Bjerkan L, Nordby H
Appl Opt. 1981 Feb 1;20(3):435-9. doi: 10.1364/AO.20.000435.
A method for calculating the pulse distortion in a spliced multimode optical fiber vs transverse misalignment is presented. Measurements on two graded-index and one step-index fibers are shown. In graded-index fibers both theory and experiment show a rapid decrease of the rms pulse width for large offsets. For smaller offsets some discrepancies are observed. These are remedied to some extent by considering unequal mode excitation conditions. Different lengths of the two spliced sections are investigated as well. In the step-index case the experiments show no variation in the rms pulse width as predicted by the theory.
提出了一种计算拼接多模光纤中脉冲失真与横向失准关系的方法。给出了对两根渐变折射率光纤和一根阶跃折射率光纤的测量结果。在渐变折射率光纤中，理论和实验均表明，对于大偏移量，均方根脉冲宽度会迅速减小。对于较小的偏移量，则观察到一些差异。通过考虑不等模激励条件，这些差异在一定程度上得到了弥补。还研究了两个拼接段的不同长度。在阶跃折射率光纤的情况下，实验表明均方根脉冲宽度没有如理论预测的那样发生变化。
