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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·Hz~(2/3)左右。
The relative intensity noise (RIN) of the laser is converted to noise power in the microwave photonic link, which in turn affects the dynamic range of the link. In this paper, the basic structure of the incoherent and coherent microwave photonic chain dynamic range (SFDR) model is established, and the influence of the RIN of the laser on the two link structures is analyzed by simulation. The non-coherent microwave photonic chain achieves greater SFDR at lower performance levels of the optical device, and the SFDR of the coherent microwave photonic chain over the non-coherent microwave photonic chain as the performance level of the optical device increases. Under the current typical device parameters, the theoretical SFDR of the two types of links can reach about 120dB · Hz ~ (2/3).