Velocity demodulation of near-field time-stretched photon Doppler velocimetry system uses Gerchberg–Saxton algorithm

Yue Zhao; Ying Cao; Guangwei Chen; Tengfei Wu; Ying Qin; Li Chen; Xiang Zhang; Zhiyong Zhang; Guoqing Hu; Shuang Zhao; Zhehai Zhou

doi:10.1117/12.3036196

22 November 2024 Velocity demodulation of near-field time-stretched photon Doppler velocimetry system uses Gerchberg–Saxton algorithm

Yue Zhao, Ying Cao, Guangwei Chen, Tengfei Wu, Ying Qin, Li Chen, Xiang Zhang, Zhiyong Zhang, Guoqing Hu, Shuang Zhao, Zhehai Zhou

Author Affiliations +

Proceedings Volume 13246, Quantum and Nonlinear Optics XI; 132461E (2024) https://doi.org/10.1117/12.3036196
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Conference Poster

Abstract

In the transient high-speed measurement scene, time-stretched dispersion Fourier transform technology is presented as an effective solution to reduce the bandwidth limit of electrical digital-to-analog conversion devices, which can realize the mapping from frequency domain to time domain by introducing sufficient amount of group time delay by dispersion elements, such as single-mode fibers. However, the introduction of long-distance single-mode fiber greatly reduce the intensity of optical signal. In our work, we introduce the Gerchberg-Saxton phase recovery algorithm into the velocity signal analysis to recover the interference signal from the two sufficient diversities incompletely stretched temporal envelope. The two envelopes are stretched by L₁=10 km and L₂=15 km single-mode fiber, which recorded with the dispersion D₁=180 ps/nm and D₂=270 ps/nm respectively. With the additional iterations, the phase error and magnitude tend to be stable, which are both below 0.3. We also compare the error of the algorithm under different dispersion ratios D(=D₁/D₂). The results show that the demodulated error will be affected by the change of the value of D. Our work lays a foundation for the subsequent debugging of the time-stretched photon Doppler velocimetry system, and also provides support for transient high-speed measurement.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Yue Zhao, Ying Cao, Guangwei Chen, Tengfei Wu, Ying Qin, Li Chen, Xiang Zhang, Zhiyong Zhang, Guoqing Hu, Shuang Zhao, and Zhehai Zhou "Velocity demodulation of near-field time-stretched photon Doppler velocimetry system uses Gerchberg–Saxton algorithm", Proc. SPIE 13246, Quantum and Nonlinear Optics XI, 132461E (22 November 2024); https://doi.org/10.1117/12.3036196

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