Title :
Resonator fiber optic gyro using digital serrodyne modulation
Author :
Hotate, Kazuo ; Harumoto, Michiko
Author_Institution :
Res. Center for Adv. Sci. & Technol., Tokyo Univ., Japan
fDate :
3/1/1997 12:00:00 AM
Abstract :
A resonator fiber optic gyro using digital serrodyne modulation for control the input lightwave frequency is proposed. In the system, phase modulators in an integrated waveguide circuit are used, instead of an acousto-optical modulator (AOM) frequency shifters with bulky shapes. With operating the signal digitally, it becomes easy to track the resonant frequency by the feedback with a higher accuracy. Errors due to nonideal digital serrodyne waveform are analyzed and are shown to be small enough. Performances of this system are experimentally demonstrated, under open-loop and closed-loop operation. The proposed scheme can implement the ways to reduce the noises without increasing the number of optical elements
Keywords :
electro-optical modulation; fibre optic sensors; gyroscopes; integrated optoelectronics; measurement errors; optical noise; optical planar waveguides; optical resonators; phase modulation; acousto-optical modulator frequency shifters; closed-loop operation; digital serrodyne modulation; fibre optic sensors; higher accuracy; input lightwave frequency control; integrated waveguide circuit; nonideal digital serrodyne waveform; open-loop operation; optical elements; phase modulators; resonant frequency; resonator fiber optic gyro; Circuits; Digital modulation; Frequency; Lighting control; Optical control; Optical feedback; Optical fibers; Optical resonators; Optical waveguides; Phase modulation;
Journal_Title :
Lightwave Technology, Journal of
