利用长周期光栅实现光子晶体光纤中的纤芯-包层模式耦合与再耦合，以增强倏逝场的重叠。

Core-cladding mode coupling and recoupling in photonic crystal fiber for enhanced overlap of evanescent field using long-period gratings.

作者信息

He Zonghu, Zhu Yinian, Kanka Jirí, Du Henry

机构信息

Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.

出版信息

Opt Express. 2010 Jan 18;18(2):507-12. doi: 10.1364/OE.18.000507.

DOI:10.1364/OE.18.000507

PMID:20173870

Abstract

Excitation of cladding modes has been achieved using long-period (LPGs) inscribed in an endlessly single-mode photonic crystal fiber (ESM PCF) by CO(2) laser irradiation. Core-cladding mode coupling and recoupling has resulted in marked improvement in the evanescent field overlap throughout the cladding air channels in the PCF-LPG, compared to the PCF alone. Our numerical simulation has shown that design optimization of the PCF-LPG configuration can lead to a field power overlap as high as 22% with a confinement loss of less than 1 dB/m in the cladding mode.

摘要

通过二氧化碳激光辐照，在无限单模光子晶体光纤（ESM PCF）中写入长周期光栅（LPG），实现了包层模的激发。与单独的光子晶体光纤相比，纤芯-包层模耦合和再耦合显著改善了光子晶体光纤-长周期光栅中包层空气通道内的倏逝场重叠。我们的数值模拟表明，光子晶体光纤-长周期光栅结构的设计优化可使包层模中的场功率重叠高达22%，限制损耗小于1 dB/m。