提出了一种光纤色散的简单快速测量方法。该方法采用光纤激光器结构,由Sagnac环和光纤耦合器组成的光纤环形镜作为谐振腔一端的反射腔镜,另一端反射腔镜为不同中心波长的光纤光栅。利用光开关依次构成n个独立的光纤激光器。通过对激光拍频的测量得到在不同波长下待测光纤的时延,进一步可以得到待测光纤的色散系数。利用该方法实现了对一根长度为500 m的色散补偿光纤的色散测量。结果表明,该方法切实可行、操作简单,能够实现光纤色散的快速测量,从而为通信系统中光纤的类型、长度等参数的合理选用提供参考。

A simple and fast dispersion measurement method is proposed based on the fiber laser structure. The resonant cavity is composed of two mirrors, one composed of Sagnac ring and fiber coupler and the other composed of the fiber gratings with different central wavelengths. The fiber lasers are established with different independent wavelengths based on optical switch. Gauging the laser beat frequency, we can obtain the time delay of the optical fiber under different wavelengths and then can obtain the dispersion coefficient. The dispersion of a 500-m-long dispersion compensation fiber is tested by the proposed method. The results show that the method is feasible, easy to implement, and can realize the rapid measurement of the optical fiber dispersion. The method can provide a reference for the selection of fiber parameters such as the fiber type and length in the communication applications.