Journal of Applied Optics, Volume. 46, Issue 1, 62(2025)
Injection locking effect based on coupled optoelectronic oscillator
A theoretical model of coupled optoelectronic oscillator (COEO) based on injection locking was proposed. The frequency response of the injection-locked COEO was obtained by viewing the optical fiber loop and the injection-locking effect as two cascaded bandpass filter, and the influence of the injection-locking effect on the output characteristics of the COEO was analyzed. In the experiment, the dynamic output range of the COEO under injection-locked conditions was determined by simulating frequency detuning conditions with the help of a tunable optical delay line. The output signal quality of the COEO under injection-locked conditions was investigated by adjusting the signal generator for different injection signal strengths. Under the conditions of injection signal strength of ?15 dBm, the generated side-mode rejection ratios of microwave signal is 59 dB. The phase noise of the injection-locked COEO at near from the carrier signal is ?124.1 dBc/Hz@10 kHz, the spurious mode suppression ratio is 39.3 dB at far from the carrier signal, and the frequency drift is controlled within 15 mHz. When the injected signal strength is ?12 dBm, the generated side-mode rejection ratios of microwave signal is 66 dB. The phase noise of the COEO at near from the carrier signal is ?117.6 dBc/Hz@10 kHz, the spurious mode suppression ratio is 41.2 dB at far from the carrier signal, and the frequency drift is 10 mHz.
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Jingkai ZHANG, Deqi LI, Tianqi ZHAO, Hongbo LOU, Jiawei ZHENG, Xianzhu LIU, Tianshu WANG. Injection locking effect based on coupled optoelectronic oscillator[J]. Journal of Applied Optics, 2025, 46(1): 62
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Received: Feb. 19, 2024
Accepted: --
Published Online: Apr. 1, 2025
The Author Email: Tianshu WANG (王天枢)