Optical short-time Fourier transformation based on a bidirectional CFBG

Bowen Zhang; Tao Zhou; Jiaxin Xu; Shilong Pan; Dan Zhu; Aiping Xie; Xin Zhong; Zhiyu Chen; Minhui Long; Wenlin Bai

doi:10.1117/12.3032357

10 October 2024 Optical short-time Fourier transformation based on a bidirectional CFBG

Bowen Zhang, Tao Zhou, Jiaxin Xu, Shilong Pan, Dan Zhu, Aiping Xie, Xin Zhong, Zhiyu Chen, Minhui Long, Wenlin Bai

Proceedings Volume 13278, Seventh Global Intelligent Industry Conference (GIIC 2024); 132780S (2024) https://doi.org/10.1117/12.3032357
Event: Seventh Global Intelligent Industry Conference (GIIC 2024), 2024, Shenzhen, China

Abstract

A temporal convolution system for the short-time Fourier transformation (STFT) of an electrical signal based on a bidirectional chirped fiber Bragg grating (CFBG) is proposed and experimentally demonstrated. In this system, the electrical signal to be analyzed is applied to an electro-optical modulator to simultaneously modulate the temporal waveform and the spectrum of a time-stretched optical pulse, which is generated by a mode-locked laser and dispersed by a CFBG. The modulated optical signal is filtered to be several parts, added with separate time delays and sent to the other port of the same CFBG. Thus the optical signal is temporally recompressed and the spectrum of the electrical signal is able to be mapped into the time domain. The bidirectional CFBG realizes exactly complementary dispersion value for the optical pulse propagating in two opposite directions, which guarantees an optimal frequency resolution of the STFT system. An STFT experiment for a microwave signal with four different frequencies at 5 GHz, 10 GHz, 15 GHz and 20 GHz has been demonstrated.

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

Citation Download Citation

Bowen Zhang, Tao Zhou, Jiaxin Xu, Shilong Pan, Dan Zhu, Aiping Xie, Xin Zhong, Zhiyu Chen, Minhui Long, and Wenlin Bai "Optical short-time Fourier transformation based on a bidirectional CFBG", Proc. SPIE 13278, Seventh Global Intelligent Industry Conference (GIIC 2024), 132780S (10 October 2024); https://doi.org/10.1117/12.3032357

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