为了适应激光工程系统中光纤激光器和光纤器件的应用，设计研制了一种基于光纤器件超短脉冲测量的自相关仪。系统中利用了11偏振无关光纤分束器、光纤准直器、光纤偏振控制器、不同分束比的光纤耦合器和光纤隔离器等光纤元器件，以及光纤接口光谱仪。重点分析了光纤干涉仪中的光纤偏振效应、倍频器件的偏振要求和光纤准直器耦合效率等因素对自相关测量的影响，并给出了相应的解决方法。实验中对一个非线性偏振旋转光纤锁模激光器的输出脉冲宽度进行了测量，证实了光纤自相关仪的可行性。研究表明光纤自相关仪具有与光纤激光系统连接方便、结构简单、轻巧等诸多优点。

In order to adapt fiber lasers and fiber devices to the application of laser engineering system, an auto-correlator based on the fiber devices is designed. The 11 fiber polarization independent beam splitter, fiber collimator, fiber polarization controller, fiber coupler with different ratios, fiber isolator, and fiber interface spectrometer are used in the system. The influence of fiber polarization effect, polarization requirement of frequency-double crystal, coupling efficiency of fiber collimator on the autocorrelation measurement are analyzed and the corresponding methods of overcoming those defects are introduced. Experimentally the output pulse width of nonlinear polarization rotation mode-locked fiber laser is measured and the auto-correlator is feasible. It is indicated that the fiber auto-correlator has the characteristics of convenient connection with fiber laser systems, simple and light structure and so on.