Work

Complete model identification for measuring photodetector’s data age in high-speed and high-precision interferometry

Year: 2025

Type: article

Abstract: Data age in photodetectors is a key indicator in high-speed and high-precision interferometry. Accurately measuring it is essential for ensuring timely control of high-speed movement and synchronization in dynamic calibration. Current methods for measuring photoelectric data age are limited by their inability to simultaneously account for phase shifts and time delays, primarily due to incomplete models. This study introduces a complete model identification method that integrates nonlinear phase and fixed delay, providing a more accurate measurement of the photodetector's data age. By analyzing laser impulse response sequences with Hankel matrix and phase spectrum, the proposed method achieves 95% model reliability and a measurement uncertainty of 51 ps (k = 2) for a photodetector with 400 MHz bandwidth. This work has significant potential to compensate for non-real-time and nonlinear errors in interferometry.

Source: Optics Express

DOI: 10.1364/oe.550721

Authors: Yunke Sun, Zhaoyang Zhang, Xu Xing, Pengcheng Hu, Jiubin Tan

Language: English

Topic: Advanced Measurement and Detection Methods

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Key Research and Development Program of China

Award: G8973097117