Bending losses of trench-assisted few-mode optical fibers

被引：22

作者：

Zheng, Xingjuan ^{[1
,2
]}

Ren, Guobin ^{[1
,2
]}

Huang, Lin ^{[1
,2
]}

Li, Haisu ^{[1
,2
]}

Zhu, Bofeng ^{[1
,2
]}

Zheng, Heling ^{[3
]}

Cao, Min ^{[1
,2
]}

机构：

[1] Beijing Jiaotong Univ, Key Lab All Opt Network & Adv Telecommun Network, Beijing 100044, Peoples R China

[2] Beijing Jiaotong Univ, Inst Lightwave Technol, Beijing 100044, Peoples R China

[3] State Grid Linyi Power Supply Co, Jinan 276000, Shandong, Peoples R China

来源：

APPLIED OPTICS | 2016年 / 55卷 / 10期

基金：

中国国家自然科学基金;

关键词：

DESIGN; COMMUNICATION; TRANSMISSION; NETWORKS; FORMULA; LIMITS; DELAY; FIELD; AREA;

D O I：

10.1364/AO.55.002639

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A semianalytical method based on the perturbation theory is developed to calculate the bending losses of individual modes of few-mode fibers (FMFs); it is applicable for optical fibers with arbitrary circularly symmetric index profile, especially for trench-assisted fibers. The bending performance of trench-assisted step-index FMFs and parabolic-index FMFs are investigated with three key parameters (i.e., the refractive index difference of trench-cladding, the width of the trench, and the distance of the core-trench). Then, a performance index is defined to estimate the bending performance for FMFs. It is shown that changing the distance of the trench-core, for each order of mode, there is a minimum bending loss, which can be used for fiber optimization. This optimization position (core-trench distance) decreases as the mode order increases. It is found that the bending performance of parabolic-index FMFs is better than that of step-index FMFs with fixed core radius and cutoff wavelength. The conclusions are helpful for understanding the mechanism of bending loss for FMFs, and make contributions to designing and manufacturing of few-mode bend-insensitive fibers. (C) 2016 Optical Society of America

引用

页码：2639 / 2648

页数：10

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