Frequency-shifted multiwavelength FBG laser sensor

Author

Yamashita, Shinji ; Baba, T. ; Kashiwagi, Ken

Author_Institution

Dept. of Frontier Informatics, Univ. of Tokyo, Japan

fYear

2002

Firstpage

285

Abstract

We propose and demonstrate a novel frequency-shifted FBG (fiber Bragg grating) laser sensor system. It is composed of an EDFA (erbium-doped fiber amplifier) broadband light source, 3-FBG array, single mode fiber, circulator, acousto-optic modulator (AOM) and an output 3dB fiber coupler. The frequency-shifted feedback by the AOM allows the laser to operate at multiwavelength at room temperature. Compared to a conventional passive system, the optical signal power and SN ratio were enhanced by 20.1 dB, and 17.0 dB, respectively, and the linewidth was reduced to 1/5.3.

Keywords

Bragg gratings; acousto-optical modulation; fibre optic sensors; laser feedback; optical circulators; optical fibre amplifiers; 20 degC; AOM frequency shifted feedback; EDFA; FBG array; SN ratio; acousto-optic modulator; broadband light source; circulator; erbium-doped fiber amplifier; fiber Bragg grating; fiber optic coupler; frequency-shifted multiwavelength FBG laser sensor; linewidth; optical signal power; room temperature multiwavelength laser operation; signal to noise ratio; single mode fiber; Bragg gratings; Erbium-doped fiber amplifier; Erbium-doped fiber lasers; Fiber gratings; Frequency; Laser feedback; Laser modes; Optical fiber couplers; Optical fiber sensors; Optical modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Optical Fiber Sensors Conference Technical Digest, 2002. Ofs 2002, 15th

Conference_Location

Portland, OR, USA

Print_ISBN

0-7803-7289-1

Type

conf

DOI

10.1109/OFS.2002.1000558

Filename

1000558