Fabrication of long-period fiber gratings with no harmonics

Author

Grubsky, V. ; Skorucak, A. ; Starodubov, D.S. ; Feinberg, J.

Author_Institution

D-STAR Technol. Inc., Manhattan Beach, CA, USA

Volume

11

Issue

1

fYear

1999

Firstpage

87

Lastpage

89

Abstract

We demonstrate a method to fabricate spectrally clean long-period gratings in optical fibers. Because the photosensitivity of glass is nonlinear, even a sinusoidal light pattern will generate harmonic gratings, and these higher order gratings can cause unwanted resonances. We solve this problem by first measuring the photosensitivity of the glass and then scanning the fiber across an ultraviolet light beam at a variable speed under computer control. The resulting spectra are free from extraneous resonances caused by harmonics of the fundamental grating period.

Keywords

diffraction gratings; optical fibre fabrication; refractive index; sensitivity; computer control; extraneous resonances; fundamental grating period; harmonic gratings generation; long-period fiber gratings; no harmonics; optical fibers; photosensitivity; sinusoidal light pattern; spectrally clean long-period gratings; ultraviolet light beam; unwanted resonances; variable speed; Band pass filters; Fabrication; Fiber gratings; Glass; Optical fiber filters; Optical fiber sensors; Optical fibers; Optical refraction; Power harmonic filters; Resonance;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.736403

Filename

736403