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为了有效实现光电振荡器(OEO)输出频率精细调谐,提出了一种基于电增益环腔(EGRR)的OEO。利用放大器、滤波器和移相器构成可调谐EGRR,通过改变EGRR内信号的相位等效实现环腔长度的改变,得到不同频率的射频(RF)信号,RF信号与OEO产生的自由振荡信号电注入锁定,输出信号的频率由锁定EGRR输出频率的OEO模式决定,相位噪声由OEO决定。在简单结构实验的条件下,有效实现了OEO输出频率精细调谐。实验结果表明,当光纤长为2km、EGRR长为0.5m时,得到了频率为11.3GHz、边模抑制比(SMSR)为48dB、可调谐范围为239MHz、调谐最小步长为100kHz和相位噪声为-99dBc/Hz@10kHz的RF信号。
In order to realize the fine tuning of OEO output frequency effectively, an OEO based on electric gain ring cavity (EGRR) is proposed. A tunable EGRR is formed by an amplifier, a filter and a phase shifter. The ring cavity length is equivalently changed by changing the phase of the signal in the EGRR to obtain a radio frequency (RF) signal with different frequencies. The RF signal and the free oscillation signal generated by the OEO Inject Lock, the frequency of the output signal is determined by the OEO mode that locks the EGRR output frequency, and the phase noise is determined by OEO. Under the condition of simple structure experiment, the output frequency of OEO is effectively tuned. The experimental results show that when the optical fiber length is 2km and the EGRR length is 0.5m, the frequency is 11.3GHz, the side mode suppression ratio (SMSR) is 48dB, the tunable range is 239MHz, the tuning minimum step is 100kHz and the phase noise is RF signal of -99dBc / Hz @ 10kHz.