SNR enhancement of intensity noise-limited FOGs

Author

Rabelo, Renato C. ; De Carvalho, Ricardo T. ; Blake, James

Author_Institution

Inst. de Estudos Avancados/CTA, Sao Paulo, Brazil

Volume

18

Issue

12

fYear

2000

fDate

12/1/2000 12:00:00 AM

Firstpage

2146

Lastpage

2150

Abstract

The signal-to-noise ratio (SNR) of fiber-optic gyroscopes (FOGs) is directly impacted by the optical power coupled to the interferometric circuit. The optical intensity noise produced by the optical broadband source becomes the major component of the total noise at the output when the optical power reaching the detector is more than a few tens of microwatts. This work shows the implementation of a signal processing scheme capable of promoting reduction of the source intensity noise around the proper frequency of birefringent FOG, where the optimum signal demodulation takes place, yielding a better SNR. The total SNR has been enhanced 6.6 dB by means of a 20.4 dB reduction in the noise component associated only with the source intensity noise.

Keywords

birefringence; demodulation; fibre optic gyroscopes; light interferometry; optical noise; optimisation; SNR enhancement; birefringent FOG; fiber-optic gyroscopes; intensity noise-limited FOGs; interferometric circuit; optical broadband source; optical intensity noise; optical power; optical power coupling; optimum signal demodulation; signal-to-noise ratio; source intensity noise; total noise; Circuit noise; Coupling circuits; Gyroscopes; Noise reduction; Optical coupling; Optical devices; Optical interferometry; Optical noise; Optical signal processing; Signal to noise ratio;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.908826

Filename

908826