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为了进一步提高光电振荡器的实用性,提出了一种基于耦合型电增益环腔的小型化光电振荡器。利用电功分器和放大器构成电增益环腔,其梳状滤波效应可以有效对光电振荡器进行模式选择,结合直接调制半导体激光器,单模光纤和光电检测器,有效实现了小型化光电振荡器。理论上分析了电增益环腔的基本原理,并且通过仿真进行了验证。实验中获得了中心频率为12.624 GHz的微波信号,其相位噪声为-102 d Bc/Hz@10 k Hz。该方案在结构简单的条件下可以得到质量较高的射频信号,可以作为光电振荡器实用化的一种解决方法。
In order to further improve the practicability of the optoelectronic oscillator, a miniaturized optoelectronic oscillator based on a coupled electro-gain ring cavity is proposed. The electrical gain loop and the amplifier are used to form the electric gain ring cavity. The comb filtering effect can effectively select the mode of the optical oscillator. Combining the direct modulation of the semiconductor laser, the single mode optical fiber and the photodetector, the miniaturized optical oscillator . The principle of electric gain ring cavity is theoretically analyzed and verified by simulation. The microwave signal with the center frequency of 12.624 GHz was obtained and the phase noise was -102 d Bc / Hz @ 10 k Hz. The scheme can obtain RF signals with high quality under the condition of simple structure, and can be used as a practical solution of the photoelectric oscillator.