We developed a low-coherence interference measurement system using the time-stretch dispersive Fourier transformation technique and demonstrated 10 MHz measurements of the interference signal. We estimated the path length distribution by performing Fourier transformation of the interference signal. The estimated path length difference agreed with the set value. However, as the path length increased, the peak value and width of the path length distribution decreased and broadened, respectively. This behavior was due to the nonlinearity of the chirp rate. We proposed a simple method for calibrating and compensating for the nonlinearity of the chirp rate by analyzing the phase of interferograms for multiple path length. The decrease in peak value and widening of the path length distribution were improved by the proposed compensation method.

中文翻译：

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具有10 MHz重复频率和非线性色散补偿的低相干干涉仪

我们使用时延色散傅立叶变换技术开发了一种低相干干扰测量系统，并演示了对干扰信号的10 MHz测量。我们通过对干扰信号进行傅立叶变换来估计路径长度分布。估计的路径长度差与设定值一致。但是，随着路径长度的增加，路径长度分布的峰值和宽度分别减小和变宽。此行为是由于线性调频率的非线性造成的。通过分析多路径长度干涉图的相位，我们提出了一种简单的方法来校准和补偿线性调频脉冲的非线性。提出的补偿方法改善了峰值的减小和路径长度分布的加宽。