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Complete model identification for measuring photodetector's data age in high-speed and high-precision interferometry
Optics Express
|April 12, 2025
Summary
Accurately measuring photodetector data age is crucial for high-speed interferometry. This study introduces a new method to precisely determine data age, improving synchronization and dynamic calibration accuracy.
Area of Science:
- Optoelectronics
- Metrology
- Signal Processing
Background:
- Data age in photodetectors is critical for high-speed and precision interferometry.
- Accurate measurement ensures timely control in dynamic calibration and high-speed movement synchronization.
- Existing methods struggle to simultaneously model phase shifts and time delays, limiting accuracy.
Purpose of the Study:
- To develop a complete model identification method for accurate photodetector data age measurement.
- To integrate nonlinear phase and fixed delay into a comprehensive model.
- To enhance the precision of data age determination in interferometric systems.
Main Methods:
- Analysis of laser impulse response sequences.
- Application of Hankel matrix and phase spectrum techniques.
- Development of a complete model identification approach incorporating nonlinear phase and fixed delay.
Main Results:
- Achieved 95% model reliability.
- Obtained a measurement uncertainty of 51 ps (k=2) for a 400 MHz bandwidth photodetector.
- Demonstrated a more accurate measurement of photodetector data age.
Conclusions:
- The proposed method accurately measures photodetector data age by integrating nonlinear phase and fixed delay.
- This advancement offers potential for compensating non-real-time and nonlinear errors in interferometry.
- Improved data age measurement enhances the performance of high-speed and high-precision interferometric systems.
