High-temperature sensitivity of long-period gratings in B-Ge codoped fiber

Author

Xuewen Shu ; Allsop, T. ; Gwandu, B. ; Lin Zhang ; Bennion, I.

Author_Institution

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

Volume

13

Issue

8

fYear

2001

Firstpage

818

Lastpage

820

Abstract

We report an investigation of thermal properties of long-period fiber gratings (LPFGs) of various periods fabricated in the conventional B-Ge codoped fiber. It has been found that the temperature sensitivity of the LPFGs produced in the B-Ge fiber can be significantly enhanced as compared with the standard telecom fiber. A total of 27.5-nm spectral shift was achieved from only 10/spl deg/C change in temperature for an LPFG with 240-μm period, demonstrating a first ever reported high sensitivity of 2.75 nm//spl deg/C. Such an LPFG may lead to high-efficiency and low-cost thermal/electrical tunable loss filters or sensors with extremely high-temperature resolution. The nonlinear thermal response of the supersensitive LPG was also reported and first explained.

Keywords

boron; diffraction gratings; fibre optic sensors; germanium; optical fibre fabrication; optical fibre filters; optical fibre losses; optical tuning; sensitivity; spectral line shift; thermo-optical effects; 240 mum; B-Ge codoped fiber; B/sub 2/O/sub 3/-GeO/sub 2/; extremely high-temperature resolution; fibre sensors; high sensitivity; high-efficiency; high-temperature sensitivity; long-period fiber gratings; long-period gratings; nonlinear thermal response; spectral shift; standard telecom fiber; supersensitive LPG; temperature sensitivity; thermal properties; tunable loss fibre filters; Bragg gratings; Erbium-doped fiber amplifier; Fiber gratings; Filters; Laser tuning; Optical fiber sensors; Photonics; Resonance; Telecommunication standards; Temperature sensors;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.935814

Filename

935814