Stepped-Frequency Microwave Waveform Generation Based on a Fourier Domain Mode-Locked Optoelectronic Oscillator

We propose and experimentally demonstrate an approach to generating a stepped-frequency microwave waveform (SFMW) with a large time-bandwidth product (TBWP) based on a modified Fourier domain mode-locked optoelectronic oscillator (FDML-OEO). A uniformly stepped-frequency optical carrier is generated...

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Bibliographic Details
Published in:IEEE photonics technology letters 2024-03, Vol.36 (5), p.305-308
Main Authors: Li, Lingzhi, Chen, Jingxu, Zhang, Jiejun, Yao, Jianping
Format: Article
Language:English
Subjects:
Bragg gratings
Light sources
Microwave photonics
Mode locking
Optical frequency
Optoelectronics
Oscillators
Tuning
Waveforms
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Summary:We propose and experimentally demonstrate an approach to generating a stepped-frequency microwave waveform (SFMW) with a large time-bandwidth product (TBWP) based on a modified Fourier domain mode-locked optoelectronic oscillator (FDML-OEO). A uniformly stepped-frequency optical carrier is generated by an optical frequency-shifting loop (FSL), which is used as a light source of the FDML-OEO. The joint operation of the stepped-frequency optical carrier generator, a phase modulator (PM), a phase-shifted fiber Bragg grating (PS-FBG), and a photodetector (PD) in the FDML-OEO forms a tunable microwave photonic filter (MPF), with the tuning interval being identical to the step duration of the stepped-frequency optical carrier. When the round-trip time of the OEO is equal to an integer multiple of the tuning interval of the MPF, Fourier domain mode-locking is achieved, and an SFMW is generated. The operation of the proposed SFMW generator is experimentally evaluated. An SFMW with a large TBWP of [Formula Omitted] is generated.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2024.3351489