给出了平衡式光学互相关方案的理论数学计算和各相关参数对测量性能的影响。研究了该测量方案的工作原理,并给出相应的数学计算,分析了脉冲宽度,倍频晶体长度以及两垂直脉冲光在晶体中的群速度对测量动态范围和灵敏度的影响。在理论分析的基础上,搭建了个平衡式互相关器的实验平台,测量光脉冲经过100 m光纤链路传输后产生的时间抖动。实验结果表明,定标曲线与理论计算吻合,在有光纤振动的情况下,1-100 Hz频率范围内的传输抖动均方根值约为20 fs。

Mathematical computation for a scheme of balanced optical cross correlation and analysis for the effect of the related parameters on the measuring performance are given. The measuring principle is studied in detail and the mathematical computation is given. We analyze the effect of the pulse width,the crystal length and the group velocity difference between the two perpendicular polarized pulses on dynamic range and sensitivity. On the basis of the theoretical analysis,we construct the experimental platform of the balanced optical cross correlator for the first time to measure the timing jitter of the pulses after transmission through a fiber link of 100 m. The experimental calibration curve agrees with our theoretical computation and the rms of the timing jitter is about 20 fs in the frequency range of 1-100 Hz with the existence of the fiber vibration.