A new method of reducing coherent Rayleigh noise (CRN) by using Phase Shift Keying (PSK) pulse coding is characterized and demonstrated theoretically and experimentally. A phase modulator driven by an arbitrary function generator is employed to encode pulses with PSK modulation, the traces obtained by coded pulses with different coding orders are superposed and averaged to reduce CRN. The experimental results validate that our method can realize about 0.49 dB amplitude fluctuation in 10 km optical fiber with 10 m spatial resolution when the coding length is 6bit. Compared with the method of FSAV, the method presented in this paper has almost the same CRN reduction effect at different spatial resolutions. From a practical point of view, the proposed method may be attractive in reducing the CRN for the Rayleigh scattering distributed optical fiber sensing system especially when the high spatial resolution and high accuracy are the main concerns.

通过相移键控（PSK）脉冲编码来降低相干瑞利噪声（CRN）的新方法的特点在理论上和实验上得到了证明和证明。使用由任意函数发生器驱动的相位调制器对具有PSK调制的脉冲进行编码，将具有不同编码阶数的编码脉冲所获得的迹线叠加并求平均，以降低CRN。实验结果证明，当编码长度为6bit时，在10 km的空间分辨率为10 m的光纤中，我们的方法可以实现约0.49 dB的幅度波动。与FSAV方法相比，本文提出的方法在不同的空间分辨率下具有几乎相同的CRN减少效果。从实际的角度来看，