提出了一种基于宽带随机信号测量多模光纤差分模延迟的方法。该方法将放大自发辐射(ASE)光信号分成两路，分别作为参考光与探测光，参考光与经过多模光纤传输后的探测光进行互相关，根据相关曲线峰值的位置可成功测量多模光纤差分模延迟。实验测量了不同长度多模光纤的差分模延迟，并分析了测量信噪比。结果表明，该方法在限模注入下测得待测光纤的差分模延迟系数为0.61 ps/m，具有较高的测量信噪比，当相关曲线峰值旁瓣水平为3.16 dB时，信号强度仅为噪声强度的5.3%。

An approach to measure differential mode delay of multimode fibers based on broadband random signal is proposed. An amplified spontaneous emission (ASE) signal is divided into two beams, with one serving as the probe light and the other as the reference light. By correlating the reference light and the probe light transmitted through the multimode fiber, the differential mode delay is obtained by the correlation peaks. Differential mode delay for multimode fibers with different lengths is experimentally measured, and the signal-to-noise ratio of measurement is analyzed. Results show that the differential mode delay coefficient is 0.61 ps/m for the restricted mode launch condition. When the peak sidelobe level is 3.16 dB, the probe signal intensity is only 5.3% of the noise intensity.