A fiber optic sensing coil formed in a polarization-maintaining optical fiber has two optical fiber leads extending therefrom. A multifunction integrated optics chip linearly polarizes optical signals input to the sensing coil. Fiber optic leads formed of polarization-maintaining optical fiber extend...http://www.google.de/patents/US5598489?utm_source=gb-gplus-sharePatent US5598489 - Depolarized fiber optic rotation sensor with low faraday effect drift
