Acta Optica Sinica, Volume. 34, Issue 8, 806002(2014)
Implementation Method of a Frequency-Doubling Optoelectronic Oscillator
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.
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Liu Jingxian, Zhou Tao, Zhong Xin, Li Wenliang. Implementation Method of a Frequency-Doubling Optoelectronic Oscillator[J]. Acta Optica Sinica, 2014, 34(8): 806002
Category: Fiber Optics and Optical Communications
Received: Feb. 11, 2014
Accepted: --
Published Online: Jun. 24, 2014
The Author Email: Jingxian Liu (liujingxian1067@163.com)