By employing the Langevin equation, we have examined a mode coupling in graded index plastic optical fiber. The numerical integration of the Langevin equation is based on the computer-simulated Langevin force. The solution matches the experimental data reported previously. We have shown that by solving the Langevin equation (stochastic differential equation) one can treat a mode coupling in graded index plastic optical fibers, which is result of fiber's intrinsic random perturbations.

中文翻译：

---

使用朗之万方程研究渐变折射率塑料光纤中的模式耦合

通过使用朗之万方程，我们研究了渐变折射率塑料光纤中的模式耦合。Langevin 方程的数值积分基于计算机模拟的 Langevin 力。该解决方案与之前报告的实验数据相匹配。我们已经表明，通过求解朗之万方程（随机微分方程），可以处理渐变折射率塑料光纤中的模式耦合，这是光纤固有随机扰动的结果。