Dr. Dongjian Li Profile

Dr. Dongjian Li

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Proceedings Article | 5 December 2024 Paper

Low noise carrier switchable microwave linear frequency modulation source based on external modulation method

JinHui Liu, Dongjian Li, Cunxiao Gao, Yu Hu, Zhenhua Hao, Jiansheng Chang

Proceedings Volume 13418, 134180L (2024) https://doi.org/10.1117/12.3045607

KEYWORDS: Microwave photonics, Modulation frequency, Frequency modulation, Microwave radiation, Laser frequency, Mode locking

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This paper proposes a scheme for generating microwave linear frequency modulation signals based on electro-optic external modulation. After electro-optic modulation, a single-frequency optical carrier signal generates a series of sidebands. By beating the sideband signal with a reference signal, a single-frequency microwave signal with a fixed carrier frequency can be generated. By replacing the modulation frequency with a sweep signal with a controllable frequency variation range and using a mode-locked pulse light as the carrier wave, a low-noise linear frequency modulation microwave signal output with switchable carrier frequency can be achieved. Through experiments, the carrier frequencies of the output signals reached 1.07 GHz and 5.35 GHz, the phase noise of the signals was lower than -101 dBc/Hz@10 kHz, and the signal-to-noise ratio was higher than 27 dB. The experimental results show that high-performance linear frequency modulation microwave signal output with different carrier frequencies, low noise, and stable phase relationship can be achieved.

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