Asymmetrically Corrugated Long-Period Gratings by Burning Fiber Coating and Etching Cladding

Author

Zhiquan Cui ; Weigang Zhang ; Fang Liu ; Hao Zhang ; Zhiyong Bai ; Pengcheng Geng ; Shecheng Gao

Author_Institution

Key Lab. of Opt. Inf. Sci. & Technol., Nankai Univ., Tianjin, China

Volume

25

Issue

20

fYear

2013

fDate

Oct.15, 2013

Firstpage

1961

Lastpage

1964

Abstract

A novel method to form asymmetrically corrugated long period fiber gratings (LPFGs) by periodically scanning the unstripped optical fiber using the high-frequency CO₂ laser under side illumination as well as HF etching processing has been proposed and demonstrated in this letter. Microbends exist in the asymmetric structures when tensile force is applied that greatly enhance the refractive index modulation. Several asymmetrically corrugated LPFGs with a grating pitch of 600 μm are fabricated. A linearly step-changed period chirped corrugated LPFG has also been fabricated that well proves the flexibility of this method in fabricating nonuniform corrugated LPFGs.

Keywords

carbon compounds; diffraction gratings; etching; optical fibre cladding; optical fibre fabrication; optical modulation; refractive index; solid lasers; CO₂; HF etching; asymmetric structures; asymmetrically corrugated LPFG; asymmetrically corrugated long period fiber gratings; etching cladding; fiber coating; grating pitch; high-frequency CO₂ laser; linearly step-changed period chirped corrugated LPFG; microbends; nonuniform corrugated LPFG; refractive index modulation; side illumination; size 600 mum; tensile force; unstripped optical fiber; Chirp; Coatings; Fiber gratings; Fiber lasers; Force; Optical fiber sensors; Optical fibers; ${rm CO}_{2}$ laser; asymmetric; corrugated long-period fiber grating; etching; loss tunable;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2275007

Filename

6570533