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Optical pilot tone correction of phase errors in photodetection chains.
Applied Optics
|December 18, 2023
Summary
An optical pilot tone corrects phase errors in photodetectors, improving phase readout performance and intensity invariance. This method enhances timing accuracy for photodiode applications.
Area of Science:
- Optoelectronics and Photodetection
Background:
- Photodetector phase delay is influenced by intensity, reverse bias, and temperature.
- Accurate phase determination is crucial for timing-critical applications.
Purpose of the Study:
- To introduce a method for independent measurement and correction of phase errors in photodetection.
- To enhance the performance and intensity invariance of phase readout.
Main Methods:
- Superimposing an optical pilot tone onto the detected signal.
- Utilizing the pilot tone for independent phase error measurement within the photodetection chain.
Main Results:
- Demonstrated improved phase noise performance in an experimental setup.
- Achieved reduced phase walk below 10 mHz.
- Enabled separation of readout noise from the phase measurement.
Conclusions:
- The optical pilot tone method effectively corrects photodetector phase errors.
- This technique offers a performant and intensity-invariant phase readout.
- Beneficial for applications demanding precise timing and phase determination with photodiodes.
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