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ESI determination from Petermann mode-field diameter measurements and refractive index profile measurements on single-mode fibres

机译：通过petermann模场直径测量和单模光纤上的折射率分布测量来确定EsI

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The two main approaches to the characterization of single-mode fibres: viz. Equivalent Step Index (ESI) and Mode Field Diameter (MFD) are still causing confusion and no real standard procedure has won the confidence of laboratory users. In a previous paper we have shown that in principle, a self For consistent method can unify both the ESI and MFD approaches. instance, it has been shown that the two parameter of the ESI approximation as derived from the moment theory of single-mode optical fibres can be determined independently from either measurement of the Petermann MFD or from measurements of the refractive index profile. This duality feature makes the moments description of single-mode fibres unique amongst a whole range of experimental and theoretical characterization methods. In this paper we implement and critically assess our new approach using three independent measurement procedures. The ESI parameters as obtained from (i) MFD measurements, (ii) preform profile measurements and (iii) fibre profile measurements are compared for a nominally step index fibre fabricated by the MCVD process. A statistical approach is adopted in analysing the measurement data, thereby reducing the influence of measurement error and other inherent uncertainties. Results show that while the preform and the fibre profile measurements produce essentially the same equivalent core radius and the same equivalent numerical aperture (with allowance for diffusion effects) the ESI parameters produced by the MFD are substantially different. The discrepancy arises from the use of the "effective" cut-off wavelength, as derived from the MFD measurements, instead of the "theoretical" cut-off wavelength (corresponding to a V-value of 2.405) in the evaluation of the ESI parameters. However, it is found that if the cut-off wavelength as derived from the profile measurements, is used in the interpretation of the MFD data then, the three measurement approaches predict very similar ESI parameters. While only one fibre-preform is reported here, one other nominally step-index fibre-preform exhibited similar trends
机译：表征单模光纤的两种主要方法：即。等效步长指数（ESI）和模场直径（MFD）仍在引起混乱，还没有真正的标准程序赢得实验室用户的信任。在先前的论文中，我们表明，原则上，自我一致方法可以统一ESI和MFD方法。例如，已经表明，可以从Petermann MFD的测量值或折射率分布的测量值中独立确定从单模光纤的矩理论中得出的ESI近似值的两个参数。这种双重特性使单模光纤的瞬间描述在整个实验和理论表征方法中独树一帜。在本文中，我们使用三个独立的测量程序来实施并严格评估我们的新方法。比较通过（i）MFD测量，（ii）瓶坯轮廓测量和（iii）纤维轮廓测量获得的ESI参数，以比较通过MCVD工艺制造的标称阶跃折射率纤维。在分析测量数据时采用统计方法，从而减少了测量误差和其他固有不确定性的影响。结果表明，尽管预成型件和纤维轮廓测量结果产生了基本相同的等效纤芯半径和相同的等效数值孔径（考虑到扩散效应），但MFD产生的ESI参数却大不相同。差异是由于使用MFD测量得出的“有效”截止波长而不是ESI参数评估中的“理论”截止波长（对应于2.405的V值）引起的。但是，发现如果从轮廓测量得出的截止波长用于MFD数据的解释，则这三种测量方法可预测非常相似的ESI参数。尽管此处仅报告了一种纤维预成型坯，但另一种名义上的阶跃折射率纤维预成型坯却表现出相似的趋势

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    Martinez F.; Hussey C.D.;

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  • 年度 1987
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