Title :
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
fDate :
10/1/1992 12:00:00 AM
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;
Journal_Title :
Lightwave Technology, Journal of
