Patent
Resonator fiber optic gyroscope (rfog) with reduced bias error from high order spatial modes
TLDR
In this paper, multiple resonator fiber optic gyroscope configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors.Abstract:
Multiple resonator fiber optic gyroscope (RFOG) configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors. The resonator comprises at least a loop fiber, either two or more in/out coupling elements, and connectors that link elements into a circulating loop. Directional elements may be used to separate output light from input light in some of the embodiments. In all embodiments, mode filters are placed in the resonator to guarantee that the light reaching the photodetector is filtered by at least one mode filter in the resonator at least once. The mode filters may contain both spatial mode filters (such as single mode fibers or waveguides) and polarization mode filters (such as polarizing elements) so that both spatial and polarization mode filtering can be implemented simultaneously.read more
Citations
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Patent
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Patent
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TL;DR: In this paper, the authors describe a resonator fiber optic gyroscope (RFOG) that includes an optical fiber, one or more optical filters that suppresses the noise light in the resonator, and variable optical attenuators (VOAs) that can adjust the loss with fast response, and optical gain elements that provide amplification of light to offset part of the losses.
Patent
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TL;DR: In this paper, a system for a resonant fiber optic gyroscope with a polarizing crystal waveguide coupler is described, where the first and second waveguides are polarized to guide light having a polarization state aligned to the first crystal lattice axis, and the second waveguide and the sensing coil are coupled into a resonator configuration forming a ring resonator.
References
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Patent
Optical resonator gyro and method for reducing resonance asymmetry errors
TL;DR: In this article, a ring resonator has a hollow core optical fiber coil and optical elements that are selected and/or oriented to reduce stray light that may be present in input light beams introduced to the ring resonators.
Patent
Monomode optical fiber ring interferometric device with semiconductor diode as light energy emission-reception/amplification means
Arditty Herve,Herve Lefevre +1 more
TL;DR: In this article, a ring interferometer device is provided comprising monomode optical fiber, a radiation separator and a mode filter coupled optically to a coherent light source, which operates alternately as light emitter and receiver depending on the biasing.
Patent
RFOG rotation rate error reducer having resonator mode symmetrization
TL;DR: An error reducer for reducing rotation rate errors, arising because of polarization modes coupling and differing polarization modes characteristics associated with a coiled optical fiber in a rotation sensor, by causing an electromagnetic wave source to direct electromagnetic waves propagating in one of said opposing directions to oscillate in frequency value between frequencies occurring in adjacent opposite polarization mode resonances of those waves is presented in this paper.
Patent
Method for reading out rotation rate with a passive optical resonator
TL;DR: In this article, a rotation rate readout method employing a passive optical resonator was proposed, where the ring resonator is operated at approximate resonance in reflection and rotation rate-dependent phase shifts are detected, in particular as first harmonics, in the resonator.
Patent
Fibre optic gyroscopes
TL;DR: In this paper, a fiber optic gyroscope including a fibre optic loop, a radiation source for generating a broadband signal, splitting means for splitting radiation from the source into two components and inserting them into the loop in clockwise and counter clockwise (CCW) directions, recombining means for recombining the components interferometrically to give an indication of rotation rate of the loop, characterized in that there is further amplification means for amplifying both components travelling within the loop.