Gain-flattening filter using long-period fiber gratings

Author

Harurnoto, M. ; Shigehara, Masakazu ; Suganurna, H.

Author_Institution

Yokohama R&D Labs., Sumitomo Electr. Industries Ltd., Yokohama, Japan

Volume

20

Issue

6

fYear

2002

fDate

6/1/2002 12:00:00 AM

Firstpage

1027

Lastpage

1033

Abstract

We propose a novel structure for a gain-flattening filter, in which a conventional long-period fiber grating (LPFG) and a phase-shifted LPFG are written closely. The transmission characteristics are investigated in the case of a closely arranged configuration. For the fabrication of a phase-shifted LPFG, a UV-trimming method to control the amount of the phase shift is examined theoretically and experimentally. Finally, a 67-mm-long LPFG gain-flattening filter designed for an erbium-doped fiber amplifier is fabricated and the measured spectrum is shown

Keywords

diffraction gratings; infrared spectra; optical design techniques; optical fibre fabrication; optical fibre filters; optical fibre testing; LPFG gain-flattening filter; UV-trimming method; closely arranged configuration; coupled mode analysis; erbium-doped fiber amplifier; gain-flattening filter; long-period fiber gratings; optical fibre grating fabrication; phase shift; phase-shifted LPFG; transmission characteristics; Bandwidth; Electromagnetic waveguides; Erbium-doped fiber amplifier; Fabrication; Fiber gratings; Optical fiber filters; Optical fiber polarization; Optical fiber sensors; Optical fibers; Solids;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2002.1018814

Filename

1018814