An integrated optical frequency modulator has been developed for a fibre-optic gyroscope using the frequency modulation method. A low insertion loss of 14 dB, which enables a 10−6 rad/s sensitivity, was obtained by realising low coupling loss between the single-mode fibre and titanium-diffused LiNbO3 slab waveguide.
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Shimizu et al. (1986) studied this question.
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