STFT Based on Stabilized Period-One Nonlinear Laser Dynamics and Stimulated Brillouin Scattering

A microwave photonic short-time Fourier transform (STFT) system based on stabilized period-one (P1) nonlinear laser dynamics and stimulated Brillouin scattering (SBS) is proposed. By using an optoelectronic feedback loop, the frequency-sweep optical signal generated by the P1 nonlinear laser dynamic...

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Bibliographic Details
Published in:IEEE photonics technology letters 2024-12, Vol.36 (24), p.1421-1424
Main Authors: Zhang, Sunan, Shi, Taixia, Jiang, Lizhong, Chen, Yang
Format: Article
Language:English
Subjects:
Adaptive optics
Bandpass filters
Bandwidth
Error analysis
Feedback loops
Fiber nonlinear optics
Fourier transforms
Lasers
microwave frequency measurement
Microwave photonics
Nonlinear dynamics
Nonlinear optics
Optical attenuators
Optical feedback
Optical fibers
Optical filters
Optical pumping
optoelectronic feedback
Optoelectronics
period-one nonlinear laser dynamics
Scattering
Short-time Fourier transform
stimulated Brillouin scattering
Time-frequency analysis
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Description
Summary:A microwave photonic short-time Fourier transform (STFT) system based on stabilized period-one (P1) nonlinear laser dynamics and stimulated Brillouin scattering (SBS) is proposed. By using an optoelectronic feedback loop, the frequency-sweep optical signal generated by the P1 nonlinear laser dynamics is stabilized, which is further used in conjunction with an optical bandpass filter implemented by SBS to achieve the frequency-to-time mapping of microwave signals and the final STFT. By comparing the results with and without optoelectronic feedback, it is found that the time-frequency diagram of the signal under test (SUT) obtained by STFT is clearer and smoother, and the frequency of the SUT measured in each frequency-sweep period is more accurate. The measurement error is reduced by around 50% under the optimal filter bandwidth.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2024.3486625