热光耦合作用下的光纤传输特性

通过求解电磁波束包络方程和能量方程的耦合方程组,考虑温度对材料介电系数的影响及传输损耗产热的耦合作用,求解了复合热边界条件下光纤的基模态传输和损耗问题。研究表明:随着纤芯半径的增大,电场强度、能量耗散密度减小,传播常数增大;环境温度降低、对流换热系数增大和表面发射率升高都会使得传播常数减小,电场强度、能量耗散密度增大;能量耗散密度和电场强度随截面曲率的变化并不是线性的,还受到其他因素的共同作用。

Transmission Charactertistics of Optical Fiber Under Coupled Thermal-optical Effects

The optical fiber''s base-mode transmission and energy loss under integrated thermal boundary conditions were analyzed by using a coupling equation set composed of an electromagnetic beam envelope equation and an energy equation. The impact of the temperature on the material''s dielectric coefficient as well as the heat generation induced by energy loss during transmission were taken into account. As the fiber core''s radius increases, the electric-field intensity and power dissipation density decrease and the propagation constant increases. Lower ambient temperature, higher convective heat transfer coefficient, and higher surface emissivity can lead to lower propagation constant, higher electric-field intensity, and higher power dissipation density. The changes in power dissipation density and electric-field intensity with the cross-section curvature are not linear and also influenced by other factors.