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The concept of a fiber optic gyroscope without active control of noise sources or sensitivity has appeal for applications due to the resulting component simplicity and snail volume requirements. Many applications for such a device require only moderate rotation rate capabilities (1-10 deg/hr). The passive gyroscope with a 3×3 fiber coupler demonstrated by Sheem1 exhibited noise levels in the few deg/sec range. We report improvements to this device which resulted in noise levels of ~ 5 deg/hr and a 10 minute drift of ~ 10 deg/hr.
© 1982 Optical Society of America
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