738
openalex publication_date 2023/06/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The delay of photodetectors can be affected by intensity, reverse bias, and temperature through different effects. An optical pilot tone superimposed on the detectors allows the independent measurement of such phase errors in the complete photodetection chain and provides an opportunity to correct them. This allows further separate readout noise from the measurement, providing a more performant and intensity-invariant phase readout. We test the functional principle on a setup demonstrating an improved phase noise performance and a reduced phase walk below 10~mHz in particular. This benefits applications which require accurate timing or signal phase determination with photodiodes.