Wang Lingke, Huang Junchao, Liu Liang, Li Tang
Opt Express. 2017 May 29;25(11):12161-12170. doi: 10.1364/OE.25.012161.
We report a 32-times multiplication of optical pulse rate based on a cascaded optical fiber ring interferometer for generating ultra-low noise photonic microwaves. The optical power loss of the interleaver is approximately 0.5 dB, which is the lowest insertion loss for optical pulse interleaving to date. The time delay in each interleaver stage is precisely controlled by measuring the power ratio between the harmonics of the generated microwaves. In addition, the relationship between the phase noise reduction from the continuous-wave shot noise limit and interleaver delay errors is verified experimentally for the first time. Finally, a phase noise level of -173 dBc/Hz for a single multiplication channel at an offset frequency of 2 MHz was measured.
我们报道了一种基于级联光纤环形干涉仪的光脉冲速率32倍倍增方法，用于产生超低噪声光子微波。该交织器的光功率损耗约为0.5 dB，这是迄今为止光脉冲交织的最低插入损耗。通过测量所产生微波谐波之间的功率比，精确控制每个交织器阶段的时间延迟。此外，首次通过实验验证了从连续波散粒噪声极限降低的相位噪声与交织器延迟误差之间的关系。最后，在2 MHz的偏移频率下，测量了单个倍增通道的相位噪声水平为-173 dBc/Hz。
