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Your search keyword '"Wu, Ruihuan"' showing total 2 results
Start Over Author "Wu, Ruihuan" Topic microwaves
2 results on '"Wu, Ruihuan"'

1. High power flatness and wide spectrum range microwave frequency combs generation based on an actively mode-locked optoelectronic oscillator with intensity feed-forward path.

Author

Wang, Ziyang, Wu, Ruihuan, Li, Bo, Guo, Jianping, and Liu, Hongzhan

Subjects
*MICROWAVES, *PHASE noise, *POWER spectra, *CIRCADIAN rhythms
Abstract

• An actively mode-locked OEO with intensity feed-forward path is proposed to generate MFCs with high power flatness and wide spectrum range. • An intensity feed-forward path with the same delay as the main loop is introduced to realize signal power equalization. • Comb lines within ± 10 dB power variations increase from 15 to 78 and power difference decreases from 8.2 dB to 1.5 dB due to the use of intensity feed-forward technology. An actively mode-locked optoelectronic oscillator (OEO) with intensity feed-forward path is proposed and experimentally demonstrated to generate microwave frequency combs (MFCs) with high power flatness and wide spectrum range. An intensity feed-forward path with the same time delay as the delay of the main loop is inserted into an actively mode-locked OEO, which optimizes the power flatness and spectrum range of the generated MFCs signal. Experimental results show that comb lines within ± 10 dB power variations increase from 15 to 78 and power difference decreases from 8.2 dB to 1.5 dB when the intensity feed-forward path is working in the loop. Moreover, the performance of single sideband (SSB) phase noise with different lengths of SMF inserted in the proposed scheme are also investigated. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Nonlinear dynamics of the dual-loop optoelectronic oscillator based on polarization multiplexing.

Author

Zhang, Xiaohao, Li, Zhaozhao, Li, Bo, Wu, Ruihuan, and Hong, Weiyi

Subjects
*NONLINEAR oscillators, *NUMERICAL analysis, *MULTIPLEXING, *DYNAMICAL systems, *SYSTEM dynamics, *MICROWAVES, *PSYCHOLOGICAL feedback
Abstract

This paper focuses on the temporal dynamics of the dual-loop optoelectronic oscillator (OEO) based on polarization multiplexing. The delay-differential equation (DDE) for the dual-loop OEO system is presented for the first time. After employing microwave envelope method to simplify the DDE, the envelope signal equation describing the system dynamics is obtained. Stability analysis of the static solution of the envelope signal equation is also performed, and the gain thresholds for the system to exhibit various dynamic behaviours are calculated. Moreover, the proposed nonlinear dynamics approach reveals the stability of microwave envelope in detail as a function of the feedback gain and coupling coefficient, which indicates that there is not monotonously incremental relationship between envelope amplitude of the ultrapure microwave and the feedback gain. Finally, the experimental measurements confirm the results obtained from the theoretical and numerical analysis. • We develop a first-order envelope signal equation to descript the carrier-wave dynamics of a dual-loop OEO system. • We obtian the conditions for the occurrence of various dynamical behaviors of the system. • The experimental measurements confirm the results obtained from the theoretical and numerical analysis. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
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