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Temperature influence on the mode distribution in SM fiber nearby the cutoff normalized frequency

机译：温度对截止归一化频率附近的SM光纤中模式分布的影响

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摘要

The optical fiber cutoff frequency is by one of its critical parameters, which couple working wavelength of lights, optical fiber dimension and refractive indexes of core and cladding into one numerical parameter. If the operational wavelength of the light source will be shorter than the cut-off wavelength is, then the fiber will support except fundamental mode the propagation of several higher modes too. Such fibers conserve themselves the advantageous characteristics for telecommunication application (small attenuation, slight dispersion), but it is possible to use them for sensor-based applications utilizing the mode coupling among guided modes. For the external influences plotting (e.g. temperature) causing on telecommunication fiber along the transmission route then the attenuation shift is not applicable because it impends the transmission in its principle either by an BER increase with keeping the transmission rate constant or by transmission rate fall with constant BER conservation. None of these implications is acceptable in optical backbones. Once from among few possibilities how to solve this problem is to set the operating conditions of the SM fiber nearby cutoff normalized frequency. In the paper the basic theory together with the simulation of the mode distribution will be shown for particular types of optical fibers for temperature changes within the interval 0℃-80℃
机译：光纤截止频率是其关键参数之一，它将光的工作波长，光纤尺寸以及纤芯和包层的折射率耦合为一个数值参数。如果光源的工作波长比截止波长短，那么除了基本模式之外，光纤还将支持几种更高模式的传播。这样的光纤保留了它们在电信应用中的有利特性（衰减小，色散小），但是可以利用它们在导引模式之间的模式耦合在基于传感器的应用中使用。对于沿传输路径在电信光纤上造成的外部影响图（例如温度），则衰减偏移不适用，因为它在原理上通过BER保持恒定的传输速率来阻止传输或保持恒定的传输速率来阻止传输BER节约。这些含义在光骨干网中都不可接受。从几种可能性中解决该问题的方法之一就是将SM光纤的工作条件设置在截止标准化频率附近。本文将介绍特定类型的光纤在0℃-80℃区间内温度变化的基本理论以及模式分布的仿真。

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