Analytical Expressions for Power Coupling Coefficients Into Graded-Index Fibers With Generalized Beam Launch Conditions

被引：1

作者：

Li, Shanglin ^{[1
]}

Nezami, Mohammadreza Sanadgol ^{[1
,2
]}

Liboiron-Ladouceur, Odile ^{[1
]}

机构：

[1] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 0E9, Canada

[2] Univ British Columbia, Dept Elect & Comp Engn, Columbia, BC V6T 1Z4, Canada

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2021年 / 39卷 / 22期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Laser beams; Couplings; Refractive index; Indexes; Optical variables control; Optical refraction; Optical beams; Laguerre-Gaussian beam; graded-index fiber; power coupling coefficient; launch condition; MODE EXCITATION;

D O I：

10.1109/JLT.2021.3110505

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, we derive the closed-form analytical expressions of the power coupling coefficients for a Laguerre-Gaussian beam coupled into a graded-index fiber with either central, offset, or tilted launch. We further generalize to an arbitrary launching condition with the radial offset and the three-dimension angular tilt simultaneously occurring. The analytical results are in good agreement with the numerical ones and can be applied to manufactured graded-index multimode fibers with an index exponent parameter from 1.8 to 2.2. Using the derived analytical expressions, the computation time shortens by at least a four-order of magnitude compared to conventional numerical methods.

引用

页码：7259 / 7273

页数：15

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