A nonrotationalty induced differential phase shift is present in fiber-optic rotation sensors if the polarization in the optical fiber is not conserved or controlled. This phase shift is caused by residual birefringence in the optical fiber. It can be quite large and very sensitive to the environment. It has been shown1 that this phase shift can be eliminated by correct use of a polarization analyzer. There still remain environmentally produced amplitude variations. Work is being done in various laboratories to develop polarization conserving fibers and active polarization control to limit these effects.

© 1981 Optical Society of America

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