A pseudo-heterodyne fiber optical gyro, using integrated optics

Author

Stubbe, Raoul ; Edwall, Gunnar ; Bengt, S. ; Svahn, Lars

Author_Institution

R. Inst. of Technol., Stockholm, Sweden

Volume

10

Issue

10

fYear

1992

fDate

10/1/1992 12:00:00 AM

Firstpage

1489

Lastpage

1498

Abstract

A hybrid fiber-optical gyro using a novel scheme for pseudo-heterodyne detection is presented. The large bandwidth of integrated optical phase modulators allows for the use of a triangular-wave for dynamical biasing of the interferometer, while still being able to choose the modulation frequency to be the eigenfrequency of the fiber-loop. It is shown that this, together with the use of a dual-channel approach, minimizes both bias and scale factor errors. It is proposed that the fourth harmonic can be used to keep the modulation index of the applied triangular-wave phase modulation at the correct height and thus guarantee a good scale factor linearity

Keywords

demodulation; fibre optic sensors; gyroscopes; integrated optics; light interferometers; optical modulation; phase modulation; applied triangular-wave phase modulation; bias factor errors; dual-channel approach; dynamical biasing; eigenfrequency; fourth harmonic; integrated optical phase modulators; integrated optics; interferometer; large bandwidth; modulation frequency; modulation index; pseudo-heterodyne detection; pseudo-heterodyne fiber optical gyro; scale factor errors; scale factor linearity; triangular-wave; Dynamic range; Frequency; Integrated optics; Optical fibers; Optical interferometry; Optical mixing; Optical modulation; Optical sensors; Optical signal processing; Phase modulation;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.166794

Filename

166794