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Zhong X.,Key Laboratory of Electronic Information Control | Wang Y.,Key Laboratory of Electronic Information Control | Li W.,Key Laboratory of Electronic Information Control | Liu J.,Key Laboratory of Electronic Information Control | Yang Z.,Beijing University of Technology
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2015

The theoretical model of optical frequency comb based on cascaded intensity modulator and phase modulator was established. The relationship between the flatness of optical frequency comb and the offset point of IM (βIM), the modulation coefficient of IM (χIM), and the phase difference of driving signals of IM and PM (ΔΦ) was analyzed. The results show that the optimum values of ΔΦ are multiples of π and independent from other parameters. Meanwhile, the optimum values of βIM and χIM are linearly correlated. With the number of the comb teeth increasing, the optimum value of χIM moves toward 0, and the optimum value of βIM moves toward π accordingly. ©, 2015, China National Publishing Industry Trading Corporation. All right reserved. Source


Chen J.,Key Laboratory of Electronic Information Control | Hui Y.,Key Laboratory of Electronic Information Control | Yan B.,Key Laboratory of Electronic Information Control | Chen S.,Key Laboratory of Electronic Information Control
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

A novel optoelectronic oscillator with multiple long fiber loops is proposed. This oscillator can simultaneously have lower phase noise and higher side mode suppression ratio than current multiloop optoelectronic oscillators. A three-fiber-loop oscillator with more than 4 km fiber length is investigated in theory and experiment. The optoelectronic oscillator with frequency of 10 GHz, phase noise of -130 dBc/Hz at 10 kHz offset, and side mode suppression ratio of 60 dBc is demonstrated. The agreement of experimental results and theoretcal analysis justifies this method. Source


Liu J.,Key Laboratory of Electronic Information Control | Zhou T.,Key Laboratory of Electronic Information Control | Zhong X.,Key Laboratory of Electronic Information Control | Li W.,Key Laboratory of Electronic Information Control
Guangxue Xuebao/Acta Optica Sinica | Year: 2014

A frequency-doubling optoelectronic oscillator using the nonlinear effect of the electro-optical modulator is proposed. By introducing a frequency divider, it is possible to produce frequency-doubling microwave signal with high frequency using low frequency modulator. Therefore, the requirement for high frequency modulator is weakened. Theoretical and experimental results show that, when the input microwave power is low, the modulator can introduce large additional noise, which severely deteriorates the phase noise of the optoelectronic oscillator. By introducing another microwave amplifier in the feedback path to reduce the additional noise, the phase noise of the frequency-doubling signal can be largely improved. When the fiber length is 1 km, the phase noise of the frequency-doubling signal is -104 dBc/Hz at 10 kHz frequency offset from 9 GHz, which is 6 dB worse than the conventional optoelectronic oscillator. Meanwhile, the output power is remained. The agreement of experimental results and theoretical analysis justifies the feasibility of this method. Source

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