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为了扩展光电振荡器(OEO)的频率范围,设计了一种基于载波相移系统的二倍频OEO(FD-OEO)。系统采用相位调制器(PM)和Mach-Zehnder调制器(MZM)并联,构成载波相移系统,利用载波相移双边带(CPS-DSB)调制的方法产生二次谐波分量;同时利用啁啾光纤布拉格光栅(CFBG)色散特性实现边带分量与CPS补偿,维持OEO环路中基频信号的振荡。实验结果显示,在OEO环路系统基频信号为2.23GHz情况下,产生了4.30GHz的FD信号,且通过边模抑制性能、稳定性及相位噪声对系统性能进行了验证。
In order to extend the frequency range of the optoelectronic oscillator (OEO), a double-frequency OEO (FD-OEO) based on carrier phase shift system was designed. The system uses a phase modulator (PM) and a parallel Mach-Zehnder modulator (MZM) to form a carrier phase shift system, and generates a second harmonic component by carrier phase shift double sideband modulation (CPS-DSB) Fiber Bragg Grating (CFBG) dispersion characteristics to achieve the sideband component and CPS compensation to maintain the oscillation of the fundamental frequency signal in the OEO loop. Experimental results show that the FD signal of 4.30GHz is generated when the fundamental frequency of OEO loop system is 2.23GHz, and the performance of the system is verified by the side mode suppression performance, stability and phase noise.