光纤复合低压电缆温度特性及传输损耗分析

Analysis of temperature characteristics and transmission loss of optical fiber composite low-voltage cable

光纤复合低压电缆(OPLC)的温度特性及传输损耗特性对决定光网络传输距离、传输稳定性和可靠性非常重要。针对电流热效应、不同材料膨胀系数造成的光纤应力差以及微弯对光纤传输损耗的影响,建立了基于光纤模式理论的电流与光纤传输损耗的数学模型。同时,为了更符合OPLC运行的实际情况,设计了排管敷设的OPLC仿真模型。采用COMSOL对所提出的OPLC温度特性与传输损耗模型进行仿真,结果表明:光纤温度随电缆导体电流的增大呈非线性增加趋势,导体电流对光纤传输损耗的影响在工程允许范围之内。

The temperature characteristics and transmission loss characteristics of optical composite low voltage cable（OPLC） are very important to determine optical network transmission distance, transmission stability and reliability. Aiming at the effects of current thermal effect, fiber stress difference caused by different material expansion coefficients and microbend on fiber transmission loss, a mathematical model of current and fiber transmission loss based on fiber mode theory was established. At the same time, in order to better meet the actual situation of OPLC operation, the OPLC cable simulation model of pipe laying was designed. The proposed OPLC temperature characteristics and transmission loss model are simulated by COMSOL. The results show that the fiber temperature increases with the cable conductor current. In a nonlinear increase trend,the influence of conductor current on the transmission loss of the fiber is within the engineering allowable range.