Coherent backscatter in optical fibre gyroscopes
Abstract
The effects of correlated coherency effects between two laser beams in a fiber optic gyroscope are examined analytically. Backscatter in optical fibers results from the absorption of laser energy by the fiber molecules, producing oscillating dipoles which release the energy at the frequency and polarization of the absorbed energy. The efficiency of the process is governed by the closeness of the incident energy to the natural mode of the dipole, i.e., the scatterer. The energy released by scattering can interact within the optic fibers, causing heating or scattered radiation. Coherent backscatterer changes the fiber optic gyroscope into a four-beam interferometer. Phase modulation techniques are a means of eliminating or significantly reducing the coherent backscatter.
- Publication:
-
OFS 1984 - International Conference on Optical Fiber Sensors
- Pub Date:
- 1984
- Bibcode:
- 1984ofs..conf..317G
- Keywords:
-
- Backscattering;
- Coherent Scattering;
- Fiber Optics;
- Instrument Errors;
- Light Scattering;
- Optical Gyroscopes;
- Rayleigh Scattering;
- Angular Velocity;
- Error Analysis;
- Interferometers;
- Laser Gyroscopes;
- Optical Fibers;
- Phase Modulation;
- Instrumentation and Photography