النمذجة العددية للنقل الاشعاعي في الالياف البصرية الدقيقة

In this paper we will presenting some preliminary analysis on some of the different aspects involved in modeling the Thermal Processing in Photonic Crystal Fiber (PCF). Initially we present the different scaling laws for the fiber and analyze the different regimes of heat transfer to identify the regions where irradiative transport is important. Next we present the Monte-Carlo ray tracing method to determine the overal I absorption in an eccentric annulus. Finally we present the resultsfqr the overall absorption in a structure with multiple holes. Results indicate for black boundaries it was found that the absorptance depended only on the ratio of inner to outer radius R, I R,, and absorption coefficient K and independent of the offset. For Fresnel boundaries it was found that for small optical thicknesses there was a linear increase in the absorptance with offset (for the same radius ratio). The absorptance was almost independent of the offset when KR,, (optical thickness) is greater than unity. Therefore, an eccentric annulus can be treated as aconcentric annulus provided KR,, is greater than unity for determining the overall absorption