Near-constant time delay response of fiber grating Sagnac loop filters

Author

Shu, Xuewen ; Zhao, Donghui ; Zhang, Lin ; Sugden, Kate ; Bennion, Ian

Author_Institution

Photonics Res. Group, Aston Univ., Birmingham, UK

Volume

14

Issue

8

fYear

2002

Firstpage

1127

Lastpage

1129

Abstract

A theoretical and experimental investigation of the time delay characteristics of fiber Bragg grating-based Sagnac loops (FBGSLs) is presented. Analytic expressions for the phase and time delay of the FBGSL have been derived and excellent agreement is found between their predictions and experimental results for configurations incorporating uniform-period and chirped-period gratings. For symmetrical grating structures, it is found that the FBGSL time delay response is similar to that of the incorporated grating; with asymmetrical gratings, the FBGSL response is quite different. It is shown that wavelength-division-multiplexing filters exhibiting near-zero dispersion characteristics can be implemented using FBGSLs.

Keywords

Bragg gratings; band-pass filters; delays; optical fibre dispersion; optical fibre filters; wavelength division multiplexing; analytic expressions; asymmetrical grating structures; chirped-period gratings; fiber Bragg grating-based Sagnac loops; multichannel optical bandpass filters; near-zero dispersion characteristics; phase response; symmetrical grating structures; time delay characteristics; uniform-period gratings; wavelength-division-multiplexing filters; Band pass filters; Bragg gratings; Chirp; Delay effects; Fiber gratings; Optical fiber filters; Optical filters; Photonics; Sagnac interferometers; Wavelength division multiplexing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2002.1021991

Filename

1021991