基于相位调制的线性化微波光子链路

Linearized microwave photonic link based on phase modulation

针对微波光子链路在抑制三阶交调失真的同时不能消除二阶交调和二次谐波失真的问题,设计了一种基于相位调制的线性化微波光子链路。通过单边带(SSB)调制和平衡探测的方法,可有效抑制三阶交调、二阶交调与二次谐波失真,基频信号功率增大一倍且不存在色散效应。进行了理论分析研究并利用Optisystem进行了仿真实验,结果表明:相对于传统SSB相位调制的微波光子链路(MPL),该方案的SFDR提高了17dB。

In the previous structures, the third-order intermodulation, second-order intermodulation and the second harmonic distortions cannot be suppressed simultaneously. To overcome the above problems, a linearized microwave photonic link based on phase modulation is designed. The proposed link can suppressed the third-order intermodulation, second-order intermodulation and the second harmonic distortions simultaneously by using single-sideband modulation and balanced-photodetection. In addition, the power of the fundamental signal can be doubled, and the chromatic dispersion is also eliminated. The theoretical analysis is performed, and the simulated analysis is also carried out by employing Optisystem. The simulated results show that the SFDR of the proposed MPL is increased by 17 dB, comparing with the conventional SSB-phase-modulation MPL.