Cohen L G
Appl Opt. 1975 Jun 1;14(6):1351-6. doi: 10.1364/AO.14.001351.
Partially transparent mirrors were pressed against fiber ends so that the length dependence of pulse spreading could be determined without cutting the fiber into pieces. Measurements were made by comparing the widths of laser pulses (lambda = 0.9 microm) through the output end mirror, which returned from 9(1/2) successive round trips (2014-m extrapolated length) along a 106-m multimode fiber. Mode mixing was significant in this fiber (fabricated by Corning Glass Works), and a square root of length pulse width dependence was observed. However, some of the mode-mixing effects on pulse width were caused by the way in which the fiber was wound on a drum.
将部分透明镜压在光纤末端，这样就可以在不把光纤切成小段的情况下确定脉冲展宽的长度依赖性。通过比较经过输出端镜返回的激光脉冲（波长λ = 0.9微米）的宽度进行测量，这些脉冲沿着一根106米长的多模光纤进行了9.5次连续往返（外推长度为2014米）。在这种光纤（由康宁玻璃厂制造）中模式混合很显著，并且观察到脉冲宽度与长度的平方根依赖性。然而，一些对脉冲宽度的模式混合效应是由光纤缠绕在鼓上的方式引起的。
