在全光网络中光码流的性能监控、强场物理中单次激光脉冲性能评估、干涉测速以及其他许多物理过程中都需要对瞬态光信号进行实时测量。提出了一种结合宽光谱抽运四波混频光-光采样和时间拉伸的瞬态光信号实时测量技术，拟利用特种光纤的超快非线性效应对光信号进行超分辨率采样，同时将单波长信号转换为宽光谱信号，进而利用光纤色散傅里叶变换对信号进行时间拉伸，可大为降低初始光信号带宽。对宽光谱四波混频和时间拉伸过程进行了理论分析，表明该方案是完全可行的。

Real-time measurement of the transient optical signal provides invaluable information about the dynamic processes, such as optical data stream monitoring in all-optical network, velocity interferometry and performance evaluation of single optical pulse in physics of intense fields. An all optical system based on wide spectral pump four wave mixing optical-optical sampling and time stretch is reported to measure the transient optical signal in real time. The proposed technique samples the optical signal with super-resolution, converts the single wavelength signal to wide spectral signal and stretches it using dispersive Fourier transformation. The process of four wave mixing and time stretch in theory are analyzed and its feasibility is verified.