基于单向传输的光纤时延波动测量

Fiber time delay fluctuations measurement based on one-way transfer

为了与现有光纤通信网络兼容,研究了一种基于单纤单向传输的光纤时延波动测量方法。基于色散温变效应和Sellmeier等式,建立了利用温度的准确测量和双波长光信号传输时延差波动反推单向时延波动的比例模型。令模型中的比例系数是单波长时延波动和双波长时延差波动的比,仿真研究了温度和波长差对比例系数的影响。搭建了75 km光纤单向时延波动测量实验平台,实验结果表明:实测比例系数-258.4接近于理论比例系数-277.3,对应单向传输时延波动误差为660 ps,实验结果验证了模型的正确性和基于单向传输的光纤时延波动测量的可能性。

In order to be compatible with the existing optical communication network,a time delay fluctuations measurement based on"single-fiber one-way"transfer scheme was proposed.Based on the temperature-induced variation of group velocity dispersion effect and Sellmeier equation,a proportionality model for calculating the one-way delay fluctuations was established with detecting the delay difference fluctuations between two propagating optical signals at given different wavelengths and accurate temperature measurement.Assuming proportionality coefficient in the model was the ratio between one-way delay fluctuations and one-way dual wavelength delay difference fluctuations.By simulation,the impact of fiber link parameters,such as temperature and wavelength difference,on proportionality coefficient was discussed.The experimental platform for one-way time transfer over 75 km fiber was conducted and the experimental results show that the measured proportional coefficient is-258.4,close to the theoretical proportional coefficient-277.3,and the corresponding one-way delay variation error is 660 ps.The measured results validate the correctness of the proposed model as well as the possibility of fiber time delay fluctuations measurement based on one-way transfer.