Interferometric measurement system with optical fibre and inertial guidance or navigation system including such an interferometric measurement system
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United States of America Patent
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Dec 13, 2016
Grant Date -
May 14, 2015
app pub date -
May 15, 2013
filing date -
May 16, 2012
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Abstract
A fiber optic interferometric measurement system includes a light source; first and second optical transmission elements; first and second Sagnac-ring interferometers, respectively, including first and second fiber optic coils, and, respectively, having lengths L1 and L2; and first and second individual integrated optical circuits, respectively, connected to the first and second optical transmission elements, and to the two ends of the first and second optic coils, respectively. The interferometric system includes a multiple integrated optical circuit integrating, on a single substrate, the first and second individual integrated optical circuits, and the difference Δl between the optical length of the first optical transmission elements and the optical length of the second optical transmission elements is higher than the maximum of ΔNb1×L1 and ΔNB2×L2, in which ΔNb1 and ΔNb2, respectively, are the group birefringence index difference of the first and second fiber optic coils, respectively.
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