论文部分内容阅读
针对光电振荡器(OEO)系统,设计了一种可实现滤波功能的串联耦合双循环延时线(SCDRDLs),并与放大自发辐射(ASE)宽带激光源、Mach-Zehnder调制器(MZM)、偏振分束器(PBS)相结合形成微波光子滤波器(MPF)。利用结构中ASE宽带激光源相干时间小于SC-DRDLs固有延时的特性,实现MPF的非相干性。同时SC-DRDLs的双循环延时线级联特性,决定系统具有大的自由频谱范围,再结合其双输出端口与PBS形成的双环结构,完成系统的高边摸抑制性能。理论分析和实验结果表明,本文系统能产生高频谱纯度、长期稳定性和低相位噪声的微波信号;通过改变SC-DRDLs的环长,可对MPF进行重构,进而调谐振荡频率。
For the optoelectronic oscillator (OEO) system, a series coupled double-cycle delay line (SCDRDLs) that can realize the filtering function is designed and compared with the amplification of ASE broadband laser source, Mach-Zehnder modulator (MZM) Polarizing beam splitters (PBSs) combine to form a microwave photonic filter (MPF). The non-coherence of MPF is realized by using the characteristic that the coherence time of ASE broadband laser source in the structure is smaller than the inherent delay of SC-DRDLs. At the same time, SC-DRDLs dual-cycle delay line cascades the characteristics of the decision system has a large free spectral range, combined with its dual-output port and the formation of a double-ring PBS structure to complete the system’s high-side touch suppression performance. Theoretical analysis and experimental results show that the proposed system can generate microwave signals with high spectral purity, long-term stability and low phase noise. By changing the loop length of SC-DRDLs, MPF can be reconstructed and the oscillation frequency can be tuned.