Fiber optic gyroscope sensing loop doubler

Details Fiber optic gyroscope sensing loop doubler Fiber optic gyroscope sensing loop doubler

2006-04-25

2006-04-25

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

By light interference

Rotation rate

Reexamination Certificate

active

07034946

ABSTRACT:
A fiber optic ring interferometer, such as an interferometric fiber optic gyro (IFOG), with a sensing loop doubler. The IFOG device includes a light source, a circulator in optical communication with the light source and a photo diode, an integrated optical chip (IOC) capable of splitting light emitted from the circulator into two paths each of which is capable of being modulated, the IOC further being capable of combining light from each of the two paths when light travels in a direction towards the circulator, a fiber coil, and a polarization maintaining (PM) combiner/splitter disposed in between the IOC and the fiber coil. The PM combiner/splitter operates to send light through the fiber coil a first time in a first polarization state and to subsequently send the same light a second time through the fiber coil in a second orthogonal polarization state, whereby light travels twice the distance compared to a single loop IFOG device and, as such, effectively doubles the LD product.

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Herdman, C.T., Fiber-Optic Gyroscopes, Scientific Honeyweller, Honeywell's Corporate, Minneapolis, MN, USA, 1996, pp. 88-95.

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