Limitation on Effective Area of Bent Large-Mode-Area Leakage Channel Fibers

Author

Saitoh, Kunimasa ; Varshney, Shailendra ; Sasaki, Kaori ; Rosa, Lorenzo ; Pal, Mrinmay ; Paul, Mukul Chandra ; Ghosh, Debashri ; Bhadra, Shyamal Kumar ; Koshiba, Masanori

Author_Institution

Grad. Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo, Japan

Volume

29

Issue

17

fYear

2011

Firstpage

2609

Lastpage

2615

Abstract

We investigate the bending characteristics of leakage channel fibers (LCFs) to achieve large mode area (LMA) and effectively single-mode operation with a practically allowable bending radius for compact Yb-doped fiber applications. Through numerical simulations, carried by the full-vectorial finite-element method, we present the limitations on the effective area of LCFs under bent condition and compare their limits with that of conventional step-index LMA fibers. Due to a better controllability of the low numerical aperture and a large value of the differential bending loss (~20 dB/m) between the fundamental and higher order modes in LCFs, the LMA of ~500 μm² (core diameter of ~36 μm) at 1064 nm can be achieved when the optimized LCF is bent into a 10 cm bending radius.

Keywords

finite element analysis; optical fibres; bent large-mode-area leakage channel fibers; full-vectorial finite-element method; large mode area; numerical simulations; size 36 mum; step-index LMA fibers; wavelength 1064 nm; Frequency modulation; Indexes; Optical fiber amplifiers; Refractive index; Silicon compounds; Solids; Effectively single mode (ESM); fiber lasers; large-mode-area (LMA) fibers; leakage channel fibers (LCFs); microstructured optical fibers (MOFs);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2011.2161603

Filename

5951712