Infrared and Laser Engineering, Volume. 52, Issue 9, 20220913(2023)
Performance analysis method of high-precision event timer in laser time-frequency transmission
Figures & Tables(12)
Fig. 1. Corresponding slope characteristics of noise processes under power-law spectral density
Fig. 4. Schematic diagram of event timer frequency and phase calculation based on continuous counting
Fig. 5. GT668 measures the clock difference phase data and frequency data. (a) Phase data; (b) Frequency data (The vertical axis of Figure (a) indicates the fixed delay (unit: s), and The vertical axis of Figure (b) depicts the frequency data (unit: rad/s), which is the derivative of the instantaneous phase to time)
Fig. 6. Comparison of frequency accuracy and frequency drift rate between A033 and GT668. (a) Frequency accuracy; (b) Frequency drift rate
Fig. 7. Comparison of time domain variance between A033 and GT668. (a) Allan curve graph; (b) Modified Allan curve graph; (c) Time curve graph; (d) Hadamard curve graph （The horizontal axis shows the logarithmic value of the corresponding time, while the vertical axis shows the logarithmic value of the associated variance）
Fig. 8. Five power law spectral noises comparison between A033 and GT668
Table 1. Specification comparison of A033 and GT668
View tableView in ArticleTable 1. Specification comparison of A033 and GT668
Specifications GT668 TIA A033-ET Single-shot RMS resolution/ps 0.9 1-1.5 Maximum measurement rate (million events per second) 4 1 Pulse width/ns >0.15 5-40 (channel-to-channel crosstalk) Dead time/ns 50+
Table 2. Statistical results of A033 and GT668
View tableView in ArticleTable 2. Statistical results of A033 and GT668
Statistical value A033 GT668_1 GT668_2 Root mean square/×10−7 1.94439 2.02198 2.02201 Mean value SE/×10−14 3.65572 1.34935 2.60617 Standard deviation/×10−12 6.07411 3.04727 4.20232 Extreme difference/ps 46 26 29
Table 3. Comparison of frequency accuracy and drift rate results
View tableView in ArticleTable 3. Comparison of frequency accuracy and drift rate results
Event timer Frequency accuracy/ $ \times {\text{1}}{{\text{0}}^{{{ - 12}}}}$ Frequency drift rate/ $ \times {\text{1}}{{\text{0}}^{{{ - 15}}}}$ A033 Final value −2.075 1 day 2.096 RMS value 6.073 GT668 Final value 0.947 1 day −1.071 RMS value 3.100
Table 4. Numerical comparison of stability results between A033 and GT668 (×10−12)
View tableView in ArticleTable 4. Numerical comparison of stability results between A033 and GT668 (×10−12)
Time domain deviation A033 GT668_1 GT668_2 Allan deviation 7.260 4.108 4.570 Modified Allan deviation 8.908 4.977 5.771 Time deviation 5.143 2.874 3.331 Hadamard deviation 9.403 5.203 6.225
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Han Xue, Ziang Zhang, Jingqi Fu, Lingtian Diao, Liwei Mu. Performance analysis method of high-precision event timer in laser time-frequency transmission[J]. Infrared and Laser Engineering, 2023, 52(9): 20220913
Paper Information
Category: Lasers & Laser optics
Received: Dec. 30, 2022
Accepted: --
Published Online: Oct. 23, 2023
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