INTERFEROMETRIC MEASUREMENT SYSTEM WITH OPTICAL FIBRE AND INERTIAL GUIDANCE OR NAVIGATION SYSTEM INCLUDING SUCH AN INTERFEROMETRIC MEASUREMENT SYSTEM

摘要

The present invention relates to an optical fibre interferometric measurement system with comprising a light source; a first optical transmission means and a second optical transmission means; first and second Sagnac-ring interferometers, respectively, comprising first and second coils of optical fibre, and ,respectively, having the lengths of L₁ and L₂,; and first and second individual integrated optical circuits, respectively, connected to the first and second optical transmission means, as well as to the two ends of the first and second coils of optical fibre, respectively. According to the invention, the interferometric system comprises a multiple integrated optical circuit integrating, on a single substrate, the first individual integrated optical circuit and the second individual integrated optical circuit, and the difference M between the optical length Δl of the first optical transmission means and the optical length l₁ of the second optical transmission means is higher than the maximum of ΔNb₁ x L₁ and ΔNb₂ x L₂, in which ΔNb₁ and ΔNb₂, respectively, are the difference in the group birefringence index of the first and second coils of optical fibre, respectively.