interferometer has optical fiber has a high torque pmd in diet, gyroscope has optical fiber (fog) has a high pmd and inertial navigation system comprising such a gyroscope

摘要

The present invention relates to an optical fiber interferometer comprising a wide band optical source (1) having a decoherence time τ, a coil comprising n turns of an optical fiber (5) of length l of the optical means are adapted to separate the incident beam in a first and second beams respectively coupled to a first and second ends of the fiber (5) so that the first beam travels through the optical fiber according to a first direction and the second beam travels through the optical fiber in a direction against - propagative and a detector (6) adapted to detect the intensity of the output beam. According to the invention, the optical fiber is an optical fiber with a high dispersion of the polarization modes (pmd), the length l of the coil of optical fiber is greater than twice the length of the correlation of the fiber, l 2.l so that the fiber is in the speed of pmd coupled and the differential group delay (dgd) of propagation between two orthogonal polarization states that has accumulated on the length l of the fiber is greater than the time of the decoherence of the source dgd τ .