Characterization of the Birefringence in Fiber Bragg Gratings Fabricated With an Ultrafast-Infrared Laser

Author

Lu, Ping ; Grobnic, Dan ; Mihailov, Stephen J.

Author_Institution

Commun. Res. Centre Canada, Ottawa, Ont.

Volume

25

Issue

3

fYear

2007

fDate

3/1/2007 12:00:00 AM

Firstpage

779

Lastpage

786

Abstract

The changes of birefringence in Type I-infrared (Type I-IR) and Type II-IR fiber Bragg gratings induced by an ultrafast-IR laser in SMF-28 fibers are examined after and/or during grating inscription. The gratings are then annealed at increased temperatures up to 800 degC, and their polarization properties are monitored. It is shown that the birefringence in Type I-IR gratings inscribed in hydrogen (H₂)-loaded fibers is small (~10^-6) and can be decayed at room temperature, while the birefringence in Type I-IR gratings inscribed in non-H₂-loaded fibers is relatively higher (~10^-5) and shows strong dependence on the polarization of the IR laser beam. It has the same annealing resistance as the induced index. For Type II-IR gratings, the birefringence is an order of magnitude higher than in Type I-IR gratings (~10^-4) and shows strong temperature variation during annealing

Keywords

Bragg gratings; annealing; birefringence; high-speed optical techniques; laser materials processing; optical fibre fabrication; optical fibre polarisation; optical fibre testing; Type I-IR fiber Bragg gratings; Type II-IR fiber Bragg gratings; annealing; birefringence; polarization; Annealing; Birefringence; Bragg gratings; Fiber gratings; Fiber lasers; Hydrogen; Laser transitions; Monitoring; Optical fiber polarization; Temperature; Birefringence; fiber Bragg gratings; ultrafast infrared (IR) laser;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2006.889662

Filename

4147728