光纤主模测量的最佳发射状态
Optimal launch states for the measurement of principal modes in optical fibers
摘要：
多模光纤的模式色散特性可以使用最近提出的模式相关的信号延迟的方法进行。该方法包括通过多模光纤使用不同的模式组合发送光脉冲，并测量光纤输出处的模式群延迟。从这些测量，它是可能的，以估计模式色散矢量，主模式，和它们相应的差分模式群延迟。在本文中，我们修改和扩展的模式相关的信号延迟方法的理论框架，包括接收机噪声和模式相关的损失的影响。我们计算最佳的发射模式，最大限度地减少光纤模式色散矢量的估计中的噪声误差。我们表明，对于一个40模式的光纤，电子信号噪声比（SNR）的渐近改善了近6 dB相比，传统的模式组合。
英文摘要：
Modal dispersion characterization of multimode optical fibers can be performed using the recently-proposed mode-dependent signal delay method. This method consists of sending optical pulses using different combinations of modes though the multimode optical fiber and measuring the mode group delay at the fiber output. From these measurements, it is possible to estimate the modal dispersion vector, the principal modes, and their corresponding differential mode group delays. In this paper, we revise and extend the theoretical framework of the mode-dependent signal delay method to include the impact of receiver noise and mode-dependent loss. We compute optimal launch modes, minimizing the noise error in the estimation of the fiber modal dispersion vector. We show that, for a 40-mode fiber, the electronic signal-to-noise ratio (SNR) is improved asymptotically by almost 6 dB compared to conventional mode combinations.
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