Stone F T
Appl Opt. 1978 Sep 1;17(17):2825-30. doi: 10.1364/AO.17.002825.
In this paper we describe the effect of different launching conditions on the loss measured with a calorimeter in short (~1-m) lengths of multimode optical fiber. A qualitative description of the relation between the energy distribution in the fiber and various excitation variables is given, and many examples are presented that illustrate the effect that launch conditions have on the fiber loss. The use of launch-dependent loss phenomena to diagnose loss mechanisms in optical fibers is discussed. In particular, loss plots are shown for two germania-doped silica-core fibers that indicate a strong absorption loss mechanism located deep within the fiber core.
在本文中，我们描述了不同发射条件对用热量计在短（约1米）长度的多模光纤中测量的损耗的影响。给出了光纤中能量分布与各种激发变量之间关系的定性描述，并给出了许多示例来说明发射条件对光纤损耗的影响。讨论了利用与发射相关的损耗现象来诊断光纤中的损耗机制。特别是，给出了两种掺锗石英芯光纤的损耗图，这些图表明在光纤芯深处存在一种强烈的吸收损耗机制。
