Jeunhomme L, Pocholle J P
Appl Opt. 1978 Feb 1;17(3):463-8. doi: 10.1364/AO.17.000463.
A method is described permitting excitation of a small number of modes in graded index fibers, the order of the launched mode being easily varied and determined. Using this launching technique, it is possible to determine the index profile and index difference of graded core fibers; results are compared with those obtained by other techniques. Other important fiber parameters, such as the differential attenuation and the differential propagation delay time as a function of the mode parameter, are also obtained, giving an insight into the fundamental propagation characteristics of the fiber.
本文描述了一种在渐变折射率光纤中激发少量模式的方法，所发射模式的阶数易于改变和确定。利用这种发射技术，可以确定渐变芯光纤的折射率分布和折射率差；并将结果与通过其他技术获得的结果进行比较。还获得了其他重要的光纤参数，例如作为模式参数函数的微分衰减和微分传播延迟时间，从而深入了解光纤的基本传播特性。
