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光电振荡器(OEO)是当前热门的一个研究问题,频率可调谐是它的一个重要性能指标。目前,频率可调谐的步长比较大,较好的也只能达125 MHz左右,还处于粗调谐水平。通过实验验证了一种基于电移相器实现的可精细调谐的OEO。该方案通过调节电移相器的偏置电压,改变环腔中振荡频率的相位,等效于改变环腔时延,最终实现环腔振荡频率的改变。由于移相器的相移量可以通过偏置电压进行细微调整,所以可以实现环腔振荡频率的精细调谐。实验中使用最大相移量为180°的电移相器实现了10.020~10.025GHz约5.5 MHz范围内步长约为70kHz的精细可调谐。
Optical oscillator (OEO) is currently a hot research issue, and its frequency tuning is an important performance index. Currently, the frequency tunable step size is relatively large, better only about 125 MHz, is still at the coarse tuning level. An experimentally verified OEO that can be finely tuned based on the electrical phase shifter. By adjusting the bias voltage of the electrical phase shifter, the scheme changes the phase of the oscillation frequency in the ring cavity, which is equivalent to changing the delay of the ring cavity and finally realizing the change of the ring cavity oscillation frequency. Since the amount of phase shift of the phase shifter can be finely adjusted by the bias voltage, fine tuning of the ring cavity oscillation frequency can be achieved. Experiments using a maximum phase shift of 180 ° of the electrical phase shifter to achieve 10.020 ~ 10.025GHz about 5.5 MHz range of about 70kHz fine tunable.