激光器的相对强度噪声(RIN)在微波光子链路中转换为噪声功率, 进而影响链路的动态范围。文章建立了基本结构的非相干和相干微波光子链路的动态范围(SFDR)模型, 并通过仿真对比分析了激光器的RIN对这两种链路结构的影响。在光器件的性能水平较低时, 非相干微波光子链路能获得更大的SFDR; 随着光器件性能水平的提升, 相干微波光子链路的SFDR将超过非相干微波光子链路。而在目前典型的器件参数条件下, 两种链路的理论SFDR都能达到120dB·Hz2/3左右。

The relative intensity noise (RIN) of lasers will change to noise power in microwave photonic links, which limits the dynamic range. Theoretical models of spurious free dynamic range (SFDR) in basic configurations of non-coherent and coherent microwave photonic links were established, and the impact of RIN on the two kinds of links was analyzed and comparedby simulation.When the performance of optical devices was low, non-coherent microwave photonic link would exhibit lager SFDR; as the performance of optical devices increases, the SFDR of coherent microwave photonic link would exceed that of non-coherent microwave photonic link. Moreover, under the conditions of typical optical devices nowadays, the theoretical SFDR of both two kinds of links can reach 120dB·Hz2/3.