Analysis of two parallel long-period fiber gratings

Author

Chiang, Kin Seng ; Chan, Florence Yuen Ming ; Ng, Mei Nar

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, China

Volume

22

Issue

5

fYear

2004

fDate

5/1/2004 12:00:00 AM

Firstpage

1358

Lastpage

1366

Abstract

A wavelength-selective coupler constructed with two parallel identical uniform long-period fiber gratings (LPFGs) is analyzed by the coupled-mode theory. The effects of introducing a longitudinal offset distance between the two gratings on the transmission characteristics of the coupler are discussed and the conditions for achieving a 100% coupling efficiency are highlighted. It is found that 100% coupling can be achieved with a practical grating length by using a proper grating design and a suitable index-matching surrounding medium. The theoretical results agree well with the experimental data.

Keywords

coupled mode analysis; diffraction gratings; optical design techniques; optical fibre couplers; 100 percent; 100% coupling efficiency; coupled-mode theory; grating design; grating length; index matching; longitudinal offset distance; parallel long-period fiber gratings; transmission characteristics; wavelength-selective coupler; Bragg gratings; Fiber gratings; Optical coupling; Optical fiber couplers; Optical fiber theory; Optical filters; Refractive index; Resonance; Strain measurement; Temperature sensors; Coupled-mode theory; LPFGs; fiber gratings; long-period fiber gratings; optical couplers; optical filters;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2004.825357

Filename

1298864