Integrated optical frequency modulator for fibre-optic gyroscope using frequency modulation method

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.