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为改善微波光子链路的动态范围,提出了一种基于双波长双并联调制的线性化方法。仿真分析了激光器输出光功率漂移对该线性化链路无杂散动态范围的影响,结果显示基于现有的商用器件即可实现该线性化方法。此外,实验对比了单调制器基本链路和双波长双并联调制线性化链路的性能。实验结果显示,线性化后,链路的压缩动态范围提高了1.5 d B,无杂散动态范围提高了15.6 d B,其中无杂散动态范围可达到122.5 d B·Hz4/5。该线性化方法简单、易实现,为光链路动态范围要求较高的应用领域提供了一种很好的解决方案。
In order to improve the dynamic range of microwave photonic chain, a novel linearization method based on dual wavelength parallel modulation is proposed. The influence of laser output optical power drift on the spurious-free dynamic range of the linearized link is simulated and analyzed. The results show that this linearization method can be realized based on the existing commercial devices. In addition, the experiment compares the performance of single modulator basic link and dual wavelength dual parallel modulation linearization link. The experimental results show that after linearization, the compression dynamic range of the link is increased by 1.5 d B, the spurious dynamic range is increased by 15.6 d B, and the spurious free dynamic range is 122.5 d B · Hz4 / 5. The linearization method is simple and easy to implement, and provides a good solution for applications requiring high optical link dynamic range.