Microwave pulse signal generation based on an active mode-locking optoelectronic oscillator by employing an electric mixer

Yulin Zhang; Zhenwei Fu; Zhen Zeng; Zhiyao Zhang; Yong Liu

doi:10.1117/12.3007722

21 December 2023 Microwave pulse signal generation based on an active mode-locking optoelectronic oscillator by employing an electric mixer

Yulin Zhang, Zhenwei Fu, Zhen Zeng, Zhiyao Zhang, Yong Liu

Author Affiliations +

Proceedings Volume 12966, AOPC 2023: AI in Optics and Photonics ; 129661T (2023) https://doi.org/10.1117/12.3007722
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

An active mode-locking optoelectronic oscillator (OEO) based on an electric mixer is proposed and experimentally demonstrated. In this scheme, the external drive signal is injected into the intermediate frequency (IF) port of the electric mixer to achieve the periodic loss modulation of the OEO cavity. Once the frequency of the drive signal is set to be equal to an integer multiple of the free spectral range (FSR) of the OEO, the phase between the longitudinal modes can be locked to generate the stable multi-tone microwave combs in the OEO cavity, which are coherently superimposed in the time domain to form the short microwave pulse signal with a repetition frequency equal to the frequency of the drive signal. In the experiment, the fundamental mode-locking and 50th -order mode-locking are realized in the proposed active mode-locking OEO, where the microwave pulse signals with the carrier frequency of 10 GHz, repetition rates of 98 kHz and 4.9 MHz, are generated. The phase noise at a frequency offset of 100 Hz is measured to be -94 dBc/Hz and -103 dBc/Hz for those two cases. Compared to the free-running OEO, the phase noise at 100 Hz frequency offset is reduced by 11 dB and 20 dB, respectively.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yulin Zhang, Zhenwei Fu, Zhen Zeng, Zhiyao Zhang, and Yong Liu "Microwave pulse signal generation based on an active mode-locking optoelectronic oscillator by employing an electric mixer", Proc. SPIE 12966, AOPC 2023: AI in Optics and Photonics , 129661T (21 December 2023); https://doi.org/10.1117/12.3007722

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KEYWORDS

Microwave radiation

Mode locking

Pulse signals

Repetition frequency

Optoelectronics

Harmonic generation

Modulation

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